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Dynamic Plan Stability - Option to restabilize an invalidated query missing

We've got several SQL queries stabilized with dynamic plan stability. Reason is to prevent them from getting a bad accesspath. After operations like "ALTER TABLE ... ROTATE PARTITION..." the query is flagged to valid N in SYSIBM.SYSDYNQRY. Than we may suffer again from a bad accesspath. Therefor it should be possible to "restablize" the accesspath in SYSDYNQRY.

  • Guenther Paschke
  • Mar 27 2020
  • Needs review
Why is it useful?
Who would benefit from this IDEA? DBAs would like that because they'll save a lot of time. Banking customers would like that because they won't suffer from outages.
How should it work?

1) Proposed solution: give us a command like "RESTABILIZE ...."

2) The bad accesspathes sometimes cause severe problems for our banking customers. With this solution we'ld have a fast workaround.

3) Our workaround is to collect plan_table data with the good accesspath (maybe in another Db2 system) and than implement an OPTHINT.

Idea Priority High
Priority Justification Reason for high priority is the danger of outages
Customer Name Fiducia & GAD IT AG
Submitting Organization
Submitter Tags
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