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 275
In our example the overall buffer pool ratio is 97.82, and this means that the
buffer pool is big enough. The hit ratio for indexes is below 70. The small value of
the indexes hit ratio show that the indexes are in less use. This could mean that
the system is in the point of diminishing returns for a over sized buffer pool. With
this ration we could try to reduce the buffer pool size to set memory free to
improve the system performance.
In general, a good value for the hit ratio is a value more than 90 percent for both
buffer pool hit ratio and index pool hit ratio. When the value is smaller, ...
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