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Status Not under consideration
Workspace IBM i
Categories Db2 for i
Created by Guest
Created on May 16, 2022

Change sequence of access path rebuilds to be based on use rather than size

When access paths are rebuilt; the database sequences the rebuilds to occur based on index size descending. Since history tables and indexes may be quite large but are not often used in Production processing; this presents a roadblock to making the system fully available to the users. In order to restore the system to operational state for Production more quickly; it would be beneficial if the system sequenced the access path rebuilds to occur based on "member open count" descending; assuring tables which aren't frequently used rebuilt last.

Idea priority Low
  • Guest
    Reply
    |
    Jun 19, 2022

    Maybe a CHGRBDAP command can be of help where one can define priorities based on library / PF name?

  • Guest
    Reply
    |
    Jun 14, 2022
    IBM does not intend to provide a solution to this request at this time, so it is being closed.

    Determining the correct order for rebuilding access paths is highly dependent on the system and the indexes that need to be rebuilt at the time. While adding options for automatic rebuild rules sounds like a reasonable request, the variability of each situation would make it difficult for an administrator to configure appropriately.

    There is an existing solution to help with this situation. The EDTRDBAP command is provided to allow you to select the order of access path rebuilds. See this technical note for details:
    https://www.ibm.com/support/pages/using-edtrbdap-command-rebuild-invalid-access-paths

    Db2 for i development team
    IBM Power Systems development