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Home -> Community -> Mailing Lists -> Oracle-L -> RE: RE: Rollback Segment Problem
How long does a database have to remain running in order for a rollback
segment to go to the happy hunting grounds? Have you ever seen such an
event? A simple instance restart will cure that disease. Anyway, the only
thing that I can envision to cause this is to have an OLTP database with
something
like 1000000 online users doing more then 4000 transactions a day and the
instance is configured with a single rollback segment. In that case the
DBA deserves to be executed by the ways of the weight watchers!
-----Original Message-----
Sent: Thursday, February 14, 2002 2:36 PM
To: Multiple recipients of list ORACLE-L
Hi G_DBA ,
The transaction id (which is recorded in the ITL) consists of 3 components. Undo Segment Number, Slot Number and Wrap Number. THe max value of the wrap number is limited by UB4MAXVAL. (Approx 4G in numbers) and once it reaches the MAXVAL the rollback segment is considered as DEAD. i.e. it can not hold undo information for any transactions.,
THis condition is called as DEATH of a Rollback segment. THis is true for SMU also.
Best Regards,
K Gopalakrishnan
Bangalore, INDIA
-----Original Message-----
Sent: Thursday, February 14, 2002 2:35 AM
Hi Ganesh,
Could u please elaborate, i did not get what u said.
What do u mean by Rollback segment dying.
I did not pick up the earlier mails so maybe thats why.
thanks and reg
Guru
On Thu, 14 Feb 2002 K Gopalakrishnan wrote :
> You never need to recreate the rollback segments (DROP
> and CREATE) unless
> the rollback segment dies. THe rollback segment will
> die after approx 4M
> (the number is not very accurate.. okay,, some number)
> transactions.
> THis is the only case I need to drop and recreate them.
>
> Best Regards,
> K Gopalakrishnan
> Bangalore, INDIA
>
>
>
> -----Original Message-----
> From: root_at_fatcity.com [mailto:root_at_fatcity.com]On
> Behalf Of Mohammad
> Rafiq
> Sent: Wednesday, February 13, 2002 9:54 AM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: Rollback Segment Problem
>
>
> In many cases you will have to take RB segments offline
> and drop them, then
> re-create
>
-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: K Gopalakrishnan INET: kaygopal_at_yahoo.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: Gogala, Mladen INET: MGogala_at_oxhp.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).Received on Thu Feb 14 2002 - 14:22:17 CST
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