Re: Users reading from rollback segments

SELECT segment_name,
USN,EXTENTS,RSSIZE,HWMSIZE,optsize,xacts,aveactive,WRAPS,shrinks FROM V$ROLLSTAT,
dba_rollback_segs
where usn=segment_id
xacts =1 is in use. otherwise it is 0.
oracle 8.1.6 you can take an active rollback segment offline, but also kill the transaction. 8.17 supposed to fix the bug. I assume it will let the transaction finished.

Joan

Glenn Travis wrote:
>
> Is there a way to tell if anyone is reading from the rollback segments?
>
> I would like to manually issue 'alter rollback segment XXX shrink;', but do not want to do so if there are users reading read consistent data from the rollback space (thus giving them the ORA-01555 error).
>
> Is there a way to check if the rollback segment is in use first?
>
> Can I try to take it offline? Will it fail if there is someone reading from it?
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Glenn Travis
> INET: Glenn.Travis_at_sas.com
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> San Diego, California -- Public Internet access / Mailing Lists
> --------------------------------------------------------------------
> To REMOVE yourself from this mailing list, send an E-Mail message
> to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> the message BODY, include a line containing: UNSUB ORACLE-L
> (or the name of mailing list you want to be removed from). You may
> also send the HELP command for other information (like subscribing).

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Joan Hsieh
  INET: joan.hsieh_at_tufts.edu

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).