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IBM Data and AI Ideas Portal for Customers


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Status Not under consideration
Workspace Db2
Created by Guest
Created on Oct 24, 2018

Fill gap with Oracle optimizer on RP tables

DB2 optimizer in v10.5/v11.1 has still several weaknesses in generating correct plan when using RP tables, because it bases its plan only on global stats when partition (data and indexes) stats are available.

Case TS001150102
  • Guest
    Reply
    |
    Jun 20, 2022

    With same dataset used on Oracle Window, 4 minutes (no tuning) to run the query, when on DB2 AIX, query was running more than 8 hours. Basically, the non full support of RP tables on DB2 LUW (stats per partition), cost a lot to users in terms of tuning, and increases stats time and/or implying to use table & index sampling, which is not that good for stats accurracy. DB2 LUW is doing a bad job even compared Oracle, and even compared to Postgres.