7/18/2019 Note 1454675 - _FIX_CONTROL Parameters Are Ignored

http://slidepdf.com/reader/full/note-1454675-fixcontrol-parameters-are-ignored 1/2

10.10.2013 Page 1 of 2

  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

7/18/2019 Note 1454675 - _FIX_CONTROL Parameters Are Ignored

http://slidepdf.com/reader/full/note-1454675-fixcontrol-parameters-are-ignored 2/2

10.10.2013 Page 2 of 2

  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