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Offline reorg slowed performance

Running DB2 8.2.6 on AIX 5.3

I recently took on an assignment supporting a DB2 database which
supports a Siebel application.

Siebel version is 7.5.3 I have a reorg script that carefully follows
Siebel guidance on reorgs and have had great success with it at two
other locations.

Quick background; entire database had NEVER been reorged in 6 years
with only one table very occasionally been reorged. Siebel guidance on
reorg/runstats was ignored. Volatile tables that should not be
runstatted were. Reorgchk showed hundreds of tables needing reorg.

Post reorgchk shows data is now in very good condition however there
has been some slowing in OLTP performance. A db2rbind was issues as
part of the reorg with 143 packages being successfully rebound. A
flush package cache dynamic was also issued. This was an offline reorg
with no access allowed.

I am now researching possible causes for this degradation of
performance..

I am looking hard at the database server resources thinking that maybe
an optimized DB2 is overloading the server (Test).

Siebel is typically optimized for OLTP rather than batch so I don't
think that's the problem.

Any suggestions as to why this happened and/or what I can be looking
at would be appreciated.

Thanks in advance.

Gerry

May 7 '07 #1
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