Skip to Main Content

Oracle Database Discussions

Announcement

For appeals, questions and feedback about Oracle Forums, please email oracle-forums-moderators_us@oracle.com. Technical questions should be asked in the appropriate category. Thank you!

Interested in getting your voice heard by members of the Developer Marketing team at Oracle? Check out this post for AppDev or this post for AI focus group information.

Oracle 23 feature. Shrink tablespace

oraLaroFeb 8 2025

We’re on prem install only

Reading about oracle 23 new feature shrink tablespace. Where we can avoid running our own scripts to move objects around to trim our tablespaces.
I read a comment https://oracle-base.com/articles/23/bigfile-tablespace-shrink-23 that said it moves the tables to reorganize the objects. I’m guessing this online table move. Which can work great except if you have a basic partitioned table this would fire a usage of advanced compression which a lot of sites, including ours, don’t have.

We use online dbms redef to move our partitioned tables in our home brew scripts for this reason which doesn’t trip the adv usage.

Does anyone have a 23 install they could try this on and see does it trip the licence usage for it? Not that it matters too much but was a feature we had been getting excited about using when 23 eventually landed.

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.

1 - 6

Post Details

Added on Feb 8 2025
0 comments
76 views