IBM DB2 Manual page 552

lock promotion
The process of changing the size or mode
of a DB2 lock to a higher, more restrictive
level.
lock size
The amount of data that is controlled by a
DB2 lock on table data; the value can be a
row, a page, a LOB, a partition, a table, or
a table space.
lock structure
A coupling facility data structure that is
composed of a series of lock entries to
support shared and exclusive locking for
logical resources.
log A collection of records that describe the
events that occur during DB2 execution
and that indicate their sequence. The
information thus recorded is used for
recovery in the event of a failure during
DB2 execution.
log control interval definition
A suffix of the physical log record that
tells how record segments are placed in
the physical control interval.
logical claim
A claim on a logical partition of a
nonpartitioning index.
logical index partition
The set of all keys that reference the same
data partition.
logical lock (L-lock)
The lock type that transactions use to
control intra- and inter-DB2 data
concurrency between transactions.
Contrast with physical lock (P-lock).
logically complete
A state in which the concurrent copy
process is finished with the initialization
of the target objects that are being copied.
The target objects are available for
update.
logical page list (LPL)
A list of pages that are in error and that
cannot be referenced by applications until
the pages are recovered. The page is in
logical error because the actual media
(coupling facility or disk) might not
contain any errors. Usually a connection
to the media has been lost.
logical partition
A set of key or RID pairs in a
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Application Programming Guide and Reference for Java
nonpartitioning index that are associated
with a particular partition.
logical recovery pending (LRECP)
The state in which the data and the index
keys that reference the data are
inconsistent.
logical unit (LU)
An access point through which an
application program accesses the SNA
network in order to communicate with
another application program. See also LU
name.
logical unit of work
The processing that a program performs
between synchronization points.
logical unit of work identifier (LUWID)
A name that uniquely identifies a thread
within a network. This name consists of a
fully-qualified LU network name, an
LUW instance number, and an LUW
sequence number.
log initialization
The first phase of restart processing
during which DB2 attempts to locate the
current end of the log.
log record header (LRH)
A prefix, in every log record, that contains
control information.
log record sequence number (LRSN)
An identifier for a log record that is
associated with a data sharing member.
DB2 uses the LRSN for recovery in the
data sharing environment.
log truncation
A process by which an explicit starting
RBA is established. This RBA is the point
at which the next byte of log data is to be
written.
LPL See logical page list.
LRECP
See logical recovery pending.
See log record header.
LRH
LRSN See log record sequence number.
LU See logical unit.
LU name
Logical unit name, which is the name by
which VTAM refers to a node in a
network.
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