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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Chapter 7. Monitoring and tuning of DB2 UDB V8 269
JVMs have a large memory footprint. Many invocations of NOT FENCED
routines on a UNIX-based DB2 server will use a significant portion of system
memory.
This is not the case for Java routines running on Windows NT and Windows
2000, where each DB2 agent is represented by a thread in a process shared with
other DB2 agent threads. This model is scalable, as a single JVM is shared
among all the DB2 agent threads in the process.
If you intend to run a Java routine with large memory requirements, it is
recommended that you register it as FENCED NOT THREADSAFE. For
FENCED THREADSAFE Java routine invocations, ...
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