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How to stop MV and dbms jobs during migration

Vinay KFeb 7 2025

we are in the process of migrating the database from one data center to other using DR method. After migration we are converting non-cdb to cdb database.

There are 2 databases involved in this and we have a replication between these 2 db's using ogg. There are set of tables which i need to ensure are in Sync in both the tables which are part of ogg replication. There are some dbms jobs which might update them and can make the tables go out of sync between source and target during this migration, causing the OGG replication to be in jeoparty requiring initial loading.

During cutover from source, can i disable dbms jobs ie before cutover on source and ensure that no dbms jobs is running causing mismatch in table data ?

i was thinking of making job_queue_process 0 in source and target both to ensure no data changes happen until we setup OGG replication in new environment

is this approach correct.

Comments

MartinBach-Oracle Jan 8 2025

Hi Salomon,

please have a look at this blog post written by @ulrike-schwinn-oracle :

https://blogs.oracle.com/coretec/post/easy-sql-statement-tracking-in23c

I hope this answers your question, if not, please shout!

- Martin

Solomon Yakobson Jan 8 2025

@martinbach-oracle - No, it doesn't answer my question. Article you pointed to shows uses:

SQL> alter system set sql_history_enabled=true scope=both;

And in my post I said “Works fine when enabled on system level”. My question was about

SQL> ALTER SESSION SET SQL_HISTORY_ENABLED = TRUE;

where I showed SQL history was NOT captured even though it should be based on SQL_HISTORY_ENABLED:

Modifiable **ALTER SESSION**, ALTER SYSTEM

SY.

MartinBach-Oracle Jan 8 2025

As per the article I shared the situation is as follows at the moment

  • You must enable SQL history PDB-wide (only a DBA can do that) so there's a certain level of control over the feature
  • Your session has access to the SQL history
  • If you don't want to record anything, set sql_history_enabled to false.

I'm currently assessing if that's intended behaviour (in which case the documentation should be amended) or a feature not working as it should (in which case it needs fixing). The parameter is indeed session-modifyable, but not in the sense you expected.

We'll keep you posted.

- Martin

Solomon Yakobson Jan 8 2025

Do you mean it must be enabled on system level and not on session level and all session can do is disabe it for the session?

SY.

MartinBach-Oracle Jan 14 2025

Yes,

that's correct as of Oracle Database Free 23.6.

- Martin

Solomon Yakobson Jan 14 2025

Thanks Martin, I hope this will be added to 23AI docs soon.

SY.

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Added on Feb 7 2025
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