ative files, the logical order corresponds to the physical order of the records in the file. For indexed files, the logical order is based on the order of the keys in the index of the file.
logical output device
For line devices, the combination of a physical output device and such logical variables as page size and number of lines per vertical inch. A specification of 1403W6 is an example of a logical output device.
- In the IMS message format service, a user-defined group of related message segment and field definitions.
- The defined presentation space on the physical form. All the text and images in the print data must fit within the boundaries of the logical page, which has specified characteristics, such as size, shape, orientation, and offset.
- In COBOL, a conceptual entity consisting of the top margin, the page body, and the bottom margin.
logical page list (LPL)
A list of pages that are in error and that cannot be referenced by applications until the pages are recovered. These pages are in logical error even though the actual media (coupling facility or DASD) might not contain any errors. Usually, a connection to the media has been lost.
logical page origin
The point on the logical page from which positions of images, graphics, page overlays, and text with 0-degree inline direction are measured. See also media origin.
In MFS, the means by which output message segments are grouped for formatting. See also operator logical paging.
- In a partitioned database environment, a database partition server on a processor that has more than one database partition server assigned to it.
- One or more virtualized images of a hardware computing system that can include shared and dedicated resources assigned from the pool of resources available on a physical server. Each image appears to the operating system running within it to be a unique instance of a physical server. See also dynamic LPAR, path group, virtual server, virtualization.
- A set of key or RID pairs in a nonpartitioning index that is associated with a particular partition.
In ESS Copy Services, a relationship between a source logical subsystem and target logical subsystem that is created over a physical path through the interconnection fabric used for Copy Services functions.
- In COBOL, the most inclusive data item. The level number for a logical record is 01.
- A group of logically related fields. Portions of the same logical record may be located in different physical records, and several logical records or parts of several logical records may be located in one physical record.
- In OSI, an abstract resource such as a layer entity. See also physical resource.
- A software construct, such as a lock or a buffer, that is required for the execution of a program and is in limited supply.
- On z/OS, a subsystem that is running DB2 for z/OS.
- In replication, on Linux, UNIX, and Windows, a DB2 database.
- A conceptual storage layout in which an application maps first into logical addresses, which are then mapped into real addresses by control blocks.
- With respect to data, the attributes that describe the data and its usage, as opposed to the physical location of the data. See also physical storage.
- The amount of central storage required by a job or a job step to execute efficiently on a processor.
logical subsystem (LSS)
The logical functions of a storage controller with which one or more host I/O interfaces can access a set of devices. The controller groups the devices according to the addressing mechanisms of the associated I/O interfaces. One or more LSSs exist on a storage controller. In general, the controller associates a given set of devices with only one LSS.
In Q replication, all of the copies of one table that are distributed across servers in bidirectional or peer-to-peer replication. If a user replicates two logical tables, then copies of both tables are distributed across the servers.
- In SWIFT, the logical entity through which users send and receive SWIFT messages. A logical terminal is identified by its LT name.
- A message destination logically