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Spotlight on DB2 6.9.3 - Getting Started Guide

Hash Join Small Overflows

The number of times that a hash join overflowed available sort heap space by less than 10%. If this number, and the number of hash join overflows are both high, try increasing SHEAPTHRES parameters. If the small overflows number is more than 10% of the number of hash join overflows, try increasing the sort heap size.

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