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Status Future consideration
Workspace Db2
Components BLU Acceleration
Created by Guest
Created on Jul 20, 2022

RELATED IDEAS

Bitemporal tables and missing highest quantiles

If a user issues FOR BUSINESS_TIME AS OF clause against a bitemporal table, DB2 translates it to a where clause with two range predicates against business_time columns.

In our system following situation occurs quite frequently:

1) At all times table has data with business_time end time = ‘9999-12-30’

2) RUNSTATS are executed with this clause ON ALL COLUMNS WITH DISTRIBUTION ON ALL COLUMNS AND DETAILED INDEXES ALL, but still manage to miss the highest quantile of ‘9999-12-30’

3) This leads to estimates of 1 / cardinality of the table and an inperformant access plan

For details see the case TS009699350.

Please adjust the quantile calculation algorithm for the business_time column, so highest value for the end time is always determined.


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