DBMS_STATS

ORA-1422 and ORA-6512 from SYS.DBMS_STATS in Post Upgrade

Posted on May 4, 2021 by Optimizer Patch Recommendation 3

Ernst Leber sent me an email today. He hit an error at a customer upgrading to Oracle 19.9.0 on Exadata with AutoUpgrade. ORA-1422 and ORA-6512 from SYS.DBMS_STATS in Post Upgrade were signaled – and he better flashed back to the Guaranteed Restore Point. He found even a MOS note but still had questions. So time to blog about it in case you hit this error sequence as well.

What happens, and when does it happen?

At first, this is not an AutoUpgrade issue. You may see the same error stack in the post upgrade …

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Differences between Automatic Statistics Gathering job and GATHER_SCHEMA_STATS

Posted on March 1, 2016 by Oracle Database 12c Statistics 12

Recently a customer raised a question whether there are differences between the Automatic Statistics Gathering job and a manual creation of stats via the GATHER_SCHEMA_STATS procedure.

The results in performance were quite interesting. Performance after an upgrade from Oracle Database 11.2.0.3 to Oracle Database 11.2.0.4 was not good when the automatic stats job got used. But performance changed significantly to the better when schema stats were created with the downside of taking more resources during the gathering.

Is the Automatic Stats Gathering job enabled?

That question can be answered quite easily. There’s a very good [MOS Note has been disappeared] …

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Mike Dietrich
Oracle Senior Director of Product Management for Database Upgrade, Migrations and Patching writing just another blog.

Opinions certainly are my own as is this page.

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