RE: dbms_stats
Date: Wed, 3 Jun 2009 16:09:45 +0100
Message-ID: <A92AF970568F9A4BAB18E10F9C64ED605D0D2B7C51_at_EXCH2.morrisonsplc.co.uk>
In agreement with what others have said but doesn't analyze lock the table as well which is a definite no-no. It also does not have a parallel degree option.
-----Original Message-----
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Bradd Piontek
Sent: 03 June 2009 12:44
To: jaromir_at_db-nemec.com; mhdmehraj_at_gmail.com; oracle-l_at_freelists.org
Subject: Re: dbms_stats
I'd also rerun the dbms_stats call with 'cascade=true'. Leaping to the conclusion that analyze is better than dbms_stats using a couple queries and providing no metrics other then elapsed time isn't very good proof.
Bradd
On 6/3/09, jaromir nemec <jaromir_at_db-nemec.com> wrote:
> Hi,
>
>>
>> so from my test , i show analyze is better than DBMS_STATS..... Any
>> other ideas plz
>
> This shows first of all that the second test runs better then the first one.
> This could be a result of caching.
>
> I'd suggest:
>
> 1) run the selects with autotrace on to see if you have different
> execution plans
>
> 2) repeat the runs to see the ratio of logical and physical I/O (also
> visible in autotrace output)
>
> HTH
>
> Jaromir
>
>
>
> --
> http://www.freelists.org/webpage/oracle-l
>
>
>
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Bradd Piontek
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Received on Wed Jun 03 2009 - 10:09:45 CDT