使用oracle sql profile固定執行計劃
阿新 • • 發佈:2018-12-04
2013-02-05 16:19:36
標籤:
oracle sql profile
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- --1.準備階段
- SQL> select * from v$version;
- BANNER
- ----------------------------------------------------------------
- Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
- PL/SQL Release 10.2.0.1.0 - Production
- CORE 10.2.0.1.0 Production
- TNS for 32-bit Windows: Version 10.2.0.1.0 - Production
- NLSRTL Version 10.2.0.1.0 - Production
- SQL> create table test_raugher as select * from dba_objects;
- 表已建立。
- SQL> create index ind_objectid on test_raugher(object_id);
- 索引已建立。
- SQL> select object_id from test_raugher where rownum<2;
- OBJECT_ID
- ----------
- 20
- SQL> exec dbms_stats.gather_table_stats(user,'TEST_RAUGHER',cascade=>true);
- PL/SQL 過程已成功完成。
- --原sql執行計劃
- SQL> set autot trace explain
- SQL> select * from test_raugher where object_id=20;
- 執行計劃
- ----------------------------------------------------------
- Plan hash value: 800879874
- --------------------------------------------------------------------------------------------
- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
- --------------------------------------------------------------------------------------------
- | 0 | SELECT STATEMENT | | 1 | 95 | 2 (0)| 00:00:01 |
- | 1 | TABLE ACCESS BY INDEX ROWID| TEST_RAUGHER | 1 | 95 | 2 (0)| 00:00:01 |
- |* 2 | INDEX RANGE SCAN | IND_OBJECTID | 1 | | 1 (0)| 00:00:01 |
- --------------------------------------------------------------------------------------------
- Predicate Information (identified by operation id):
- ---------------------------------------------------
- 2 - access("OBJECT_ID"=20)
- SQL>
- --新sql執行計劃
- SQL> select /*+ full(test_raugher) */ * from test_raugher where object_id=20;
- 執行計劃
- ----------------------------------------------------------
- Plan hash value: 3725671026
- ----------------------------------------------------------------------------------
- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
- ----------------------------------------------------------------------------------
- | 0 | SELECT STATEMENT | | 1 | 95 | 166 (2)| 00:00:02 |
- |* 1 | TABLE ACCESS FULL| TEST_RAUGHER | 1 | 95 | 166 (2)| 00:00:02 |
- ----------------------------------------------------------------------------------
- Predicate Information (identified by operation id):
- ---------------------------------------------------
- 1 - filter("OBJECT_ID"=20)
- --2.獲取新sql的sql_id
- SQL> col sql_id for a20
- SQL> col sql_text for a100
- SQL> select sql_id,sql_text from v$sql where sql_text like '%full(test_raugher)%';
- SQL_ID SQL_TEXT
- -------------------- ----------------------------------------------------------------------------------------------------
- 5nkhk378705z3 select sql_id,sql_text from v$sql where sql_text like '%full(test_raugher)%'
- g23hbdmcsdahc select /*+ full(test_raugher) */ * from test_raugher where object_id=20
- dqp79vx5pmw0k EXPLAIN PLAN SET STATEMENT_ID='PLUS4294967295' FOR select /*+ full(test_raugher) */ * from test_raug
- her where object_id=20
- --3.獲取新sql的outline
- SQL> set pagesize 1000
- SQL> select * from table(dbms_xplan.display_cursor('g23hbdmcsdahc',null,'outline'));
- PLAN_TABLE_OUTPUT
- -----------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------
- SQL_ID g23hbdmcsdahc, child number 0
- -------------------------------------
- select /*+ full(test_raugher) */ * from test_raugher where object_id=20
- Plan hash value: 3725671026
- ----------------------------------------------------------------------------------
- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
- ----------------------------------------------------------------------------------
- | 0 | SELECT STATEMENT | | | | 166 (100)| |
- |* 1 | TABLE ACCESS FULL| TEST_RAUGHER | 1 | 95 | 166 (2)| 00:00:02 |
- ----------------------------------------------------------------------------------
- Outline Data
- -------------
- /*+
- BEGIN_OUTLINE_DATA
- IGNORE_OPTIM_EMBEDDED_HINTS
- OPTIMIZER_FEATURES_ENABLE('10.2.0.1')
- ALL_ROWS
- OUTLINE_LEAF(@"SEL$1")
- FULL(@"SEL$1" "TEST_RAUGHER"@"SEL$1")
- END_OUTLINE_DATA
- */
- Predicate Information (identified by operation id):
- ---------------------------------------------------
- 1 - filter("OBJECT_ID"=20)
- 已選擇31行。
- --4.建立sql profile(SQLPROFILE_001)
- SQL> declare
- 2 v_hints sys.sqlprof_attr;
- 3 begin
- 4 v_hints:=sys.sqlprof_attr(
- 5 'BEGIN_OUTLINE_DATA',
- 6 'IGNORE_OPTIM_EMBEDDED_HINTS',
- 7 'OPTIMIZER_FEATURES_ENABLE(''10.2.0.1'')',
- 8 'ALL_ROWS',
- 9 'OUTLINE_LEAF(@"SEL$1")',
- 10 'FULL(@"SEL$1" "TEST_RAUGHER"@"SEL$1")',
- 11 'END_OUTLINE_DATA');
- 12 dbms_sqltune.import_sql_profile(
- 13 'select * from test_raugher where object_id=20',
- 14 v_hints,'SQLPROFILE_001',
- 15 force_match=>true,replace=>false);
- 16 end;
- 17 /
- PL/SQL 過程已成功完成。
- --5.檢視是否使用sql profile
- SQL> set autot trace explain
- SQL> select * from test_raugher where object_id=20;
- 執行計劃
- ----------------------------------------------------------
- Plan hash value: 3725671026
- ----------------------------------------------------------------------------------
- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
- ----------------------------------------------------------------------------------
- | 0 | SELECT STATEMENT | | 1 | 95 | 166 (2)| 00:00:02 |
- |* 1 | TABLE ACCESS FULL| TEST_RAUGHER | 1 | 95 | 166 (2)| 00:00:02 |
- ----------------------------------------------------------------------------------
- Predicate Information (identified by operation id):
- ---------------------------------------------------
- 1 - filter("OBJECT_ID"=20)
- Note
- -----
- - SQL profile "SQLPROFILE_001" used for this statement
- SQL> select * from test_raugher where object_id=200;
- 執行計劃
- ----------------------------------------------------------
- Plan hash value: 3725671026
- ----------------------------------------------------------------------------------
- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
- ----------------------------------------------------------------------------------
- | 0 | SELECT STATEMENT | | 1 | 95 | 166 (2)| 00:00:02 |
- |* 1 | TABLE ACCESS FULL| TEST_RAUGHER | 1 | 95 | 166 (2)| 00:00:02 |
- ----------------------------------------------------------------------------------
- Predicate Information (identified by operation id):
- ---------------------------------------------------
- 1 - filter("OBJECT_ID"=200)
- Note
- -----
- - SQL profile "SQLPROFILE_001" used for this statement
- DBMS_SQLTUNE.IMPORT_SQL_PROFILE(
- sql_text => 'FULL QUERY TEXT',
- profile => sqlprof_attr('HINT SPECIFICATION WITH FULL OBJECT ALIASES'),
- name => 'PROFILE NAME',
- force_match => TRUE/FALSE,
- replace=> TRUE/FALSE);
sql_text用於指定sql的全文字,可查詢V$SQLAREA.SQL_FULLTEXT或DBA_HIST_SQLTEXT.SQL_TEXT獲得。
- BEGIN
- DBMS_SQLTUNE.DROP_SQL_PROFILE(name => 'PROFILE NAME');
- END;
- /
- SELECT name, created,category,sql_Text from dba_sql_profiles ORDER BY created DESC;
- SELECT sql_attr.attr_val outline_hints
- FROM dba_sql_profiles sql_profiles, sys.SQLPROF$ATTR sql_attr
- WHERE sql_profiles.signature = sql_attr.signature
- AND sql_profiles.name = 'SQLPROFILE_001'
- ORDER