Chuck
I think Jared has some excellent advice (as usual).
Interestingly, while you may need to lock the table while analyzing the
table, you may be able to rebuild it without locking it. According to the
Oracle Education notes, "Oracle8i introduced a method of re-creating and
existing index while allowing concurrent operations on the base table." The
syntax is
ALTER INDEX xxx REBUILD ONLINE;
or
ALTER INDEX xxx COALESCE;
If you really feel you must do something, the coalesce may be a lower-risk
solution. It won't lower the height, but as Jared points out, that may be of
only temporary value. Either way, I'd try it in test first.
Dennis Williams
DBA, 40%OCP, 100% DBA
Lifetouch, Inc.
[EMAIL PROTECTED]
-----Original Message-----
Sent: Tuesday, March 11, 2003 1:04 PM
To: Multiple recipients of list ORACLE-L
Chuck,
I've been convinced that rebuilding indexes is a waste of time.
In fact, it can cost you time, as rebuilding indexes can kill your
peformance while the indexes again seek their 'level'.
Check into at asktom.oracle.com. There's some good examples.
jared
"Chuck Hamilton" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
03/11/2003 06:30 AM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
cc:
Subject: Analyzing indexes
I need to determine whether or not a couple of indexes need to be rebuilt.
The problem is the indexes are quite large and on a 24x7 high volume
database. If I try to run an "analyze validate structure" to gather the
data
I need to make that decision, it sets a lock on the table for about an
hour
which I can't afford to do. There is no slow time when I can do this and
management has said before they're not going to spring for the
partitioning
option to break the indexes up into managable pieces. Is there some other
way I can get the information needed to determine if an index needs to be
rebuilt or not without setting a lock on the table? We are on Oracle
8.1.7.
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