March 2006
Intermediate to advanced
630 pages
14h 45m
English
book
DB2 Performance Expert for Multiplatforms V2.2, 2nd Edition
by Whei-Jen Chen, Ute Baumbach, Marcia Miskimen, Werner Wicke
Content preview from DB2 Performance Expert for Multiplatforms V2.2, 2nd Edition
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Appendix A. Rules of Thumb definition samples 469
Tablespace cluster definitions
The tablespace cluster contains Rules of Thumb that evaluate counters related to
tablespaces.
AsynchVsSynchRead
Yields the ratio of asynchronous (prefetched) to synchronous (random) physical
read I/Os in percent. The formula used in the Value field is:
( POOL_ASYNC_DATA_READS + POOL_ASYNC_INDEX_READS ) / (
POOL_DATA_P_READS + POOL_INDEX_P_READS ) * 100
Table A-15 shows the value of comparison expression, warning threshold,
problem threshold, and the content of recommendation for
counterAsnchVsSynchREad.
Table A-15 AsynchVsSynchRead counter value
.
Comparison Warning
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