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Status Not under consideration
Workspace Informix
Components Informix Server
Created by Guest
Created on May 8, 2019

RELATED IDEAS

Automatic Statistics table exclusion list

We have a 3 billion row table that we would like to remove from AUS selection and manually run statistics as it is failing due to exhausting the 48Gb of sort disk

  • Guest
    Reply
    |     Dec 2, 2020

    You could give up on AUS and run dostats instead. Dostats supports both inclusion and exclusion lists via command line options supplying individual tables, a filename containing tables to include or exclude, or a SQL filters. Also, you can use PSORT_DBTEMP to have dostats perform its sorting in filesystems outside of Informix's dbspaces if you need more sort space.

  • Guest
    Reply
    |     Aug 7, 2019

    Automatic statistics assumes that lead columns of indexes should be run with 'stats high'. We have a primary key index on a single column that has a uniform distribution.

    • There is no record deletion, only addition.
      • This implies that stats high will be of no benefit
      • potentially have an optimizer negative performance impact as it considers a non-uniform distribution in generating the optimal access path .
    • In addition to run automatic update stats for this table requires 93 GB of tempspace
      • all others require less than 16GB.
    • Currently we manually run statistics for this table with selective options thus mostly avoiding automatic stats being triggered.

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