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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550 DB2 Performance Expert for Multiplatforms V2.2
Open the details view by double-clicking the entry of interest and check the rows
read and written counters (Figure C-29). Now compare these to the same
counters of the details panels of the other partitions of the same application
handle.
If the numbers are approximately the same, then the data skew on the base
tables is likely not the cause of the skew on the temporary tablespace.
Figure C-29 Application details of a partition
Sort and hash join tuning
Sorting usually has a large impact in BI systems. For example, ORDER BY,
GROUP BY, DISTICT, HAVING, or UNION clauses require the data to be sor ...
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