note 1454675 - _fix_control parameters are ignored
DESCRIPTION
notaTRANSCRIPT
7/18/2019 Note 1454675 - _FIX_CONTROL Parameters Are Ignored
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SAP Note 1454675 - _FIX_CONTROL parameters are ignored
Note Language: English Version: 4 Validity: Valid Since 10.11.2010
Summary
Symptom
Performance problems occur that should be solved by setting the parameter
"_fix_control" (seemingly correctly).
v$parameter2 displays the various _fix_control values as they are set in
the parameter file.
On the other hand, v$system_fix_control displays the default values of
certain parameters.
Other terms
_fix_control , v$system_fix_control , CBO, cost-based optimizer, bug
9539556, Oracle
Reason and Prerequisites
Oracle bug 9539556
In the parameter file, _fix_control values are permitted to be set only for
bug fixes that are listed in v$system_fix_control-bugno.
In the parameter file, a _fix_control value is set for a bug fix that is
not listed in v$system_fix_control-bugno.
As a result, the system may ignore all of the "_fix_control" parameter
values that follow the value that is set incorrectly and, therefore,
performance problems may occur.
Oracle bug 9539556 was opened for this problem.
Solution
Check the correctness of the values for "_fix_control".
The only bugs that are permitted to be referenced are those that are
installed and that exist in v$system_fix_control:
SQL> select bugno from v$system_fix_control;
The automatic parameter check (see Note 1171650) checks this and issues a
warning ("_fix_control Check: not reliable ...") with reference to this
note if _fix_controls that are not permitted are used.
The fix for bug 9539556 is contained as part of the optimizer merge fix as
of the SAP Bundle Patches (SBPs) listed below:
Patch 10078864 (CBO Merge Patch) - added in SBP 10.2.0.4.5 201010
Patch 10100270 (CBO Merge Patch) - added in SBP 10.2.0.5.1 201011
Patch 10007936 (CBO Merge Patch) - added in SBP 11.2.0.1.2 201009
The fix for bug 9539556 is contained as of Oracle Version 11.2.0.2.0.
Header Data
Release Status: Released for Customer
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SAP Note 1454675 - _FIX_CONTROL parameters are ignored
Released on: 10.11.2010 14:57:54
Master Language: German
Priority: Correction with high priority
Category: External error
Primary Component: BC-DB-ORA Oracle
Secondary Components:
BW-SYS-DB-ORA BW ORACLE
The Note is release-independent
Related Notes
Number Short Text
1455168 _FIX_CONTROL syntax
1289199 Information about Oracle parameters