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  1. Derby
  2. DERBY-269

Provide some way to update index cardinality statistics (e.g. reimplement update statistics)

    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 10.0.2.0, 10.0.2.1, 10.1.1.0, 10.2.2.0, 10.3.1.4
    • Fix Version/s: 10.5.1.1
    • Component/s: SQL
    • Labels:
      None

      Description

      Performance problems are being reported that can be resolved by updating the cardinality statistics used by the optimizer. Currently the only time the statistics are guaranteed to be an up-to-date is when the index is first created on a fully populated table. This is most easily accomplished on an existing table by using the command:

      alter table <table-name> compress [sequential]

      Compress table is an I/O intensive task. A better way to achieve this would be to re-enable parser support for the 'update statistics' command or re-implement the update in some other fashion.

        Attachments

        1. DERBY269_update_statistics_svnstat_ver2.txt
          1 kB
          Mamta A. Satoor
        2. DERBY269_update_statistics_svndiff_ver2.txt
          51 kB
          Mamta A. Satoor
        3. DERBY269_update_statistics_svnstat_ver1.txt
          1 kB
          Mamta A. Satoor
        4. DERBY269_update_statistics_svndiff_ver1.txt
          37 kB
          Mamta A. Satoor

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              • Assignee:
                mamtas Mamta A. Satoor
                Reporter:
                stan Stan Bradbury
              • Votes:
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                Watchers:
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                Dates

                • Created:
                  Updated:
                  Resolved: