RE: truncate a table with many extents
- From: "Ruth Gramolini" <rgramolini@xxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 7 May 2004 15:32:20 -0400
Is the upshot of all this, if you are using 9i (or above) a drop should be
faster than a truncate if you don't need to truncate to save the stuff that
goes along with the table?
Ruth
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of Connor McDonald
Sent: Thursday, May 06, 2004 11:50 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Re: truncate a table with many extents
I think that's a recent addition though. I remeber an OakTable
discussion about this when we were
testing 'drop' on lmt's in 8 and 9.0, the tsq$ update occurred
for every extent dropped, and this
was enhanced in 9.2 to be just once at the end of the drop
Cheers
Connor
--- Jonathan Lewis <jonathan@xxxxxxxxxxxxxxxxxx> wrote: >
> I think this is one that probably requires testing
> for every platform and version of Oracle.
>
> I've just run a quick test on 9.2.0.4 with 169 extents
> in an LMT Uniform sized.
>
> The most significant difference is that the TRUNCATE
> updated tsq$ once per extent removed, DROP updated
> tsq$ once at the end. On the other hand, the DROP
> command triggered various other (mostly small) actions,
> including a call to a procedure called aw_drop_proc.
>
> The most significant difference, though, was the handling
> of tsq$, and it made the truncate much more expensive
> in undo and redo.
>
> Regards
>
> Jonathan Lewis
> -----------------------------------------------------------------
=====
Connor McDonald
Co-author: "Mastering Oracle PL/SQL - Practical Solutions"
ISBN: 1590592174
web: http://www.oracledba.co.uk
web: http://www.oaktable.net
email: connor_mcdonald@xxxxxxxxx
Coming Soon! "Oracle Insight - Tales of the OakTable"
"GIVE a man a fish and he will eat for a day. But TEACH him how
to fish, and...he will sit in a boat and drink beer all day"
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