ndled by BMS output commands as if it is a separate terminal.
logical device operation
A generic instruction for a logical device that is independent of its implementation. For example, a logical device operation to add an IP address applies to all operating systems, but the steps for performing this instruction on each operating system are defined by workflows in a device driver for the operation system. See also logical management operation.
A drain on a logical partition of a nonpartitioning index. See also drain.
- See volume.
- A unit of virtual storage that is made available to the network through virtual logical unit numbers (VLUNs) and iSCSI client logical-unit number (iLUNs). A logical drive consists of one or more physical disks that are combined using Redundant Array of Independent Disks (RAID) technology.
- A database file that describes how data is to be presented or received from a program. A logical file contains no data, but it defines record formats for one or more physical files. See also physical file.
- A file that is stored in one or more server storage pools, either by itself or as part of an aggregate. See also aggregate, physical file, physical occupancy.
logical file system (LFS)
A level of the file system at which users can request file operations by using a system call. The LFS provides the user with a consistent view of multiple physical file systems and multiple file system implementations.
A component of a user-defined index over XML data that contains XML pattern information specified by the CREATE INDEX statement. See also physical index.
In NCP, the representation of the connection between NCP and a node communicating with NCP over a physical line such as token-ring or frame-relay. A single physical line can support multiple logical lines. See also physical line.
- A pair of link stations, one in each of two adjacent nodes, and their underlying link connection, providing a single link-layer connection between the two nodes.
- In a multisystem environment, the means by which a physical link is related to the transactions and terminals that can use that physical link. See also physical link.
- A cluster network or a connection between nodes that allows messages and other information to pass between cluster nodes.
- The logical connection between an application on the S/370 and an application on the workstation.
- The data link control (DLC) LAN sublayer that provides two types of DLC operation for the orderly exchange of information. The first type is connectionless service, which allows information to be sent and received without establishing a link.
- A protocol for data-link-level transmission control. The protocol was developed by the IEEE 802 committee, and is common to all LAN standards.
Logical Link Control protocol (LLC protocol)
In a local area network, the protocol that governs the assembling of transmission frames and their exchange between data stations independently of the Medium Access Control protocol.
logical link control protocol data unit
A unit of information that is exchanged between link stations in different nodes. The LLC protocol data unit contains a destination service access point (DSAP), a source service access point (SSAP), a control field, and user data.
logical lock (L-lock)
The lock type that transactions use to control intra-DB2 and inter-DB2 data concurrency between transactions. See also physical lock.
The process of moving log records into the log buffers. See also physical logging.
logically detached partition
A partition that was successfully processed by the ALTER TABLE statement with the DETACH PARTITION clause, but is not yet a stand-alone table. The partition is still accessible to some queries that began reading the partition before the statement was issued. See also asynchronous partition detach.
logically partitioned mode
A capability provided by the Processor Resource/System Manager (PR/SM) that allows a single processor to run multiple operating systems using separate sets of system resources, or logical partitions. See also basic mode.
logical 