Why my UNDO is not free space?

Hi all

11.2.0.1

AIX6

We continue by executing the same batch of jobs and app every day.

I want to check what UNDO is my data used in a day.

So I reset my undots1 drop it, created a new undots2 for a fresh reboot.

Then, I followed the use of CANCEL at the end of the first day. It has reached its use 6 GB.

To my knowledge, I thought it will just all reuse the days of size and extend no more.

But when I check the next day, he grows up to 7 GB and the next day as well.

My CANCELLATION continue to grow forever?

What happened, if I put my UNDO_RETENTION = 0? so it will free up the space used immediately?

Is this possible? How can I configure my UNDOTS to release quickly once I have post the transaction?

Thank you all,

pK

As I said before, if you're not facing problems, you don't need to change anything. Your settings look good.

If you look at several that queries will fail with errors, you can then start diagnose more on UNDO tbs parameters.

You can read through the following about the holdback, the optimal undo retention period.

http://docs.Oracle.com/CD/E11882_01/server.112/e25494/undo.htm#ADMIN11463

To the size of your Undo tablespace, use the Advisor to cancel, you first estimate these two values:

-The length of your planned more long running query

After the database has completed a cycle of workload, you can display the field in the query to run longer on the subpage of the activity of the system of automatic the Undo Management page.

-L' longer interval that you will need for operations to Oracle Flashback

For example, if you plan to run Oracle Flashback queries for 48 hours in the past, your Oracle Flashback condition is 48 hours.

Then take the maximum of the two values, and use that value as input to the Advisor to cancel it.

The Advisor to cancel running does not change the size of the undo tablespace. The Counsellor simply returns a recommendation. You must use ALTER DATABASE to change the size of the tablespace data files.

Kind regards

Suntrupth

Tags: Database

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