RE: Rollback Segment Question

From: Yadav, Shailesh <NDASY3_at_labor.state.ny.us>
Date: Wed, 25 Jul 2001 09:16:04 -0700
Message-ID: <F001.00354C64.20010725091622@fatcity.com>

Kamel,

Looks like you may have had multiple transactions in your PL/SQL prg. Since one transaction ended, the slot used by it to store undo information was reused by other transactions. Your query did not find the required undo information and thus "Snapshot too old error". Had this been a long running transaction then more extents would have been automatically allocated. My best guess is that you were updating the table that you were querying. Its best in a situation like that to(if possible) avoid reading from the table that you are updating, else do what you did, i.e. pre-allocate extents.

HTH
Shailesh

-----Original Message-----
Sent: Wednesday, July 25, 2001 11:51 AM
To: Multiple recipients of list ORACLE-L

Hi All

I had a long PL/SQL prg to run .

I created a special rollback segment for that script with the storage of (initial 1 m next 1m minextents 2).

After a few minutes of running I got the "Snapshot too old" error.

In the v_$rollstat view I got : extents=2, rssize ~ 2 M, hwmsize ~ 2 M.

I recreated the RBS with minextents 100, at this time my program run succefully.

My question is why in the first case the RBS didn't growth automatically by allocating a new extents until maxetents value ?

Thank you

Best Regards
Kamel Benlatreche
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Author: GL2Z/ INF DBA BENLATRECHE
INET: kbenlatreche_at_lth.sonatrach.dz

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Author: Yadav, Shailesh
INET: NDASY3_at_labor.state.ny.us

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