One thing to remember is b-tree indexes settle at 75% efficiency very
quickly and sit there. You can never keep a b-tree index at 100%
efficiency.
But if your db is small enough to rebuild indexes nightly, well I guess you
can.
"Do not criticize someone until you walked a mile in their shoes, that way
when you criticize them, you are a mile a way and have their shoes."
Christopher R. Spence
Oracle DBA
Phone: (978) 322-5744
Fax: (707) 885-2275
Fuelspot
73 Princeton Street
North, Chelmsford 01863
-----Original Message-----
Sent: Thursday, September 06, 2001 3:25 PM
To: Multiple recipients of list ORACLE-L
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
-----Original Message-----
Sent: Thursday, September 06, 2001 1:33 PM
To: Multiple recipients of list ORACLE-L
David -
Use cron. Nightly might be excessive. Kick off a shell script (remember
that cron executes as root, so you need to set your environment) and create
your own script dynamically (following code is use for backups also) in a
manner like:
rebuild_index.sh
#!/bin/ksh
export PATH=$PATH:/u001/app/oracle/product/8.1.7/bin
export ORACLE_SID=ifas
export PATH=$PATH:/$ORACLE_HOME/bin
export ORACLE_HOME=/u001/app/oracle/product/8.1.7
export ORACLE_BASE=/u001/app/oracle
sqlplus <<either use a password protection scheme or hardcode your access
here> <<username>/<password>>> @/usr/local/bin/rebuild_index
exit
rebuild_index.sql
spool rebuild_index.sql
Select 'Alter index ' || index_name || ' rebuild;' from dba_indexes; #
add selection caveats if desired
spool off
!chmod 777 /u014/oradata/ifastrn/rebuild_index.sql
@/u014/oradata/ifastrn/rebuild_index
exit
Lots of variations possible.
David A. Barbour
Oracle DBA, OCP
AISD
512-414-1002
Kimberly Smith
<[EMAIL PROTECTED] To: Multiple recipients
of list ORACLE-L <[EMAIL PROTECTED]>
jitsu.com> cc:
Sent by: Subject: RE: Scripts
for Rebuilding Indexes Nightly on Solaris
[EMAIL PROTECTED]
09/06/2001 11:57 AM
Please respond to
ORACLE-L
Nightly? That is a lot. Are you really entering that much data on a daily
basis?
-----Original Message-----
From: David Wagoner [mailto:[EMAIL PROTECTED]]
Sent: Thursday, September 06, 2001 8:57 AM
To: Multiple recipients of list ORACLE-L
Subject: Scripts for Rebuilding Indexes Nightly on Solaris
Does anyone have any good scripts for rebuilding indexes nightly on
Solaris UNIX that they'd be willing to share? Also, in your
experience is it better to run this through UNIX cron jobs than using
the Oracle OEM job scheduler? I suspect the cron job will be the
favorable answer.
Thanks in advance,
David Wagoner
Oracle DBA
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