March 2004
Intermediate to advanced
440 pages
11h 46m
English
book
DB2 UDB V8 and WebSphere V5 Performance Tuning and Operations Guide
by Whei-Jen Chen, Peter Z He, Kang Yong Ying, Andreas Paulsen, Sunminder S Saini
Content preview from DB2 UDB V8 and WebSphere V5 Performance Tuning and Operations Guide
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284 DB2 UDB V8 and WebSphere V5 Performance Tuning and Operations Guide
memory used for the locks. MAXLOCKS parameter indicates the percentage an
application can hold of the available locks. If an application requests more locks
than specified by this parameter then lock escalation occurs.
The database manager determines which locks to escalate by looking through
the lock list for the application and finding the table with the most row locks. If
after replacing these with a single table lock, the MAXLOCKS value is no longer
exceeded, lock escalation will stop. If not, it will continue until the percentage of
the lock list held is below the value of MAXLOCKS. The MAXLOCKS parameter
multiplied by the MAXAPPLS parameter cannot be less than 100 ...
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