Re: index + table monitoring performance

  • From: Edgar Chupit <chupit@xxxxxxxxx>
  • To: sjaffarhussain@xxxxxxxxx
  • Date: Wed, 14 Sep 2005 10:35:24 +0300

In 10g MONITORING clause is deprecated, and if you have
STATISTICS_LEVEL>BASIC all the segments are monitored.

From my observations performance degradation from MONITORING segments
is very low, because Oracle changes counters in memory and flushes
changes periodically (asynchronously). You can search archives, this
topic has been discussed here.

The data that is collected during monitoring of the segment is used by
the dbms_stat to determine if the segment statistics are staled and
should statistics be regathered, so there will be no effect from
monitoring segments with STALED statistics.

Please read this thread for more information:

And of course don't forget to test your ideas before implementing them
on the production servers.

On 9/14/05, The Human Fly <sjaffarhussain@xxxxxxxxx> wrote:
> Friends,
> We also planning to enable table monitoring on this schema to collect
> statistics  on table which has STALE statistics. Does this effect the
> performance?
> Thank you in advance
> --
> Best Regards,
> Syed Jaffar Hussain
> OCP 8i & 9i DBA,
> Banque Saudi Fransi,
> Saudi Arabia

Best regards,
  Edgar Chupit

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