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Re: Need help

From: Mogens Nørgaard <>
Date: Mon, 02 Jun 2003 22:44:41 -0800
Message-ID: <>

And you can do export/import of stats and change individual stats directly using dbms_stats. Way to go.

Jankovic, Djordje wrote:

> I have done some test before and found out that analyze is faster than
> dbms_stats for smaller tables only (less than 10M) - and the
> difference was not that big (for example very small tables dbms_stats
> would do a compute instead of estimate). For large tables they are
> pretty much the same. And this is comparing dbms_stats working in
> serial mode. You can do stuff in parallel which could change the
> picture in dbms_stats favor.
> dbms_stats is more accurate (since its introduction incorrect
> statistics gathering was discovered for ANALYZE), it supports better
> granularity control (partitions, subpartitions). Using dbms_stats you
> can also export and import statistics: save the old statistics before
> the run and reuse the old statistics in case you don't like the new ones.
> There are a number of other advantages: treating stale tables,
> automatic estimate sample size, collecting histogram info only for
> skewed columns (at least the ones that oracle thinks are skewed).
> Using dbms_stats you can also collect system stats.
> And analyze is not depreciated in 9i.
> AFAIK the only things dbms_stats does not do are: finding
> chained/migrated rows, computing cluster statistics, and validating
> the structure.
> Djordje
> -----Original Message-----
> From: Jayaram Keshava Murthy (Cognizant)
> []
> Sent: Monday, June 02, 2003 10:50 AM
> To: Multiple recipients of list ORACLE-L
> Subject: Need help
> Hi all,
> Can anyone tell me which of the following performs better
> in collecting statistics of a table:
> Analyze command or
> Dbms_stats.gather_table_stats
> I tried my queries with both the options -- but always
> Analyze is out-performing the dbms_stats.
> But i read in a document that Dbms_stats performs better !!
> Besides I also read that Analyze command will be deprecated from
> Oracle 9i.
> So can anyone tell me why dbms_stats is performing poor...
> Are there any paramters that need to be set to increase the
> performace of dbms_stats ?
> Thanks in advance.
> Regards
> Kesh

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Received on Tue Jun 03 2003 - 01:44:41 CDT

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