如何利用sqlprofile固定执行计划并将执行计划导入到新库
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1 实验环境
Linux 11G R2 导入到 windows 11G R2
源库：
SQL> select * from v$version; BANNER -------------------------------------------------------------------------------- Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production PL/SQL Release 11.2.0.4.0 - Production CORE 11.2.0.4.0 Production TNS for Linux: Version 11.2.0.4.0 - Production NLSRTL Version 11.2.0.4.0 - Production
目标库：
SQL> select * from v$version; BANNER -------------------------------------------------------------------------------- Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production PL/SQL Release 11.2.0.4.0 - Production CORE 11.2.0.4.0 Production TNS for 64-bit Windows: Version 11.2.0.4.0 - Production NLSRTL Version 11.2.0.4.0 - Production
1.1 创建表
SQL> conn lei/lei Connected. SQL> create table tt as select * from dba_objects; Table created. SQL> create index idex_01 on tt(object_id); Index created.
1.2 收集统计信息
SQL> exec dbms_stats.gather_table_stats('LEI','TT',cascade=>true);
PL/SQL procedure successfully completed.1.3 生成执行计划
SQL> explain plan for select object_NAME FROM TT WHERE object_id=2;
Exlained.
SQL> select * from table(dbms_xplan.display());
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
Plan hash value: 2974445191
--------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 30 | 2 (0)| 00:00:01 |
| 1 | TABLE ACCESS BY INDEX ROWID| TT | 1 | 30 | 2 (0)| 00:00:01 |
|* 2 | INDEX RANGE SCAN | IDEX_01 | 1 | | 1 (0)| 00:00:01 |
--------------------------------------------------------------------------------
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - access("OBJECT_ID"=2)
14 rows selected.可以看到是走索引的。
1.4 使用HINT改变执行计划
SQL> select /*+ full(tt) */* from tt where object_id=2; OWNER ------------------------------ OBJECT_NAME -------------------------------------------------------------------------------- SUBOBJECT_NAME OBJECT_ID DATA_OBJECT_ID OBJECT_TYPE ------------------------------ ---------- -------------- ------------------- CREATED LAST_DDL_ TIMESTAMP STATUS T G S NAMESPACE --------- --------- ------------------- ------- - - - ---------- EDITION_NAME ------------------------------ SYS C_OBJ# 2 2 CLUSTER OWNER ------------------------------ OBJECT_NAME -------------------------------------------------------------------------------- SUBOBJECT_NAME OBJECT_ID DATA_OBJECT_ID OBJECT_TYPE ------------------------------ ---------- -------------- ------------------- CREATED LAST_DDL_ TIMESTAMP STATUS T G S NAMESPACE --------- --------- ------------------- ------- - - - ---------- EDITION_NAME ------------------------------ 24-AUG-13 24-AUG-13 2013-08-24:11:37:35 VALID N N N 5
1.5 查看outline
SQL> explain plan for select /*+ full(tt) */* from tt where object_id=2;
Explained.
SQL> select * from table(dbms_xplan.display(null,null,'outline'));
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Plan hash value: 264906180
--------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 98 | 344 (1)| 00:00:05 |
|* 1 | TABLE ACCESS FULL| TT | 1 | 98 | 344 (1)| 00:00:05 |
--------------------------------------------------------------------------
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
/*+
BEGIN_OUTLINE_DATA
FULL(@"SEL$1" "TT"@"SEL$1")
OUTLINE_LEAF(@"SEL$1")
ALL_ROWS
DB_VERSION('11.2.0.4')
OPTIMIZER_FEATURES_ENABLE('11.2.0.4')
IGNORE_OPTIM_EMBEDDED_HINTS
END_OUTLINE_DATA
*/
PLAN_TABLE_OUTPUT
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - filter("OBJECT_ID"=2)
27 rows selected.1.6 生成sql profile
SQL> declare
v_hints sys.sqlprof_attr;
begin
v_hints := sys.sqlprof_attr('FULL(@"SEL$1" "TT"@"SEL$1")'); --从上面获得
dbms_sqltune.import_sql_profile('select * from tt where object_id= 2', --sql语句
v_hints, 'TT_LEI_20170510', --profile名称
force_match => true);
end;
/ 8 9 10
PL/SQL procedure successfully completed.1.7 查看profile是否生效
SQL> explain plan for select * from tt where object_id=2;
Explained.
SQL> select * from table(dbms_xplan.display);
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Plan hash value: 264906180
--------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 98 | 344 (1)| 00:00:05 |
|* 1 | TABLE ACCESS FULL| TT | 1 | 98 | 344 (1)| 00:00:05 |
--------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1 - filter("OBJECT_ID"=2)
Note
--------
- SQL profile "TT_LEI_20170510" used for this statement
17 rows selected.可以看到已经生效了。
2 导出表和打包执行计划
2.1 打包执行计划
SQL> exec DBMS_SQLTUNE.CREATE_STGTAB_SQLPROF(table_name=>'TEST_TT_PROFILE1',schema_name=>'LEI'); PL/SQL procedure successfully completed. SQL> exec DBMS_SQLTUNE.PACK_STGTAB_SQLPROF(staging_table_name =>'TEST_TT_PROFILE1',profile_name=>'TT_LEI_20170510'); PL/SQL procedure successfully completed
名称随便。
更多关于DBMS_SQLTUNE.CREATE_STGTAB_SQLPROF的说明，请查看官方文档：
http://docs.oracle.com/cd/B28359_01/appdev.111/b28419/d_sqltun.htm#CACBCEEH
2.2 导出用户LEI
[oracle@dg-p ~]$ expdp system/oracle dumpfile=tt.dmp directory=lei_dir schemas=lei Export: Release 11.2.0.4.0 - Production on Wed May 10 20:09:28 2017 Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options Starting "SYSTEM"."SYS_EXPORT_SCHEMA_01": system/******** dumpfile=tt.dmp directory=lei_dir schemas=lei Estimate in progress using BLOCKS method... Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA Total estimation using BLOCKS method: 10.18 MB Processing object type SCHEMA_EXPORT/USER Processing object type SCHEMA_EXPORT/SYSTEM_GRANT Processing object type SCHEMA_EXPORT/ROLE_GRANT Processing object type SCHEMA_EXPORT/DEFAULT_ROLE Processing object type SCHEMA_EXPORT/PRE_SCHEMA/PROCACT_SCHEMA Processing object type SCHEMA_EXPORT/TABLE/TABLE Processing object type SCHEMA_EXPORT/TABLE/INDEX/INDEX Processing object type SCHEMA_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS Processing object type SCHEMA_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS . . exported "LEI"."TT" 8.366 MB 86269 rows . . exported "LEI"."TEST_TT_PROFILE1" 22.02 KB 1 rows Master table "SYSTEM"."SYS_EXPORT_SCHEMA_01" successfully loaded/unloaded ****************************************************************************** Dump file set for SYSTEM.SYS_EXPORT_SCHEMA_01 is: /u01/backup/tt.dmp Job "SYSTEM"."SYS_EXPORT_SCHEMA_01" successfully completed at Wed May 10 20:09:40 2017 elapsed 0 00:00:12
2.3 导入到新环境
2.3.1 创建用户
SQL> create user lei identified by lei; 用户已创建。 SQL> grant dba,resource,connect to lei; 授权成功。 SQL> C:/Users/Administrator>impdp system/oracle dumpfile=tt.dmp directory=lei_dir schemas=LEI Import: Release 11.2.0.4.0 - Production on 星期三 5月 10 12:05:09 2017 Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved. 连接到: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options 已成功加载/卸载了主表 "SYSTEM"."SYS_IMPORT_SCHEMA_01" 启动 "SYSTEM"."SYS_IMPORT_SCHEMA_01": system/******** dumpfile=tt.dmp directory=lei_dir schemas=LEI 处理对象类型 SCHEMA_EXPORT/USER ORA-31684: 对象类型 USER:"LEI" 已存在 处理对象类型 SCHEMA_EXPORT/SYSTEM_GRANT 处理对象类型 SCHEMA_EXPORT/ROLE_GRANT 处理对象类型 SCHEMA_EXPORT/DEFAULT_ROL 处理对象类型 SCHEMA_EXPORT/PRE_SCHEMA/PROCACT_SCHEMA 处理对象类型 SCHEMA_EXPORT/TABLE/TABLE 处理对象类型 SCHEMA_EXPORT/TABLE/TABLE_DATA . . 导入了 "LEI"."TT" 8.366 MB 86269 行 . . 导入了 "LEI"."TEST_TT_PROFILE1" 22.02 KB 1 行 处理对象类型 SCHEMA_EXPORT/TABLE/INDEX/INDEX 处理对象类型 SCHEMA_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STAISTICS 处理对象类型 SCHEMA_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS 作业 "SYSTEM"."SYS_IMPORT_SCHEMA_01" 已经完成, 但是有 1 个错误 (于 星期三 5月 10 12:05:12 2017 elapsed 0 00:00:03 完成)
2.3.2 查看新库中的执行计划
SQL> conn lei/lei
已连接。
SQL> explain plan for select * from tt where object_id=2;
已解释。
SQL> select * from table(dbms_xplan.display());
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
Plan hash value: 2974445191
----------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
---------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 98 | 2 (0)| 00:00:01 |
| 1 | TABLE ACCESS BY INDEX ROWID| TT | 1 | 98 | 2 (0)| 00:00:01 |
|* 2 | INDEX RANGE SCAN | IDEX_01 | 1 | | 1 (0)| 00:00:01 |
---------------------------------------------------------------------------------------
PLAN_TABLE_OUTPUT
---------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - access("OBJECT_ID"=2)
已选择14行。可以看到默认还是走索引。
2.3.3 解包sqlprofile,执行计划变更为与源库一样的执行计划。
SQL> EXEC DBMS_SQLTUNE.UNPACK_STGTAB_SQLPROF(replace => TRUE,staging_table_name => 'TEST_TT_PROFILE1'); PL/SQL 过程已成功完成。
2.3.4 再次查看执行计划
SQL> explain plan for select * from tt where object_id=2;
已解释。
SQL> select * from table(dbms_xplan.display());
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
Plan hash value: 264906180
--------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 98 | 344 (1)| 00:00:05 |
|* 1 | TABLE ACCESS FULL| TT | 1 | 98 | 344 (1)| 00:00:05 |
--------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
1 - filter("OBJECT_ID"=2)
Note
-----
- SQL profile "TT_LEI_20170510" used for this statement
已选择17行。可以看到，执行计划已经使用profile，走了全表扫描。
到此实验结束。
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