Tip

Generating update statistics

I developed this based on the tip Generating reorg statements for all tables submitted by Prashant Dahalkar 4 Dec 2002. Prashant was addressing reorg in his script; this addresses stats. It will provide an output file for updating statistics as needed. By combining what Prashant developed with this, it should help ease some of the database maintenance.

This was developed and tested on DB2 7.1 FixPak 3 (aka 7.2) on the Windows 2000 platform. It should also work on the other platforms (Linux, UNIX) as well since it uses system tables and fairly standard SQL.

The following SQL will create a script for running full statistics on databases, just add the appropriate information in the area and edit the export file (e.g "D:\Stats.txt") name and location as needed. The ' WITH DISTRIBUTION AND DETAILED INDEX' can be changed as needed to support processing needs. The first example excludes the IBM provided schemas, the second lets you specify a schema.

connect to <DATABASE> user <USER ID> using <PASSWORD>;
export to D:\Stats.txt of del
select 'runstats on table '  || TABSCHEMA || '.' || TABNAME  ||  ' WITH
DISTRIBUTION AND DETAILED INDEX;'
from syscat.tables
where tabschema not in 'SYSCAT  ' and
tabschema not in 'SYSIBM  ' and
tabschema not in '<USER DEFINED SCHEMAS OR OTHER EXCLUSIONS (e.g. QUEST)>'
and
tabschema not in 'SYSSTAT ' and
tabschema not in 'DB2DBG  ' and
tabschema not in 'DB2ADMIN';
Or if you only want to reorg for a specific schema:
connect to <DATABASE> user <USER ID> using <PASSWORD>;
export to D:\Stats.txt of del
select 'runstats on table '  || TABSCHEMA || '.' || TABNAME  ||  ' WITH
DISTRIBUTION AND DETAILED INDEX;'
from syscat.tables
where tabschema in '<SCHEMA NAME>';
When done, just use a text editor (I used Wordpad) to remove the " marks and replace with nothing.

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This was first published in February 2003

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