RE: Scripts for Rebuilding Indexes Nightly on Solaris

From: Post, Ethan <epost_at_kcc.com>
Date: Thu, 06 Sep 2001 17:33:21 -0700
Message-ID: <F001.00386053.20010906173524@fatcity.com>

I would add that using the MONITORING option is a great way to begin to look for tables that have indexes that might need rebuilding. You can query the DBA_TAB_MODIFICATIONS view to see what tables have a lot of delete/insert activity.

Ethan

>-----Original Message-----
>From: Walthour, Jon (GEAE, Compaq) [mailto:Jon.walthour_at_ae.ge.com]
>Sent: Thursday, September 06, 2001 12:25 PM
>To: Multiple recipients of list ORACLE-L
>Subject: RE: Scripts for Rebuilding Indexes Nightly on Solaris
>
>
>First off, checking on a regular basis for indexes that need
>rebuilding is
>fine, but don't rebuild all of them every night. Not only is
>it unnecessary,
>it can cause lots of problems. Only rebuild the indexes you
>need to--the
>ones who are significantly browned, have a significant percentage of
>deletes, or whose height is significant.
>
>Second, setting up a cron job is indeed a good idea. And David
>is right that
>you want to make sure to explicitly set up your environment,
>but not for the
>reason he suggests. The problem isn't that the job runs as
>root. If it were
>the case that every cron job on a UNIX box ran as root, then
>that would be a
>mighty big security hole. The issue is that when running a
>cron job, the
>account under which it runs does not automatically get its environment
>initialized by running .profile as it does when you log in. Thus, the
>environment must be specifically laid out.
>
>Hope this helps.
>
>Jon Walthour
>
>
>

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Author: Post, Ethan
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Received on Thu Sep 06 2001 - 19:33:21 CDT