text:
Marta Oliva Solé
CC-BY-NC-ND • PID_00184141 Data Management
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CC-BY-NC-ND • PID_00184141 Data Management
Introduction............................................................................................... 5
Objectives..................................................................................................... 6
3. Logging Recovery............................................................................... 17
3.1. Logging Recovery Manager Policies ............................................ 17
3.2. Steal/No Force Policy .................................................................. 18
3.3. No Steal/No Force Policy ............................................................ 28
3.4. Steal/Force Policy ........................................................................ 29
3.5. No Steal/Force Policy .................................................................. 30
3.6. Logging Recovery Using the Shadowing Strategy ...................... 30
4. Media Recovery................................................................................... 32
Summary...................................................................................................... 46
Self-evaluation............................................................................................ 47
Answer key.................................................................................................. 48
CC-BY-NC-ND • PID_00184141 Data Management
Glossary........................................................................................................ 49
Bibliography............................................................................................... 50
CC-BY-NC-ND • PID_00184141 5 Data Management
The main objective of this module is to introduce the data management com-
ponent. Specifically:
5. Learn how the behaviour of the data manager affects recovery mecha-
nisms (logging and media recovery).
During the normal use of a database (DB), a number of situations can occur
that can lead to the loss of stored data. The most common of these are directly
related to the transaction execution process, although others are caused by
system failures or errors in storage devices.
The most common type of system failure is when the computer's power supply is shut
down. You will almost certainly have had a power outage while creating a document on
more than one occasion. The first thing we do is to think about the last time that we
saved our work and then estimate how much information we have lost. The same thing
applies when the power goes off while we are performing a transaction to pay money
into our bank account. Obviously, the transaction could not be completed and we are
left wondering which balance the bank's database has recorded for our bank account.
Other times, we find, for example, that there is no way to read a document that we had
previously saved. In this case, we can say that there is an error in the storage device. This
can happen with any storage device on which a database is stored.
We already know what a transaction is and what its properties are. In addi- ACID properties of
tion, read-only transactions are not relevant to the data manager, given that transactions
they do not change the contents of the database. Thus, whenever this module The ACID properties of trans-
mentions transactions, it refers to transactions that have made at least one actions are:
• Atomicity
change in the database (in short, read-write transactions). In this section, we • Consistency
• Isolation
will see how the atomicity and the durability properties require a series of ac-
• Durability
tions to be carried out in certain circumstances in order to make sure that the
database contains accurate information:
are used to deal with problems caused by hardware failures. To describe both
logging and media recovery techniques, we will use the general term recovery
The data�manager, available in all DBMS, must deal with any read and/
or write operations made to the DB. It is also responsible for executing
the actions ensuring that the DB information is correct (logging and
media recoveries) in the simplest, quickest and most automated way
possible, avoiding human intervention when possible.
To allow the data manager to correctly and automatically perform the actions
to ensure that the database is correct, redundant data must be stored. The
elements allowing us to store information in such a way that the database
can be recovered are, firstly, the log and backups, and, secondly, an identical
copy or mirror of the DB so that, when it is not possible to access the original
copy, we can work on the mirror copy.
CC-BY-NC-ND • PID_00184141 9 Data Management
The data manager uses a buffer pool because, as you know, it helps speed up
the process, thereby improving efficiency. Typically, the operating system is
responsible for reading and writing to the buffer pool. Given its importance
in the efficiency of recovery techniques, the DBMS and, more specifically, the
data manager is responsible for its handling through the buffer manager.
The buffer pool used by the data manager is designed to ensure recovery.
Hence, the smallest unit of information that we can store in it is a disk page of
the database. Given that a set of buffer slots is available to us, we can maintain
a collection of disk pages in the buffer pool.
Figure 1
To determine which disk pages are in the buffer, we have a directory. Figure
1 shows how each directory entry contains the address of the disk page and a
pointer to the position of the buffer slot at which the disk page is stored. In
addition, linked to each buffer slot, we will have:
CC-BY-NC-ND • PID_00184141 10 Data Management
a) A bit used to indicate whether the contents of the buffer slot have changed. Dirty bit
This is referred to as a dirty�bit. If there is no change, the bit will remain at 0,
This bit is called a dirty bit be-
while we will switch it to 1 if changes have been made. cause it is considered that the
physical page is dirty (invalid)
and needs to be changed be-
b) Another bit that allows us to keep the page in the buffer slot as though we cause a modification has been
were pinning it down in order to keep it there without flushing until we wish
to do so. This bit is called pin/unpin bit. We will switch this bit to 1 whenever
we want to pin the page to the buffer slot and set it to 0 when we want to
unpin it. By being able to pin and unpin a page in the buffer slot, we ensure
that the read/write operations are atomic since we avoid the flushing of the
buffer slot contents while the operations are being executed.
The buffer manager provides the fetch and flush operations. The fetch
operation reads a page of the DB and loads it in the buffer pool. On the
other hand, the flush operation stores the content of a page, located in
the buffer pool, in the DB.
In the procedure for the flush operation, shown below, we must indicate the ID
of the page to remove from the buffer pool, considering that the page cannot
be pinned, i.e. the pin/unpin bit must be 0 in order that the procedure can
be performed.
if dirty(p) = 1 then
w := content(p);
write_page (p, w);
dirty(p) := 0;
update_directory(p, 0);
The first thing it does is to ensure that the page is stored correctly on the
device where the DB is stored. So, if the dirty bit indicates that the page has
been modified (the dirty bit is equal to 1), a write_page operation is performed,
indicating that, from that point, the page is no longer changed (the copy in the
buffer slot and the copy on the storage device are the same). To complete the
procedure, the directory entry corresponding to the buffer slot that contained
the flushed page is updated to show that there is no DB page in that buffer
slot (the page ID is set to 0), as well as the dirty and the pin/unpin bits. From
this point, the buffer slot is available to fetch another page.
if search(0) = 0 then
<choose a buffer slot b according to LRU or FIFO>;
read_page (p, w);
update_directory (0, p);
content(p) := w;
Firstly, a free buffer slot must be found, bearing in mind that free buffer slots The LRU and FIFO
have 0 as their page ID. If there is none available, a buffer slot that can be techniques
flushed (using the LRU or FIFO technique) is chosen among the buffer slots The LRU acronym stands for
that do not contain pinned pages. Once a free buffer slot is available, the page Least Recently Used.
The FIFO acronym stands for
with the given page ID is physically read. The directory entry corresponding First In, First Out.
to a free buffer slot is then updated to indicate the ID of the page that was just
read and, finally, the page contents are stored in the buffer slot.
Note that whenever a page is fetched, the DB has to be read; however, when a
page is flushed, it is not always necessary to write the DB. The writing is only
performed in the DB if the page has been changed in the buffer pool.
It is important to note that a page can be flushed using two different strategies,
depending on the data manager. Some data managers maintain more than
one version of each page on the storage device, while others only keep one. If
the data manager has a single version of each page in the storage device, each
update will overwrite the page, which is stored in the same location of the
original storage device. Thus, the information it contained before the change
was made is lost. This method is called in-place�updating. If the data manager
maintains different versions of a page in the storage device, it will not be
necessary to overwrite the old version of the page with each update; instead,
a new position can be found on the storage device. This technique is referred
to as the shadowing�technique because each old version of a page is called
a shadow.
CC-BY-NC-ND • PID_00184141 12 Data Management
Figure 2
Given the importance of these two managers, we will devote section 3 of this
module to the logging recovery manager and section 4 to the media recovery
2.3. Log
The log is a component that is essential to the data manager operation, pro-
vided that the data manager uses the in-place updating strategy to flush pages.
The log is used for the storage of information about performed changes
so that the recovery manager can restore a consistent state of the DB. The log can also be called jour-
CC-BY-NC-ND • PID_00184141 13 Data Management
By checking the log, we should be able to determine the last committed value
of data. There are two ways of storing this information in the log:
2) Instead of storing the value, we save the description of the high-level oper- Example of an entry in a
ations performed on the data; hence we have a logical�log. logical log
All physical logs must have the necessary information to undo the changes
made by transactions that have not committed. This information (named be-
fore�image) corresponds to the value of the data before it was modified by
the transaction.
The physical log must also contain the information needed to redo the
changes of committed transactions that were not stored in the DB. In this
case, the information (known as after�image) corresponds to the value of the
updated data.
Thus, besides the information shared with the other entries stored in the log,
any entry corresponding to an update operation also includes the ID of the
page that has been changed, as well as its before and after images.
CC-BY-NC-ND • PID_00184141 14 Data Management
To ensure correct log entries, the recovery manager follows the write-ahead
logging protocol (WAL).
In a similar way, this protocol does not allow the commit operation of a trans-
action to be completed until the log contains the entries for all of the opera-
tions performed by the transaction.
Given the importance of maintaining the order in which the changes have
been made, sequential files are the best storage option. The sequential file that
implements the log has a seemingly unlimited capacity. However, given that
no storage device has an unlimited capacity, the file has assigned a limited
capacity and a link from the bottom of the file to the top is added allowing us
to continue adding entries from the begining of the file once its end is reached.
In addition, to guarantee availability of the log (any file can contain errors),
two copies are usually stored and regular backups are made.
2.3.4. Checkpointing
Given that log entries are being written continuously and the sequential file
that maintains the log is regularly overwritten, we should think about the
a) If entries are overwritten when the capacity allocated for the file that im-
plements the log has been exceeded, what happens with the lost information?
b) If the log entries are stored from the start of the operation of the DB, if it is
necessary to restore a correct (or consistent) state of the DB, how much work
will the data manager have to do and how long will this take?
The problems posed in these questions can be solved with the inclusion in
the log of checkpointing entries.
CC-BY-NC-ND • PID_00184141 15 Data Management
2) Flushing of all changed buffer slots is forced (these buffer slots have their
dirty bit set to 1 in the directory) to the external device where the database
is stored.
With this checkpointing method, the DB contains the last committed values
of the transactions that were being executed during checkpointing. Hence,
the method is also known as commit�consistent�checkpointing. Note also
that all log entries made before the checkpointing can be ignored in the event
of software failure (i.e. logging recovery).
In some systems, especially those overloaded, waiting for transactions comple- Action
tion has the disadvantage of requiring too long a waiting time (during which
Remember that the term ac-
the system is inoperative), from the point where the execution of new trans- tion is used to refer to an el-
actions is no longer accepted to when it is resumed. Hence, instead of trans- ementary operation on the
database that can be found in
action consistent checkpointing, some systems use action-consistent�check- a transaction.
In the following sections of this module, we will learn how the logging and
media recovery managers use the log to recover the database when necessary.
CC-BY-NC-ND • PID_00184141 17 Data Management
3. Logging Recovery
Specifically, the operations offered by the logging recovery manager to the Sending operations to the
concurrency manager are: read, write, commit and abort. There is also a restart data manager
operation, which runs automatically whenever the system is restarted (after The concurrency manager
a crash, for example). sends the operations to the da-
ta manager in such a way that
guarantees the seriability of
transactions executed concur-
The logging recovery manager executes each operation atomically. It uses the rently.
buffer pool, through the buffer manager, to improve the efficiency of both
reading and writing operations, although not all logging recovery managers
use the buffer pool in the same way.
Depending on how the buffer slots are assigned to transactions, and depend- Allocation of buffer slots
ing on when the stored pages are flushed from the buffer slots to the storage to transactions
device where the DB is saved, we can distinguish between different logging We can find out which buffer
recovery manager policies: slots were assigned to a
transaction if we scroll back
through the log. Another op-
tion is to have the logging re-
1) If the logging recovery manager shares the buffer pool among all active covery manager buffer main-
tains a list of assigned buffer
transactions, such that each buffer slot is assigned to any transaction when slots for each transaction.
needed, the logging recovery manager will need to work in steal policy. This
policy is so called because any transaction allows any of the buffer slots that
were assigned to it to be taken when another transaction needs them, even
when the transaction is still active. Thus, in this policy, pages are never pinned
in the buffer pool (i.e. the pin/unpin bit will always be set at 0).
2) The logging recovery manager can also maintain (pin) all the pages that a
particular transaction requires during its execution in the buffer pool. In this
case, the logging recovery manager runs in no� steal policy, since no other
transaction can take the buffer slots occupied by another active transaction.
3) If the logging recovery manager forces flushing all buffer slots assigned to
a particular transaction at the moment that it is committed, then the logging
recovery manager will run in force policy.
CC-BY-NC-ND • PID_00184141 18 Data Management
4) When the logging recovery manager does not force flushing of the buffer
slots assigned to a committed transaction, the logging recovery manager poli-
cy is no�force. In this policy, each buffer slot is flushed only when it is required
in order to fetch a new page.
a) In no steal policy, it is impossible to flush a buffer slot that has been modi-
fied by a non committed transaction, except for buffer slot flushings triggered
by the addition of an action-consistent checkpointing entry. This ensures that
it will not be necessary to undo changes prior to the last checkpointing entry.
c) By forcing the flushing of buffer slots, we ensure that the changes made by
committed transactions are reflected physically in the database at the point
of their commit. This ensures that it will never be necessary to redo changes
made by committed transactions when the logging recovery manager uses the
force policy.
d) If the logging recovery manager does not force flushing the buffer slots
changed by a committed transaction, changes may be lost if, for example, the
system crashes. In the no force policy, we must anticipate the need to redo
changes performed by committed transactions that have been lost.
f) The no force policy allows buffer slots to be flushed according to the need
to fetch new pages. Therefore, unnecessary flushings that could have been
caused by the force policy are avoided, given that the number of input/out-
put operations is also minimised. It may occur that, when the execution of
a transaction begins, it requires the pages modified by a transaction that has
just previously committed.
Logging recovery managers that run in a steal/no force policy, despite requir-
ing both undo and redo mechanisms, are the most common type in DBMSs.
Despite the complexity, this policy is the one that uses the resources most
CC-BY-NC-ND • PID_00184141 19 Data Management
As it has been mentioned throughout this module, we assume that the buffer
manager flushes the pages using the in-place updating strategy. Note also that
a physical log is used. Similarly, we will consider that checkpointing entries
are action-consistent.
We will now see how the operations offered by the logging recovery manager
to the concurrency manager have to be implemented. This implementation
must be consistent with the chosen policy (steal/no force). Specifically, we will
look at the following operations: read, write, commit, abort and restart.
As shown below in the procedure for the read operation, we simply need to
obtain the contents of the page after ensuring that the page is not currently
available in the buffer slots.
The procedure for the write operation shows that, after ensuring that the page
is fetched in the buffer pool and before the chosen buffer slot for this page
is modified, the entry corresponding to the desired modification is written in
the log according to the write-ahead logging protocol. Note that the log entry
includes the type of action ('u'), the ID of the transaction that submits the
operation (t), the ID of the page being changed (p), the before image (w) and,
lastly, the after image (v). Note that the logging recovery manager also adds
the pointer to the previous log entry of the same transaction.
After the content of a buffer slot is changed, its corresponding dirty bit in
the directory is always updated so that the page is physically stored when the
buffer slot is flushed.
CC-BY-NC-ND • PID_00184141 20 Data Management
Thus, the abort procedure must read the log backward, from the last entry of
the transaction, to the first one, in order to recover all before images of the
pages updated by the aborted transaction. For each updating entry ('u'), we
must ensure that the page (p) is fetched to the buffer pool and we must then
modify the contents of the buffer slot containing the page (p) with the before
image ('w') read from the log. It is essential to set the dirty bit for the buffer
slot containing the page (p) to 1 so that the value is physically stored when
the page will be flushed. Finally, the procedure will write in the log that the
transaction (t) aborted ('a').
read_log_backwards('u', t, p, w);
while records_remain_in_log ('u', t) do
if search(p) = 0 then fetch(p) endIf
content(p) := w;
dirty(p) := 1;
read_log_backwards('u', t, p, w);
write_log('a', t);
Figure 3
a) read(T1,P1,v1)
b) write(T1,P1,8)
c) read(T3,P5,v3)
d) write(T3,P5,1)
e) read(T1,P2,v1)
f) read(T2,P3,v2)
g) write(T2,P3,29)
h) abort(T1)
i) read(T3,P8,v3)
j) write(T3,P8,17)
k) read(T2,P2,v2)
l) write(T2,P2,6)
m) read(T4,P20,v4)
n) write(T4,P20,50)
o) commit(T2)
p) auto_checkpointing
q) read(T5,P14,v5)
r) write(T5,P14,7)
s) read(T3,P3,v3)
t) write(T3,P3,18)
u) read(T4,P1,v4)
v) read(T6,P2,v6)
w) write(T6,P2,32)
x) commit(T6)
Figure 4 shows how the different buffer slots have been filled, with directory
updating, and the entries added to the log, taking into account that the log-
ging recovery manager has executed from operation a) to operation e).
CC-BY-NC-ND • PID_00184141 22 Data Management
Figure 4
At this point, in order to execute the operation f), which requires fetching
page P3, we must flush one of the buffer slots. Assuming that the policy is steal
(hence, there are no pinned pages) and that we will use the FIFO technique,
the buffer slot we must flush is the one that contains page P1. Since this page
has been changed, it will be physically stored in the database. We can see the
overall result after executing operation f) in Figure 5.
Figure 5
Simulate the execution of the other operations, from operation g) to operation x), taking
into account that in operation p), as indicated, an action-consistent checkpoint is auto-
matically perfomed. Note that when a transaction is committed, the buffer slots assigned
to it do not have to be flushed (no force policy).
In Figure 6, we can see the final state after applying all the operations. All of
the entries that must be contained in the log are also listed.
CC-BY-NC-ND • PID_00184141 23 Data Management
Figure 6
Log entries
The execution of all the operations, from a) to x), will generate the following log entries:
4. 'a', T1, 1
8. 'c', T2, 6
The restart operation is responsible for restoring a consistent (i.e. correct) state
of the DB after a system failure. Any changes made by transactions that did
not commit and were stored in the database must be undone and the changes
made by committed transactions that were lost must be performed again.
Given its complexity, we will deal with the restart procedure at two levels: In
the first one, we will describe the main actions to be undertaken, while in the
second, we will discuss each action in detail.
CC-BY-NC-ND • PID_00184141 24 Data Management
procedure restart()
var CL: commit_trans_list; AL: abort_trans_list; p: page_id;
w: before_image_page; v: after_image_page;
t: transaction_id; r: entry_type; d: log_position;
buffer_and_transaction_lists_reset ();
undo_to_last_CP_phase ();
undo_complementary_phase ();
redo_phase ();
enter_CP ();
At the first level, we can see that the restart procedure consists of five actions:
4) The redo_phase action corresponds to the redo phase. During this phase,
starting from the last checkpointing log entry, all the changes perfomed by
committed transaction are redone.
5) The enter_CP action is the last task in the restart procedure and consists
of making a checkpointing entry in the log to indicate that the database is
consistent from that point on. The list of active transactions is empty.
procedure buffer_and_transaction_lists_reset()
for each buffer_slot(p) do
dirty(p) := 0;
pin(p) := 0;
update_directory(p, 0);
4) The redo_phase action, begining from the last checkpointing log entry, reads
the log forwards and redoes all changes recorded in the update log entries for
the transactions included in CL.
5) The write_db action is used in the other actions of the restart procedure. It
is responsible for physically storing a given page in the DB.
6) The enter_CP action only records a checkpointing entry in the log. The ac-
tive transaction list is empty, since there is no active transaction in the system.
procedure enter_CP()
var ATL: active_transaction_list;
write_log('cp', ATL);
CC-BY-NC-ND • PID_00184141 27 Data Management
Let us suppose that after operation x) in the previous example, the system crashed. Sim-
ulate the execution of the restart procedure that the logging recovery manager must per-
form in order to restore the system and ensure a consistent DB.
Figure 7
Figure 8
Figure 9
Logging recovery managers that run in no steal/no force need only anticipate
the need to redo the lost changes that correspond to committed transactions.
Given that the no steal policy is used, there will be no need to undo any
changes with the exception of those saved following action-consistent check-
The code associated to the operations offered by the logging recovery manager
to the concurrency manager differs from the ones we looked at the steal/no
force policy in the following ways:
1) The read operation: the main part is the same as for the procedure in the
steal/no force policy, but after fetching the page, it must be pinned (the pin/
unpin bit is set to 1) because it works with the no steal policy.
2) The write operation: if the page has to be fetched, it must also be pinned as
in the read operation. The other difference is that it will not be necessary to
record the before image of the updated page in the log entry because it will
not be necessary to undo changes, unless the action-consistent checkpointing
is used.
3) The commit operation: it is not necessary to flush the buffer slots but they
must be unpinned (the pin/unpin bit for all buffer slots assigned to the com-
mitted transaction must be set to 0). As in the previous policy, the entry must
be recorded in the log.
5) The restart operation: as we have seen, in this policy, we only need to redo
the changes made by committed transaction. Thus, for the five actions that we
learned for the steal/no force policy, the buffer_and_transaction_lists_reset ac-
tion will be the same, for the undo_to_last_CP_phase action, the log will simply
be read backwards until the last checkpoiting in order to identify the trans-
actions that had committed before the crash. The undo_complementary_phase
action will only be necessary if the action-consistent checkpointing is used,
and the other two actions will be identical.
Logging recovery managers that run in steal/force policy only have to undo
the changes performed by transactions that have not committed but which
may have been physically recorded.
The code associated to the operations offered by the logging recovery manager
to the concurrency manager differs from those that we have studied in the
following ways:
1) The read operation is the same as for the procedure in the steal/no force
2) The write operation is the same as for the procedure in the steal/no force pol- Recording of after image
icy except that it will not be necessary to save the after image of the changed
Although the after image is
page in the log, since it will not need to be redone at any time. not needed for logging recov-
ery, it is usually recorded be-
cause of its importance for me-
3) For the commit operation, it is necessary to flush the changed buffer slots dia recovery.
assigned to the committed transaction and then record the corresponding log
entry. Due to the steal policy, it is possible that only a small number of buffer
slots assigned to the transaction must be flushed.
4) The abort operation is the same as for the procedure in the steal/no force
Logging recovery managers that run in no steal/force are not required to undo
or redo changes under any circumstances.
The code associated to the operations will differ from the ones that we have
already seen in the following ways:
1) The read operation is the same as for the procedure in the no steal/no force
policy; thus, after fetching the page, the assigned buffer slot must be pinned
(the pin/unpin bit is reset to 1).
2) The write operation: if it is necessary to fetch the page, it must be pinned Recording of the after
in the same way as for the read operation. It will be necessary to proceed as in image
the steal/no force policy, taking into account the fact that it is not necessary Again, although the after im-
to save the after image of the changed page, since at no time will be necessary age is unnecessary for logging
recovery, it is usually recorded
to redo it. because of its importance for
media recovery.
3) For the commit operation, it is necessary to flush the buffer slots assigned
to the committed transaction and then record the corresponding log entry, as
with the steal/force policy. Note that the buffer slots must be unpinned before
they can be flushed.
Since we must guarantee that flushing will be atomic, the shadowing tech- See also
nique must be used; hence, this policy is not feasible if the buffer slots are
For logging recovery using the
flushed using the in-place updating technique. shadowing technique, see sub-
section 3.6 of this module.
4) The abort operation uses the same abort procedure proposed in the no steal/
no force policy.
5) For the restart operation, the undo and redo phases are innecessary. The
complementary_undo_phase will be executed if action-consistent checkpointing
is applied. The initialisation of the buffer pool structure and the addition of a
checkpointing entry in the log will be required as in the other policies.
The logging recovery mechanisms for the restart procedure that we looked at
in the previous subsections used the log. This structure is essential in systems
based on the in-place updating technique.
We have seen that the other page flushing strategy that can be used by the See also
logging recovery manager is shadowing, and we have also seen that this strat-
Read back over subsection
egy facilitates the tasks of the logging recovery manager. 2.1.2 of this module to remind
the shadowing strategy.
CC-BY-NC-ND • PID_00184141 31 Data Management
With the shadowing strategy, a different physical space is always used to store Usefulness of directories
the page after it has been modified (i.e. the page is not overwritten) and the
With directories, we can find
old value of the changed page is maintained. Hence, different directories can out the state of the database
be used to determine the different states of the DB. before the execution of a
transaction began; moreover,
with another directory, we can
indicate the new state of the
If we assume that changes are always physically stored, there is no need to database after the execution of
the transaction.
redo any lost changes as a result of a crash. Moreover, rejecting the changes
made by a transaction that was unable to commit is as easy as rejecting the
new directory and new pages generated as a result of the execution of the
transaction and considering the shadow directory and pages as valid instead.
In this case, then, we can guarantee that the logging recovery mechanism
does not need to undo or redo. The only complication with this technique is
locating enough free space for the storage of new pages and the new directory
when necessary, and freeing up the space that they occupy when they need
to be rejected. Whenever a transaction commits, the old pages addressed by
the shadow directory can be rejected.
CC-BY-NC-ND • PID_00184141 32 Data Management
4. Media Recovery
Both the log and backups are essential for media recovery.
When a total or partial loss of the DB is detected due to the failure of a hard-
ware component, we must follow the steps below to recover the lost data:
2) Locate the backup made immediately before to the date on which the error Types of backup
occurred, given that this is the copy that contains the most accurate informa-
There are different types of
tion about the database state at the time of the loss. backup:
• Static
• Dynamic
3) Copy the contents of the backup in order to recover the database. • Full
• Incremental
4) In order to complete the media recovery, use the log to redo all the com-
mitted changes performed between the date when the backup was made and
the current date.
This procedure can also be used to correct changes made to the DB that were
later found to be incorrect.
Moreover, entries made prior to a checkpointing that were rejected are not
lost, as they are always kept on log backups to guarantee the availability of all
log entries required for media recovery.
Likewise, in order to guarantee the availability of the data required for media
recovery, if the DBMS does not have a log because it uses the shadowing tech-
nique to flush buffer slots, backups of the shadow pages and directories are
When a DB system has a mirror or secondary copy besides the primary copy of
the database, in the event of an error in the storage device of the primary copy,
we can immediately use the mirror copy without this change affecting users.
We can reconstruct the lost part of the primary copy from the secondary copy.
Although backups may seem unnecessary if we have a mirror, they are often
made in case there are also problems with the secondary copy.
To ensure that the mirror does not have the same problem as the primary
copy, they must be stored on a different device. For each database copy, a log
is also stored on different devices.
During normal database operation, all readings are made to the primary copy.
When a write is recorded, both copies need to be updated to make them iden-
tical. So as not to reduce the response time of the DB, instead of updating
the two copies at the same time, the primary copy is updated first, followed
by the mirror update. Thus, having a mirror increases read capacity but not
write capacity.
CC-BY-NC-ND • PID_00184141 34 Data Management
Given that each site has its own data manager, we can consider that the re-
covery in each local database will be guaranteed by the site itself. However,
this is not enough to ensure the correct execution of a global transaction. To
guarantee the property of atomicity of a global transaction, we must ensure
that all subtransactions of the global transaction either commit or abort.
Taking into account the nature of DDBs, the reasons why a global transaction Distributed systems and
may be unable to complete its execution successfully are related to the prob- communication lines
lems that can arise in two of the basic components of the distributed system: In distributed systems, the sites
sites and communication. If just one site crashes, the global transaction can- process the information while
the communication lines trans-
not complete. Moreover, even if all of the sites forming the DDB may be work- mit this information from site
to site.
ing properly, the problems that can occur in communication (network failure,
long response times, etc.) may make proper communication between sites im-
possible, which will affect the execution of the global transaction. Thus, fail-
ures or errors in DDBs can be classified as:
• Site failure.
• Communication failure with possible network partitioning.
• Message loss.
Given that the underlying protocol of the communications network deals Note
with problems arising in the sending of messages, this section will only look
In this section, only the com-
at other failures and errors. mit, abort and restart opera-
tions are relevant.
There is no difference in the
behaviour of read and write
operations with regard to cen-
tralised DBs.
CC-BY-NC-ND • PID_00184141 35 Data Management
In the event of a site failure, processing will suddenly stop and the content of Note that a local transaction on-
ly accesses local data of the site in
the buffer pool will be lost. Although the site may be recovered through the
which it is being executed.
restart procedure executed by the local data manager, the resulting state of the
subtransactions belonging to global transactions is not the same as the state
of the local transactions1.
From the point of view of the sites that conform the DDB, when one site
crashes, it creates a situation of uncertainty and sites are blocked, given that
these sites do not have any information about whether they can commit or,
alternatively, they must abort the subtransactions of the global transaction
under their control. To deal with these situations, Atomic�Commitment�Pro-
tocols (ACPs) are used.
In the following sections, we will look at the Two-Phase Commit (2PC) and
Three-Phase Commit (3PC) protocols, given that these are the most common
ACP protocols.
Both protocols are based on the premise that any global transaction has a site
that is responsible for its execution. This site is called the coordinator. The
sites that receive a subtransaction (belonging to the global transaction) are
known as participants in the execution of the global transaction. Although
the coordinator knows the identity of the participants and the participants
know the coordinator, the participants do not necessarily know one another.
Note that both the coordinator and the participants have a local log (which,
from the perspective of the global transaction, and taken as a whole, form a
distributed log) in which to write all relevant entries for the ACPs.
CC-BY-NC-ND • PID_00184141 36 Data Management
2) In the second phase, namely the commit� phase or decision� phase, the
coordinator decides how to proceed based on the received responses.
If any of the participants responded that it was not ready or non response is
received after a certain time-out, the coordinator will instruct all participants
to abort the transaction (each participant must abort the subtransaction of
the global subtransaction under its control). However, if all participants indi-
cated that they were ready to commit, then the coordinator instructs the par-
ticipants to start committing.
The algorithm below indicates the actions that must be executed by both the
coordinator and the participants during the execution of 2PC. The actions of
the coordinator are shown with a C, while the actions of the participants are
indicated with a P. Note that relevant entries are written in the log during the
execution of the protocol. Log entries are denoted as records in the algorithm
below. Figure 10 also contains a diagram of this protocol.
CC-BY-NC-ND • PID_00184141 37 Data Management
It is important to note that the protocol shows the behaviour of all sites, as-
suming that there are no failures. Below we explain the behaviour of the co-
ordinator and participants when a failure happens.
The actions carried out during the termination protocol will depend on the
site (whether it is the coordinator or a participant) that initiated the protocol
and its state in the 2PC.
If the coordinator is the site that is waiting and hence initiates the termina-
tion protocol, and it is waiting during the voting phase, the coordinator will
not have the responses from all participants and cannot therefore decide to
commit, although it can decide to abort the global transaction. If, by contrast,
the coordinator is waiting during the commit phase, after the coordinator has
instructed the participants on how to proceed, in the absence of an acknowl-
edgement message, the coordinator will need to re-send the instructions on
how to proceed to the sites that have not responded.
However, when a participant is waiting, the easiest option is to block the site Condition for the
until communication with the coordinator can be re-established and it can cooperative termination
find out how to proceed (see Figure 11). Blocking has a negative impact on
the overall system performance and data availability, and compromises the To use the cooperative termi-
nation protocol, the coordina-
efficiency of 2PC. In an attempt to reduce the time for which a site is blocked, tor must indicate to each par-
ticipant which other sites are
the blocked site can try to contact another participant to find out the decision participating in the execution
made by the coordinator. This initiates the cooperative�termination�proto- of the global transaction.
CC-BY-NC-ND • PID_00184141 39 Data Management
We have already seen that when a site recovers from a failure, the recovery
protocol must be applied (since we must recover not only the local transac-
tions and subtransactions –by means of the restart algorithm– but also the
global transaction). Again, the necessary actions to be performed will depend
on whether the failed site was the coordinator or one of the participants. If the
failed site was the coordinator, when it is restored, the commit process must
be initiated, unless, at the time of the failure, the coordinator was at the 2PC
commit phase and had thus already sent instructions to the participants based
on the made decision. In this case, if after restarting, the coordinator finds that
it has received all of the acknowledgement messages, the global transaction
can be successfully completed. If it does not have all of the acknowledgement
messages, the coordinator must start the termination protocol we saw earlier.
If the site recovering from the failure is a participant, then we must try to
ensure that this participant finishes executing the action that has already been
executed by the other participants, in an independent manner (i.e. without
the need to communicate with the coordinator or another participant again
if it is possible). If the failure occurred before the participant sent its vote on
how to end the global transaction, the site may directly abort the transaction
after restarting, since it was unable to send a reply to the coordinator and
the latter cannot make the decision to commit without the vote of the failed
participant. By contrast, if the participant has already expressed its vote, then
the recovery must take place using the termination protocol seen earlier.
The basic idea of 3PC is to eliminate the uncertainty time for participants that
have voted to commit during the voting phase and are waiting for instructions
from the coordinator on how to proceed. In 3PC, a new phase is incorporated
between the commit-request (or voting) phase and the commit phase (or de-
cision), known as the pre-commit�phase. With this new phase, we ensure that
the two possible final decisions (commit or abort) for the global transaction
are not taken in the same commit protocol state (see figures 12 and 13). Thus,
whenever a participant restarts after a failure, it will know how to continue
based on its state with regard to 3PC at the time the participant failed.
When the coordinator receives the votes from all of the participants, it sends
them a global pre-commit message. A participant receiving the global pre-
commit message already knows that the other participants have voted to com-
mit and inevitably it will have to make its final commit unless it experiences
a failure. Each participant must acknowledge the receipt of the pre-commit
message. Once the coordinator has received all the pre-commit acknowledge-
ment messages, it then sends the global commit message to all participants
(see Figure 12). If some participant voted to abort during the voting phase, the
same procedure as for 2PC would be followed (see Figure 13).
CC-BY-NC-ND • PID_00184141 41 Data Management
The algorithm below indicates the actions that must be executed both by the
coordinator and the participants during the execution of 3PC. Notice how the
relevant entries (denoted as records in the algorithm) are written in the log
here too.
CC-BY-NC-ND • PID_00184141 42 Data Management
Both the coordinator and the participants still have waiting periods. More im-
portantly, however, all operational sites will have been informed of the global
commit decision made by the coordinator thanks to the pre-commit message.
This means that each site can work autonomously even in the event of failure.
As in the 2PC, when time-out expires, the 3PC termination protocol must be
used. If the coordinator is waiting to receive the vote of some participant, it
may decide to abort the global transaction. If the coordinator is waiting to re-
ceive the pre-commit acknowledgement message, it may complete the global
transaction, writing the corresponding entry in the log, and send the commit
message of the global transaction to the participants. If the coordinator does
not receive a message confirming the successful execution of the commit or
abort operations, it can re-send the message with the global made decision to
the sites that have not sent the acknowledgement message.
Again, as with 2PC, recovery protocols are important for 3PC. If the coordi-
nator fails before the commit process is initiated, then it is only necessary to
restart this process. However, if the coordinator fails while waiting for the vote
response or while awaiting the pre-commit acknowledgement message, then
the participants may have chosen a new coordinator to complete the global
transaction. In these cases, when the failed coordinator restarts, it will need to
communicate with one of the participants to determine the final state of the
global transaction. If none of the above apply, the coordinator will have failed
while waiting for the response of the participants to its instructions about the
action to be executed. In this case, once the coordinator has restarted, it will
need to check whether it has all the acknowledgement messages to complete
the global transaction properly; if it does not, it will need to initiate the ter-
mination protocol.
If the failed site is one of the participants, the participant may abort the trans-
action if voting did not take place before the failure. By contrast, if the par-
ticipant failed after the vote was delivered or after the pre-commit acknowl-
edgement message was received, once the restart process were completed, it
would have to contact another participant to find out the final state of the
global transaction. If the participant fails after the order to commit or abort
is executed, given that the participant will have already completed the trans-
action, no further action is necessary.
When a DDB is replicated, either partially or completely, this means that we Note
need to maintain the consistency of the replicas.
Replicas must have exactly the
same content in order to be
In this case, the problem arises when replicas of the same data are located in consistent.
The only two options in a situation like this are to allow or forbid access to
the replicas that have been cut off. Both options have advantages and disad-
vantages. If we allow work on the different replicas with no communication
between the sites where they are located (following an optimistic protocol),
the replicas could end up in an inconsistent state, although obviously the
availability of the data will have increased. If, by contrast, we choose to pro-
hibit access to the replicas in the absence of communication between the sites
where they are stored (following a pessimistic protocol), availability decreases
but we guarantee the data consistency.
CC-BY-NC-ND • PID_00184141 45 Data Management
For the media recovery of a DDB in the event of a hardware failure, we must
use the same techniques as for media recovery in centralised DBs, taking into
account that the sites storing the DB must define their own backup policies.
CC-BY-NC-ND • PID_00184141 46 Data Management
In this module, we have learned how the properties of atomicity and durabil-
ity of transactions highlight the need for recovery techniques to guarantee
database consistency. We have also seen how other problems, such as hard-
ware errors, can cause loss of data, which also makes recovery techniques in-
The recovery manager is the most important subcomponent of the data man-
ager and deals with both logging and media recovery techniques. The purpose
of the data manager is to deal with access operations to the physical database
while ensuring the data consistency.
We have also presented the log. The log contains data that are essential for
both logging and media recovery.
With regard to logging recovery, we have seen the different policies (steal/
no steal and force/no force), being the most common one the steal/no force
We have also studied that media recovery can be done by means of backups
and logs. Another alternative is based on the use of a database mirror.
The problems that can occur in the sites or communication that form a dis-
tributed system show that, although the DBMS of each DB forming the DDB is
able to use local recovery mechanisms, it is possible that a global transaction
cannot be completed. This is why we have studied the 2PC and 3PC atomic
commit protocols.
CC-BY-NC-ND • PID_00184141 47 Data Management
1. In which situations can the total or partial loss of data stored in a DB occur?
4. Which logging recovery manager policy minimises the number of input/output opera-
5. Write an algorithm for the commit operation in a logging recovery manager that works
in no steal/no force policy.
6. How does the restart procedure differ if the transaction-consistent checkpointing is used?
Answer key
1. The data stored in a DB can be lost primarily as a result of a system failure and as a result
of storage device errors.
2. The buffer manager offers two operations. The fetch operation is used to read a physical
page of the DB to a buffer slot. With the flush operation, a page is removed from a buffer slot
and physically stored in the DB if changes have been made.
3. The log is used to store information on the changes made during the execution of transac-
tions. This ensures that we have the necessary information to recover a consistent DB state.
4. Any manager based on the no force policy can minimise the number of input/output op-
erations, since it only flushes the buffer slots when required.
5. We can know which buffer slots were assigned to a transaction if the log is read backwards.
Thus, the algorithm for the commit operation can be written as follows:
Another option would be that the logging recovery manager could maintain a list of buffer
slots assigned to each transaction.
6. With transaction-consistent checkpointing, we can ensure that there was no active trans-
action when the checkpointing was made; we can therefore be certain that when we restart
the system, it will not be necessary to undo the changes recorded before the last checkpoint-
ing (i.e. undo_complementary_phase action is not required).
7. No. Backups are useful for recovering a given state of the database, either due to loss or
because the changes made after a certain time have generated incorrect data. With backups,
we can revert to a correct state prior to the point at which the error occurred.
CC-BY-NC-ND • PID_00184141 49 Data Management
buffer pool Volatile memory that uses the database management system to ensure an
efficient access to the physical database (i.e. the persistent storage).
checkpointing Method that forces the storage of a consistent state of the database and
creates a new entry in the log.
data manager Component of the database management system that ensures an efficient
and correct access to the physical database (i.e. the persistent storage).
fetch Operation performed by the buffer manager that reads a physical page that is loaded
in a buffer slot.
flush Operation performed by the buffer manager that takes a page from the buffer pool
and stores it in the physical database if it has been modified.
force policy Operating policy of the logging recovery manager in which, when a transac-
tion commits, the logging recovery manager forces the flushing of the buffer slots assigned
to the transaction.
in-place updating Technique used when flushing buffer slots to the physical database
that overwrites the involved pages, given that are always stored in the same place.
log Sequential file that records the history of the transactions with the changes they made.
logging recovery Term that covers all mechanisms and techniques for recovering a data-
base, thereby ensuring compliance with the atomicity and durability properties of the trans-
media recovery Term that includes all mechanisms and techniques for rebuilding a data-
base in the event of the total or partial loss of data due to hardware errors.
mirror Secondary copy of a database used to facilitate reading and to rebuild the database
in the event of the total or partial loss of data.
no force policy Operating policy of the logging recovery manager that, when a transaction
commits, does not force the flushing of the buffer slots assigned to the transaction.
no steal policy Operating policy of the logging recovery manager in which the logging
recovery manager does not allow the flushing of a buffer slot while the transaction using
it remains active.
shadowing Technique used for flushing buffer slots to the physical database that searches
for a new space every time a page has to be saved; it therefore keeps the previous page version.
steal policy Operating policy of the logging recovery manager in which the logging re-
covery manager allows the flushing of a buffer slot even though the transaction using it
remains active.
Three-phase commit (3PC) Synchronisation protocol that ensures the global atomicity
of distributed transactions while alleviating the blocking aspect of 2PC in the event of site
failures. In other words, 3PC never requires operational sites to wait (i.e. block) until a failed
site has recovered.
Two-phase commit (2PC) Synchronisation protocol that solves the atomic commitment
problem. It is used in distributed database systems to ensure the global atomicity of transac-
tions in spite of site and communication failures, assuming that a failure will eventually be
repaired and each site guarantees the atomicity of transactions at local level.
Write-ahead logging protocol Protocol that specifies how and when to make log entries.
CC-BY-NC-ND • PID_00184141 50 Data Management
Bernstein, P. A.; Hadzilacos, V.; Goodman, N. (1987). Concurrency Control and Recovery
in Database Systems. Reading (Massachusetts): Addison-Wesley.
Connolly, T.; Begg, C. (2009). Database Systems. A Practical Approach to Design, Implemen-
tation, and Management.(5th edition) Harlow (England): Addison-Wesley.
Elmasri, R.; Navathe, S. B. (2007). Fundamentals of Database Systems (5th edition). Boston
(Pearson): Addison-Wesley.
Garcia-Molina, H.; Ullman, J. D.; Widom, J. (2009). Database Systems. The Complete
Book (2nd Edition). Pearson – Prentice Hall.


text:
2019 IBU WCH in ice hockey: a forecast for the match France – Slovakia on 17 may 2019
Two far the strongest teams from group A will again be ready to meet in face-to-face confrontation at the world Cup in 2019, a year after the last bout. France or Slovakia? Who will extract the most important points this time? If you pay attention to the quotes of the largest bookmakers, the slight advantage has to be on the side of the nominal guests. But it is not so significant. So what will be the outcome in this game?
For nearly a hundred years the Musketeers have not won medals at major international competitions. In the twenty-first century, they're trying to get back among the winners, but yet they managed to become just "average". For example, a year ago at the world championship, they finished sixth in group A with six points. Can France improve their achievement this year?
In the same group for the 2018 world Cup "the knights of the Tatras" was fifth. But their account is almost two times more points than the French, and eleven. So no wonder Slovakia and is now considered by many to be the favorite in their personal battle. The more that the sixteenth may the team of Craig Ramsay will rest while their opponent will need to play a difficult match against the Canadians.
The forecast for the end of the game France – Slovakia
Of the eight head-to-head only once the French managed to cope with the Slovaks. But on account of the "Knights of the Tatra mountains" the seven Victoria produced in the main time. A year ago at the world Cup in Denmark, they were also stronger in the group stage (3:1). That is why our forecast of N2. Most likely, after three periods.
Predictions for all the matches of the ice hockey world championship 2019.
Дата публикации:16.06.2019
Дата публикации:16.06.2019
Дата публикации:16.06.2019
Дата публикации:15.06.2019
Дата публикации:15.06.2019
Дата публикации:14.06.2019
Дата публикации:11.06.2019
Дата публикации:11.06.2019

subset: commoncrawl


text: KTM unveils new race bike Published: 21 October 2003 Updated: 19 November 2014 These are the first pictures of the new KTM LC8 Adventure flat tracker.The 950cc twin was revealed in public for the first time at the Scioto Downs round of the U.S. Flat Track series on October 13 with rider Joe Kopp. The bike was kept in its stock bodywork for the demo laps. When it is raced, the bodywork will be replaced by competition parts.Kopp rode a Harley-Davidson XR750 last season, but has enjoyed the new bike. He said " It's got more motor at the top end than my Harley. " The KTM will also benefit from further development as opposed to the American bike, which is based around a 30-year-old design.There are no plans to mass-market the flat-tracker at the moment, but it would be the ultimate toy if you had enough space in your garden for a dirt oval.Comment on the new KTM race bike on the News discussion board by following the link on the right. By Anonymous Other pages you might like ... NewsArticles VideoVideos Max Biaggi gets measured up for electric speed record attempt Six-time motorcycle world champion, Max Biaggi, has teamed up with Monaco-based electric bike firm,... Thieves brag about stolen motorcycles on Instagram Bike thieves are openly selling stolen vehicles on social media accounts, with some even taunting... Best electric motorbikes of 2019 It's time to take electric motorbikes seriously. In 2016, Germany voted to ban the internal... MCN poll: what era of MotoGP was the best? The Grand Prix paddock celebrated its 70th birthday at the Catalunya Grand Prix. Now called MotoGP,... New videos for learner drivers' biker awareness The DVSA have bolstered their learner driver information with new videos that specifically highlight... Speedway GP Cardiff 2019 details released Round 9 of the FIM Speedway GP series will see the action returning to the Principality... 'We have more smiles per mile at 30mph' - Northern Ningers A biking tour can be a great way to add to your #ride5000miles total, experiencing new places and... New Yamaha MT-07 spied in testing These spyshots show that Yamaha are planning to update its super-popular MT-07, which should... Harley-Davidson look to break into Chinese market Harley-Davidson announced the biggest shake-up in their recent history back in 2018, and they're... Hardcore KTM 790 Adventure R Rally revealed! If you thought KTM's excellent new middleweight adventure bike was nice, but not serious enough –... BMW reveal Vision DC Roadster electric concept BMW have unveiled the Vision DC Roadster – a naked electric concept bike that moves the electric... Video: Ernie Vigil desert racing on Triumph Scrambler 1200 A retro-styled 1200cc Triumph may sound like more of a coffee shop cruiser than an off-road racer,... Roads: Hickman and Harrison launch 2019 Ulster Grand Prix TT 2019 treble winner, Peter Hickman and arch rival, Dean Harrison, the winner of this year's Senior... Prescott Bike Festival is blood bike charity's biggest annual fundraiser The ninth annual Prescott Bike Festival and Hill Climb was a roaring success with a stack of cash... Troy Bayliss gives Ducati MIG-RR e-MTB electric mountain bike approval The new Ducati MIG-RR e-MTB is designed to deliver the best bits of mountain biking without needing... 2019 MCN Sicilian Superbike Shootout Three very special 200bhp-plus superbikes require an equally special stage, so we've brought them to... Go motorcycle racing on a budget with the MZ Experience Run as part of the British Motor Cycle Racing Club (Bemsee), the Chilton Motors MZ Championship is... See the Ducati Streetfighter V4 in action! Ducati have released a video showing their new Streetfighter V4 in action, ridden by Pikes Peak... Indian FTR1200S long-term test - first impressions There's no point in me hiding it but I've been looking forward to Indian's FTR1200S ever since the... MCN's Weekly Wind-on: top stories this week Another week has passed and there's been plenty going on in the world of motorbikes to get excited... Share this article ... Advertisement


text:
COLLIER Jean
Funeral Notice Guest Book
The Cremation Service to honour the life of Jean Collier formerly of Yanchep will be held at PINNAROO Valley Memorial Park Cemetery, WEDNESDAY (5.6.2019), East Chapel at 10:30am.
WA Family Owned
Sign the guest bookOnline until 29 Jun 2019 Keep Online
Keep COLLIER Jean's Guest Book Online
Celebrate the life of your loved one by keeping their Guest Book online. It's a lovely way for family and friends to express their condolences and share memories for the months and years to come. Guests can leave their heart-felt message and even include a photo of a favourite time shared with your loved one.


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Chefs Choice Cash & Carry Food Dist
1051 Utica Ave Brooklyn, New York 11203(718) 342-7800
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The excitement of going into a brand new home loses a number of its excitement once you realize your new pad desperately needs renovations. Especially when the space is yelling for a significant project, like retiling your floors or bathroom and kitchen walls. And particularly especially in the event that you happen to be a renter. That's why you have to know about peel and stick tiles.|}
These tiles can literally change your home without making a dent in your wallet--and also save you a ton of time and effort, too. They are basically like stickers, and are super easy to install yourself. In an interview with Domino, blogger Sara Toufali revealed the steps for a Great peel-and-stick DIY job and dropped some serious understanding --just look at the way they revived her toilet:
"Look for brands which can send samples, which means you can see the way the stickers will look in real life before spending money on a large batch," the blogger informed Domino. "If you are ordering custom dimensions, you most likely won't be able to return them, which means you want to be sure that the stickers are exactly right for your space."
She yells in different strategies and shortcuts for soon-to-be DIY-ers, like how to prep the area and make sure you're getting the ideal dimensions. Peel and stick tiles are primarily used for kitchen backsplashes and bathroom walls--but you may use them on your floor, too.


text:
Dimension Data Blog
Are customers at the heart of your business strategy?
It's an accepted truth that the organisations that will thrive are those who put their customers at the centre of their business strategy - but why?Read blog
Navigating compliance while your data scales
Hybrid storage models including managed storage are essential in ensuring compliance and scale in an age of increasing regulation.Read blog
Technology to support an ambitious climb
Data has changed professional cycling in a whole range of ways. It's changing the viewing experience, the athlete's experience, and management's experience.Read blog
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Using technology to drive performance. What does it take to drive the performance of the first African team to ride in the UCI WorldTour?Read blog
Revolutionising game day for sports fans and operators alike
How Connected Stadiums can give competitive edge in fan experience, profitability, and stadium performance.Read blog


text:
Posted by col3neg on 8 Jan 2019 (10:39 AM). Hosted on the Internet.
Abolishing the 19th Amendment to the Constitution for the sake of personal interests is unbeneficial for the country, says the PAFFREL (People s Action For Free Fair Elections) team on election monitoring. MORE..
24 Jun 2019 (3:30 PM)
A special raid has been carried out at the Gonaketiya rubber estate area in Soragune-Haldummulla by the Haputale Police Special Task Force (STF) officers. MORE..
24 Jun 2019 (1:33 PM)
The launch of the historic final step of expanding Sri Lanka s pre-hospital emergency care revolution to the entire nation took place in Ampara district today (23) under the patronage of the Founder of the 1990 Suwaseriya Ambulance Service, Minister of Economic Reforms and Public Distribution, Dr. Harsha de Silva. MORE..
24 Jun 2019 (1:20 AM)
A strong earthquake struck Monday in Indonesia s Banda Sea, but authorities said there is no tsunami threat. MORE..
24 Jun 2019 (10:50 AM)
Naval personnel apprehended 18 persons engaged in illegal fishing in the sea areas of Back Bay and Upparu in Trincomalee yesterday (22), stated Sri Lanka Navy. MORE..
24 Jun 2019 (1:05 AM)
A group of naval personnel recovered 335.7 kg of Kendu leaves (Beedi Wrappers) in Jaffna, yesterday (June 22), stated the Sri Lanka Navy. MORE..
23 Jun 2019 (4:27 PM)


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South32 Limited (ASX/JSE/LSE: S32; ADR: SOUHY) has entered into an over-the-counter equity forward contract to acquire up to an additional 15 million shares in Arizona Mining Incorporated (TSX: AZ), equivalent to 4.9% of outstanding common shares.
Under the terms of the contract, a third-party financial institution will seek to purchase the shares in the market over a maximum period of 12 months. Trading activity will occur at the financial institution's sole discretion, subject to certain agreed trading parameters. South32 will settle the contract in full in advance of commencing the program. The final cost is to be determined on completion and will be based on the daily volume weighted average price of the shares over the period.
South32 Chief Executive Officer Graham Kerr said: "Our continued support of Arizona Mining is aligned with our strategy to invest in high-quality mining projects where we can add value. This incremental investment increases our interest in the highly prospective Hermosa Project and demonstrates our commitment to work with Arizona Mining to unlock its full potential."
In May 2017, South32 acquired 45 million Arizona Mining shares, or approximately 15 per cent of Arizona Mining as part of a private placement and investor rights agreement. The investor rights agreement allows South32 to acquire up to, but no more than 19.9% of Arizona Mining within an 18-month standstill period without the consent of Arizona Mining's board of directors.
South32 is a globally diversified metals and mining company with high quality operations in Australia, Southern Africa and South America.
Arizona Mining Inc., an augustagroup company, is a Canadian mineral exploration and development company focused on the exploration and development of its 100%-owned Hermosa Project located in Santa Cruz County, Arizona.
Ted Liu
Ted is the architect of CVCA infobase, and is the architect of CPE Media's Financings.ca, Canada's most sophisticated and advanced all private capital and public market financing database.
Latest posts by Ted Liu (see all)
- Gradient Ventures makes add-on investment in BenchSci - June 25, 2019
- OPG to acquire I Squared Capital's Cube Hydro for US $1.12B - June 25, 2019
- BDC Capital invests $1.25M in TickTrade Systems - June 25, 2019


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Release Date: 2015-02-12
Last Update: 2018-09-21
Version: 1.11.1
WordPress: 5.1.x
HeroMenu makes sure that you can set up a very professional looking WordPress menu within a few minutes. From a very complicated Mega Menu, rich with features, down to the simplest of menus with simple dropdowns. Whether you are a long time WordPress guru or a complete newbie, the months we have spent honing the HeroMenu user experience have resulted in an easy, free flowing creative process you'll master at a glance.
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Interview: Howard Jones talks touring, music career, future plans
Markos Papadatos
Nov 18, 2016 in
New wave icon and synth pioneer Howard Jones chatted with me about his music career, touring in the United States, and future plans.
This past summer, Jones played a show at
The Paramount
in Huntington on Long Island, which garnered a favorable review from Digital Journal, which dubbed it as "nostalgic." "That was great. It was fantastic. I've played there a few times, but that was probably the best show I've done there," he said.
Jones and his high-tech band wrapped a highly successful run of summer tour dates as special guests on the extensive "Last Summer On Earth tour" with Barenaked Ladies and the English electronic band OMD in the United States.
The veteran music star will return to the United States for headline shows later in November and December. "I'm flying out on Sunday, and I am going all over. It's the last tour of the year," he said.
Throughout his respected career in the music industry, which spans over three decades, Jones has sold over eight million albums worldwide and he continues to make new music and tour the world.
Each day, Jones is motivated by his love for music. "I feel I am in a privileged position, and it's such a great pleasure to play songs for people and make them happy, and lift their spirits for a couple of hours. I always keep reminding myself about that," he said.
Regarding the key to longevity in the music industry, he said, "It's having a passion for what you do, and for the music, and for communicating things to people through songs. That's what keeps me going. It's what I always wanted to do ever since I was a small child, and I've never ran out of steam to keep doing it. It's always a very exciting and a brilliant thing to do. I'm getting better at it now, after all these decades."
He shard that his
album was a whole different concept for him, and he listed "The Human Touch" as his personal favorite song on there. "It wasn't conceived as a studio album. I wrote the music based on the idea that I was going to play the songs in front of an audience. It was meant to take people on a sound and visual journey, and to really involve the people in the whole journey," he said.
For his fans, he concluded, "Thank you for sticking with me for 33 years. I'm very grateful that people still want to see me and hear the new music, and they are the best fans ever."
Jones' album
is available on
To learn more about veteran music star Howard Jones and his touring itinerary, check out his
official website
More about
Howard Jones
new wave
Howard Jones
new wave
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The Washington Nationals have issued the following statement about Friday night's game versus the Los Angeles Dodgers:
"Our initial investigation indicates the power failure at Nationals Park last night was caused by a faulty circuit breaker. It was replaced shortly after midnight and the lights were tested throughout the night with no additional outages. While we believe we have identified and corrected the issue, additional tests are being conducted by the manufacturer of the field lighting system.
"The Nationals organization would like to again apologize to our fans for any inconvenience this incident may have caused.
Last night's game against the Los Angeles Dodgers will resume today at 2:05 PM."


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26 Fox Hunt Dr #163
Bear, DE 19701
37474 Leisure Drive
Selbyville, DE 19975
P.O. Box 482
Bethany, DE 19930
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Audemars Piguet
Royal Oak Chronograph 41
UNWORN Audemars Piguet Royal Oak Chronograph 41mm Stainless Steel 26331ST.OO.1220ST.01.
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text:
The FLDC director Prof. Dr. / Alaa El-Din Hemeda announced about organizing a new training course "Financial and Legal Aspects of Universities".
Which will be held on Monday, September 23-24, 2018, a 15-hours per day course.
It's targeting training 18 trainee
The session today will be lectured by Dr. / Mohamed Moussa who is a lecturer at the Faculty of Commerce, at the USC and an accredited international trainer from the International Body of Certified Trainers (IBCT)
The objective of this program is to provide participants with the basic knowledge, skills and positive attitudes required for familiarity with the financial, economic and legal disciplines of universities.
By the end of the program, the trainee will be able to:
Discusses the basics of budget preparation at the university.
Determines methods and types of control over financial aspects.
Defines the legal controls in the disciplinary system and the university councils.
Deals with different legal positions in universities.
Shows a positive trend towards respecting the laws of the university and the importance of control over the financial aspects and abide by its rules and regulations.


text:
"Working with Omar Pound, an expert on Lewis and controller of rights to his estate, and using my own understanding of Lewis†work, I have attempted to create the work that he would have done. It is bound on boards with a clamshell box covered with Italian Linen book cloth."вЂCharles D. Jones
Related Subjects
- ">Classics By Subject
- ">English drama (Tragedy)
- ">English, Irish, Scottish Fiction & Literature Classics
- ">Greco-Roman Folklore & Mythology
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- ">Political & Social Issues - Drama
- ">Rich people->Drama
- ">Shakespeare
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