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".
(Doc ID 511886.1)
Last updated on APRIL 15, 2021
Applies to:Siebel CRM - Version 7.7.2  and later
Siebel Tools - Version 7.7.2 SIA  to 126.96.36.199 SIA  [Release V7 to V8]
z*OBSOLETE: Microsoft Windows Server 2003
Product Release: V7 (Enterprise), V8 (Enterprise)
Version: 7.7.2  Fin Svcs to 188.8.131.52 SIA 
Database: Oracle 9i
Application Server OS: Microsoft Windows 2003 Server
Database Server OS: IBM AIX 5L 5.1
This document was previously published as Siebel SR 38-1781145701.
""Checked for relevance on 28-Feb-2014""
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 as it came out of Siebel using the bind variables within a script. That script ran in seconds. It appears as though, when running from the system, there is a very large timeframe for gaps with no activity and waited idle time. The amount of time spent at the database level is minimal. .
To view full details, sign in with your My Oracle Support account.
Don't have a My Oracle Support account? Click to get started!
In this Document