Re: CTAS use of rollback

Confirmed.

"Nicoll, Iain (Calanais)" wrote:

> Could anyone tell me whether Create table .. as select .. uses rollback.
>
> I initially thought it would (despite being a cross between ddl and dml) but
> having created a 3.5 million row table and checked the sum of the writes in
> v$rollstat it had only done ~130k writes between the start of the ctas and
> the end. It also doesn't create the table initially but just has a numbered
> object which it seems to rename only at the very end, so if it fails I would
> have though it would just drop that object and if it completes successfully
> then a commit would be done because of the ddl aspects of the command.
>
> I tried inserting 10k rows into the same table and this came back with about
> 25k writes (seemed reasonable if it's only storing the rowid). Given this
> it doesn't seem to be using rollback (other than recording changes to
> extents etc) but I'd appreciate confirmation.
>
> Iain Nicoll
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Nicoll, Iain (Calanais)
> INET: iain.nicoll_at_calanais.com
>
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--
Thanks,

Yosi


---------------------------------------------------------
Yosi Greenfield
Oracle Certified DBA
ygreenfield_at_compuserve.com


-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Yosi Greenfield
  INET: yosi_at_comhill.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
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