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Option to override LOAD utility maintaining MAXASSIGNEDVAL for identity columns in Db2 V12

Our existing process to move data from one region to another using the LOAD utility stopped working on tables with generated by default as identity key column after we upgraded to Db2 12. The new LOAD enhancement to maintain MAXASSIGNEDVAL is causing issues and we need an option to override or disable this new feature at the LOAD utility level.

Db2 12 introduced the LOAD utility to maintain MAXASSIGNEDVAL for user-provided input, and this new feature is enforced with LOAD REPLACE and LOAD RESUME YES. Prior to Db2 12, LOAD utility did not update MAXASSIGNEDVAL.

This is how it works now under Db2 V12:

If input file has identity column value higher than MAXASSIGNEDVAL in the Catalog, LOAD updates MAXASSIGNEDVAL with the higher value.

If input file has identity column value lower than MAXASSIGNEDVAL in the CATALOG, LOAD does not update MAXASSIGNEDVAL.

This design work fine with LOAD REPLACE as data gets replaced with the input file, but it does not always work with LOAD RESUME YES when input file gets added to the existing data.

With LOAD RESUME YES, MAXASSIGNEDVAL does not necessarily represent the maximum value. Table can potentially have identity key column value higher than the input file and MAXASSIGNEDVAL in the Catalog.

When LOAD utility updates MAXASSIGNEDVAL based on what's in the input file that shows higher than MAXASSIGNEDVA catalog but table actually has higher value than the input file , it will create -803 errors.

To mitigate this issue, we need an option to disable or override the new behavior with LOAD utility. Thank you.

  • Guest
  • Apr 14 2020
  • Delivered
How should it work?

1)Proposed solution is to provide an option to override LOAD maintaining MAXASSIGNEDVAL.

2)This solution will give users an option to either use the new feature or disable the new feature based on their data requirement at the table level.

3)As a work around, SI team is coordinating with the DBA team to alter START WITH value.

Idea Priority Urgent
Client Name Lori Choi
  • Attach files
  • Admin
    Janet Figone commented
    14 Aug, 2020 05:25pm

    APAR PH28476 created.

  • Guest commented
    3 Aug, 2020 05:36pm

    We upgraded to V12 last week & saw this 'new functionality' immediately.

    We are currently experiencing issues on a table with an identity key that has cycled. This table gets purged using an unload & load. The load utility is sloppily resetting the MAXASSIGNEDVAL to the highest value in the table (which is about 2.1 billion). The identity key then cycles the next morning as we see 10s of millions of inserts a day. We then hit a -803 shortly after the cycle occurs.

    Until we can script a fix - our only work around at this time is to manually alter the identity key DAILY after determining what the correct 'START WITH' value should be (what the MAXASSIGNEDVAL was before the load).

    This is extremely frustrating. Thanks V12.

  • Guest commented
    16 Apr, 2020 11:04pm

    It would be of great benefit if this override is added. If it isn't added, I will be disappointed.

  • Guest commented
    15 Apr, 2020 01:29pm

    we need this

  • Guest commented
    14 Apr, 2020 09:28pm

    yes


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