Skip to Main Content

Breadcrumb

Question and Answer

Chris Saxon

Thanks for the question, Vanka.

Asked: August 10, 2017 - 6:20 am UTC

Last updated: August 10, 2017 - 9:53 am UTC

Version: Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production

Viewed 10K+ times! This question is

You Asked

Hi TOM,

I am using reorg on around 50 tables. I am using below queries.

"alter table tablename enable row movement;"
"alter table tablename shrink space;"
"ALTER TABLE tablename DEALLOCATE UNUSED;"

Is there any way that we can check whether reorg is required for a particular table or not. so that I can skip the tables which do not require Reorg.

Thanks and Regrads,
Satya.



and Chris said...

No tables "require" a reorg. I'm guessing what you're really asking "which tables have significant free space we can reclaim?"

If so Tim Hall has a detailed article about finding and reclaiming unused space. Read it at:

https://oracle-base.com/articles/misc/reclaiming-unused-space

Just beware of unintended side-effects!

You don't want to be like this poor person who found their application was slower after shrinking tables:

https://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:9536157800346457013

Is this answer out of date? If it is, please let us know via a Comment
more

Connor and Chris don't just spend all day on AskTOM. You can also catch regular content via Connor's blog and Chris's blog. Or if video is more your thing, check out Connor's latest video and Chris's latest video from their Youtube channels. And of course, keep up to date with AskTOM via the official twitter account.

More to Explore

Administration

Need more information on Administration? Check out the Administrators guide for the Oracle Database