怎样使用oracle 的DBMS_SQLTUNE package 来执行 Sql Tuning Advisor 进行sql 自己主动调优
1》。这里简单举个样例来说明DBMS_SQLTUNE 的使用
首先现运行下某个想要调优的sql，然后获取sqlid
SQL> select * from v$sqltext where sql_text like ‘select * from dual%‘;
ADDRESS HASH_VALUE SQL_ID COMMAND_TYPE PIECE SQL_TEXT
---------------- ---------- ------------- ------------ ---------- ----------------------------------------------------------------
0000000069BC2BE0 942515969 a5ks9fhw2v9s1 3 0 select * from dual
1 row selected.
2》。执行sqltrpt 脚本
sqltrpt 里默认记录两种数据
15 Most expensive SQL in the cursor cache
15 Most expensive SQL in the workload repository
当然这里我们也能够手动输入我们想要调整的其它sql
SQL> @?/rdbms/admin/sqltrpt
15 Most expensive SQL in the cursor cache
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
SQL_ID ELAPSED SQL_TEXT_FRAGMENT
------------- ---------- -------------------------------------------------------
b6usrg82hwsa3 97.69 call dbms_stats.gather_database_stats_job_proc ( )
6gvch1xu9ca3g 38.88 DECLARE job BINARY_INTEGER := :job; next_date DATE := :
cvn54b7yz0s8u 21.34 select /*+ index(idl_ub1$ i_idl_ub11) +*/ piece#,length
dbvkky621gqtr 16.22 SELECT /*+ parallel */ EXTRACTVALUE(VALUE(T), ‘/select_
3ktacv9r56b51 9.68 select owner#,name,namespace,remoteowner,linkname,p_tim
ga9j9xk5cy9s0 7.01 select /*+ index(idl_sb4$ i_idl_sb41) +*/ piece#,length
39m4sx9k63ba2 6.09 select /*+ index(idl_ub2$ i_idl_ub21) +*/ piece#,length
8swypbbr0m372 5.90 select order#,columns,types from access$ where d_obj#=:
db78fxqxwxt7r 5.62 select /*+ rule */ bucket, endpoint, col#, epvalue from
g5m0bnvyy37b1 5.38 select sql_id, plan_hash_value, bucket_id, begin
424h0nf7bhqzd 5.02 SELECT sqlset_row(sql_id, force_matching_signature,
SQL_ID ELAPSED SQL_TEXT_FRAGMENT
------------- ---------- -------------------------------------------------------
32hbap2vtmf53 4.31 select position#,sequence#,level#,argument,type#,charse
9s0xa5dgvuq55 4.29 DECLARE job BINARY_INTEGER := :job; next_date TIMESTAM
d4taszv1bpc0w 4.02 DECLARE cnt NUMBER; bid NUMBER; eid
96g93hntrzjtr 3.78 select /*+ rule */ bucket_cnt, row_cnt, cache_cnt, null
15 Most expensive SQL in the workload repository
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
SQL_ID ELAPSED
------------- ----------
SQL_TEXT_FRAGMENT
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
b6usrg82hwsa3 198.03
call dbms_stats.gather_database_stats_job_proc ( )
6gvch1xu9ca3g 169.58
DECLARE job BINARY_INTEGER := :job; next_date DATE := :
1jqcpqf8fpdr8 139.13
select count(*) from dba_objects a, dba_objects b where
SQL_ID ELAPSED
------------- ----------
SQL_TEXT_FRAGMENT
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
cvn54b7yz0s8u 82.99
select /*+ index(idl_ub1$ i_idl_ub11) +*/ piece#,length
f6cz4n8y72xdc 63.29
SELECT space_usage_kbytes FROM v$sysaux_occupants WH
6mcpb06rctk0x 44.62
call dbms_space.auto_space_advisor_job_proc ( )
SQL_ID ELAPSED
------------- ----------
SQL_TEXT_FRAGMENT
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
3ktacv9r56b51 42.79
select owner#,name,namespace,remoteowner,linkname,p_tim
12a2xbmwn5v6z 39.87
select owner, segment_name, blocks from dba_segments wh
05s9358mm6vrr 37.59
begin dbms_feature_usage_internal.exec_db_usage_samplin
SQL_ID ELAPSED
------------- ----------
SQL_TEXT_FRAGMENT
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
5zruc4v6y32f9 33.12
DECLARE job BINARY_INTEGER := :job; next_date TIMESTAM
dbvkky621gqtr 31.66
SELECT /*+ parallel */ EXTRACTVALUE(VALUE(T), ‘/select_
63n9pwutt8yzw 28.03
MERGE /*+ dynamic_sampling(ST 4) dynamic_sampling_est_c
SQL_ID ELAPSED
------------- ----------
SQL_TEXT_FRAGMENT
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
7xa8wfych4mad 27.86
SELECT SUM(blocks) FROM x$kewx_segments WHERE segment
8swypbbr0m372 26.81
select order#,columns,types from access$ where d_obj#=:
db78fxqxwxt7r 26.37
select /*+ rule */ bucket, endpoint, col#, epvalue from
Specify the Sql id
~~~~~~~~~~~~~~~~~~
Enter value for sqlid: a5ks9fhw2v9s1
Sql Id specified: a5ks9fhw2v9s1
Tune the sql -----------------------------------------------这里为sql tuning advisor 的 建议
~~~~~~~~~~~~
GENERAL INFORMATION SECTION
-------------------------------------------------------------------------------
Tuning Task Name : TASK_219
Tuning Task Owner : SYS
Workload Type : Single SQL Statement
Scope : COMPREHENSIVE
Time Limit(seconds): 1800
Completion Status : COMPLETED
Started at : 05/17/2014 17:07:54
Completed at : 05/17/2014 17:07:54
-------------------------------------------------------------------------------
Schema Name: SYS
SQL ID : a5ks9fhw2v9s1
SQL Text : select * from dual
-------------------------------------------------------------------------------
There are no recommendations to improve the statement.
-------------------------------------------------------------------------------
备注：在生产环境下没有測试过，不知道Sql Tuning Advisor 的效果怎样，这个有待然后验证下！