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Tag Archives: siebel performance issues

Siebel Database optimization – Hidden init.ora parameter “_always_semi_join”

A Siebel Query with a Subquery is very Slow in an Oracle CBO Siebel Environment. The Slow Performance was improved by using the Hidden init.ora parameter “_always_semi_join”   SYMPTOMS Performance problems are observed within the system. A certain query is taking, on average, 7 minutes to be returned. The DBA has run that query exactly

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