Siebel System Admin, Install and Upgrade (MOSC)

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23.9 Patch Not Issuing Oracle Hints Needed For Fast OLTP Performance

in Siebel System Admin, Install and Upgrade (MOSC) 2 commentsAnswered


Hi All,

I know this sounds strange but in a test environment we are having really bad performance after applying 23.9. I can see the explain plan is doing hash joins and not doing first rows 10 optimization like it always has been doing ever since Siebel started supporting the CBO.

You can see from this screen shot that the SQL is coming from the Siebel object manager and is doing all rows optimization and doing hash joins.

These are the alter session commands we use to get our SQL sessions to match the alter commands issued by the Siebel object manager process.

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