ignore the global settings of advice

Hi all

I know that I can put "ignore the advice" for the current session.

Is it possible to put it globally for all sessions?

ALTER session set '_optimizer_ignore_hints' = TRUE;

works for me, at the level of the session or the instance:

orclz > alter system set '_optimizer_ignore_hints' = false;

Modified system.

orclz > select / * + full (emp) * / * from emp where empno = 1000;

no selected line

Execution plan

----------------------------------------------------------

Hash value of plan: 3956160932

--------------------------------------------------------------------------

| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |

--------------------------------------------------------------------------

|   0 | SELECT STATEMENT |      |     1.    38.     3 (0) | 00:00:01 |

|*  1 |  TABLE ACCESS FULL | EMP |     1.    38.     3 (0) | 00:00:01 |

--------------------------------------------------------------------------

Information of predicates (identified by the operation identity card):

---------------------------------------------------

1 - filter ("EMPNO" = 1000)

orclz > alter system set '_optimizer_ignore_hints' = TRUE;

Modified system.

orclz > select * from emp where empno = 1000;

no selected line

Execution plan

----------------------------------------------------------

Hash value of plan: 2949544139

--------------------------------------------------------------------------------------

| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |

--------------------------------------------------------------------------------------

|   0 | SELECT STATEMENT |        |     1.    38.     1 (0) | 00:00:01 |

|   1.  TABLE ACCESS BY INDEX ROWID | EMP |     1.    38.     1 (0) | 00:00:01 |

|*  2 |   INDEX UNIQUE SCAN | PK_EMP |     1.       |     0 (0) | 00:00:01 |

--------------------------------------------------------------------------------------

Information of predicates (identified by the operation identity card):

---------------------------------------------------

2 - access ("EMPNO" = 1000)

orclz > select / * + full (emp) * / * from emp where empno = 1000;

no selected line

Execution plan

----------------------------------------------------------

Hash value of plan: 2949544139

--------------------------------------------------------------------------------------

| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |

--------------------------------------------------------------------------------------

|   0 | SELECT STATEMENT |        |     1.    38.     1 (0) | 00:00:01 |

|   1.  TABLE ACCESS BY INDEX ROWID | EMP |     1.    38.     1 (0) | 00:00:01 |

|*  2 |   INDEX UNIQUE SCAN | PK_EMP |     1.       |     0 (0) | 00:00:01 |

--------------------------------------------------------------------------------------

Information of predicates (identified by the operation identity card):

---------------------------------------------------

2 - access ("EMPNO" = 1000)

orclz >

orclz >

Post edited by: JohnWatson

Update: corrected the police.

Tags: Database

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