Re: Which RBS have active transactions?

Terrian, Tom wrote:
>
> Does anyone know of a way to determine which RBS extents have active
> transactions?
>
> Specifically:
> select a.segment_name, a.bytes, a.extents, c.xacts
> from dba_segments a, dba_rollback_segs b, v$rollstat c
> where a.segment_type = 'ROLLBACK'
> and a.segment_name = b.segment_name
> and b.segment_id = c.usn;
>
> SEGMENT_NAME BYTES EXTENTS XACTS
> -------------------- ---------- ----------
> ----------
> RB01 14745600 90 2
> RB02 7364608 45
> 2
> RB03 3276800 20
> 2
> SYSTEM 5079040 62 0
>
> RB01 has 2 active transactions and 90 exents. Can I tell which of the exents
> have the active transactions?
>
> Tom Terrian
> Oracle DBA
> WPAFB - DAASC
> tterrian_at_daas.dla.mil
> 937-656-3844
>

I do not think so. V$TRANSACTION will give you information about the extent where it all started and how much rollback has been used (I think - out of memory), but you will not be able to tell exactly which extents (but the first one) are involved. I think that the detail is hard-coded somewhere in the RBS header ('slot'), I don't think that it's accessible even in some obscure X$.

--
Regards,

  Stephane Faroult
  Oriole Corporation
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Author: Stephane Faroult
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