DB2 can be configured to reduce the number of locks that are acquired during the execution of a statement by enabling certain registry variables.
The following registry variables reduce the locks that are acquired under different circumstances. They might help if you are experiencing locking problems such as lock waits, time-outs or deadlocks.
If your version is older than DB2 V9.5 Fix Pack 4, define the following variables:
Allows table or index access scans to defer or avoid row locking until a data record is known to satisfy a predicate evaluation.
The Evaluate uncommitted data via lock deferral link contains more information on this setting.
Allows statements using either Cursor Stability or Read Stability to skip uncommitted inserted rows as if they had not been inserted.
Allows statements using either Cursor Stability or Read Stability to unconditionally skip deleted keys during index access and deleted rows during table access.
This setting can help reduce lock contention for DELETE statements which
cascade delete to multiple tables. This setting is available in DB2 V8.2 Fix Pack 18 and DB2 V9.5 Fix Pack 4.
If you are running DB2 V9.5 Fix Pack 4 or later, you can set the DB2_WORKLOAD=WC registry variable instead. When set, DB2_WORKLOAD=WC will expand into the following variables,
$ db2set -gd DB2_WORKLOAD=WC
This variable is set automatically when creating new databases with WebSphere Commerce V7.0
Consult the DB2 Information Center for more details on how these variables can be set.
|Commerce||WebSphere Commerce - Express||Configuration||Linux, Windows||6.0||Express|
|Commerce||WebSphere Commerce Enterprise||Configuration||AIX, Linux, Solaris, Windows||6.0||Enterprise|