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Implementing Siebel eBusiness Applications on DB2 UDB for OS/390 and z/OS > Migrating Data Using Siebel EIM > Considerations for EIM Tables >
Updating the S_LST_OF_VAL Table
The BU_ID column in the S_LST_OF_VAL base table can have only one or very few distinct values. When this happens, the DB2 optimizer often needlessly performs a table scan through all rows in the S_LST_OF_VAL table.
To avoid this problem and speed up the query, modify the statistics data by running the following SQL statements:
update sysibm.sysindexes set firstkeycardf=1000 where
name='S_LST_OF_VAL_M2';
update sysibm.syscolumns set colcardf = 1000 where
tbname='S_LST_OF_VAL' and name='BU_ID';
NOTE: Depending on the data you are working with, you might need to run other SQL statements ahead of time.
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Implementing Siebel eBusiness Applications on DB2 UDB for OS/390 and z/OS Published: 18 April 2003 |