RE: shutdown hang

Teresa:

I usually figure it will take as long to roll back the transaction as the time taken so far (for row modifications). If you've been continuously updating/deleting rows for the past 5 hours, I would figure about 5 hours to roll back. If you've only done 3 updates in 5 hours, they by the time you've typed ROLLBACK - it's already done! HTH.

Colin.

-----Original Message-----
From: Southerland, Teresa [mailto:tsouther_at_indiana.edu] Sent: Wednesday, May 24, 2000 1:16 PM
To: Multiple recipients of list ORACLE-L Subject: RE: shutdown hang

Winnie,

I have an off the wall question. If there was a transaction running that executed 120,000 rows and had to rollback without shut down to the database, what kind of time frame would this take?

Thanks,

Teresa

-----Original Message-----
Sent: Friday, May 19, 2000 1:16 PM
To: Multiple recipients of list ORACLE-L

Joan,

The reaon is that in your first startup, Oracle does NOT clean up everything yet. It opened the database for you to use, but still cleaning up the processes inthe background. Those clean up may take any time from minutes to days (from some Oracle guru in Oracle corporation).

If you are looking at the alert.log file after those startup, you should see something like

SMON: enabling cache recovery
SMON: enabling tx recovery

The database is up and running fine, but SMON is doing the recovery at the background.

Until you see the words:

SMON: disabling cache recovery
SMON: disabling tx recovery

The recovery done by SMON is not done yet. This process may take hours and days if you are temporary segments is huge and there are a lot of clean up need to be done by SMON.

When you do a shutdown immediate, since you are asking Oracle to shutdown the database cleanly. SMON had to finish that job before shutting down the database. Those hours/days will then add to your shutdown time.

So the best method for me (which I also get from Oracle) is to do a shutdown abort and then a startup and wait for the SMON recovery to be finished in the background.

There are a few events that you can set to free up SMON from performing those daily activities and concentrate on the recovery. If you are interested, I will send them to you.

Hope it makes more sense now.

Winnie

Joan Hsieh <jhsieh_at_infonet.tufts.edu> on 05/19/2000 07:28:05 AM

Please respond to ORACLE-L_at_fatcity.com

To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> cc: (bcc: Winnie Liu/HQ/ISC)

Winnie,

I did shutdown abort and startup (took 20 min.) What concerns me is after startup, I did shutdown immediate again. It hangs (more than one hour and didn't comeback) NOBODY on the system. My question is the first startup should clean up everything, why shutdown immediate hangs after?

Thanks,

Joan

ORACLE-L_at_fatcity.com wrote:
>
> It is perfectly normal. But if I were you, I will shutdown abort and
> startup again (oracle is actually cleaning up the processes in the
> background, they are doing the same job as if you issue the shutdown
> immediate). At least the database is up and running while Oracle did the
> cleaning.
>
> My worst nightmare is to wait for 14 hours for it to get cleaned up.
>
> Winnie
>
> Joan Hsieh <jhsieh_at_infonet.tufts.edu> on 05/18/2000 02:19:39 PM
>
> Please respond to ORACLE-L_at_fatcity.com
>
> To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> cc: (bcc: Winnie Liu/HQ/ISC)
>
> Hi List,
>
> One of the developers deleted more than 120,000 rows on a small
> database. In the middle of the session, he killed the process.(because
> hang) I did shutdown abort and startup again (waited a while whitout
> problem) and want to shutdown immediate and startup over again. This
> time shutdown immediate hangs. Is this normal (waiting rollback)? I've
> been hang here for over one hours now.
>
> Thanks in advance,
>
> Joan
> --
> Author: Joan Hsieh
> INET: jhsieh_at_infonet.tufts.edu
>
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--
Author: Joan Hsieh
  INET: jhsieh_at_infonet.tufts.edu

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-- 
Author: 
  INET: Winnie_Liu_at_infonet.com

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Author: Southerland, Teresa
  INET: tsouther_at_indiana.edu

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