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 C. DB2 Performance Expert For Business Intelligence 577
scanned and dynamically hashed on the join column. Then the hashed data is
sent via table queues to the according partition where the actual join is
performed. This operation results in a lot of data being transferred over the wire if
the tables are large.
If you detect directed table queues, you might want to reconsider the partition
keys or the distribution of tables to node groups, or you might want to revise the
queries. The optimum goal to strive for is collocated joins between the tables. You
can recognize them by using Visual Explain to look for joins between tables that ...
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