Hi Joe,
Thanks for the prompt reply in the forum.
btw, When we use AUTO value for UNDO Management, it is supposed to be
handled by oracle AUTOmatically.
I have read the docs. there is not much info reg. this......
My question is :
If Oracle is handling it, then why contention for UNDO HEADER in V$waitstat...inspite
of being allocated enough space for the underlying tablespace ( UNDOTBS
)....??
I will appreciate , if u can really help me.....
TIA
regards,
Arul.
Joe Testa wrote:
its not a doubt and you're not using rollback, your
using automatic undo
management.
read up on it in the admin guide,.
joe
Arul kumar wrote:
> Hi DBAs,
>
> I got a problem in Rollback Segments..
>
> This is the setting for UNDO ( Rollback ) in my init file...
>
> undo_management=AUTO
> undo_retention=900
> undo_suppress_errors=FALSE
> undo_tablespace=UNDOTBS
>
> While querying V$waitstat, got the foll. :
>
> CLASS
COUNT
TIME
> system undo header
0
0
> system undo block
0
0
> *undo header
312
64*
> undo block
1
32
>
> The entry for "undo header" indicates Undo Header contention for
> rollback.. Right ?
>
> Since it is "AUTO" managed, how do i tune ??
>
> I have chk the space usage of the tablespace, it is fairly
enough free
> space...
>
> Any suggestions / tips ?
>
> Thank You.
>
> regards,
> Arul.
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--
Joe Testa, Oracle DBA
Nothing new to put here, hmmmmmm
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Received on Thu Feb 14 2002 - 08:55:17 CST
