使用sqltrpt自动调优sql。

在10gR2中,提供了$ORACLE_HOME/rdbms/admin/sqltrpt.sql脚本,用于抽取占用资源较多的sql,并可以为指定的sql生成执行计划,资源占用较多的sql分为两部分
1) 15 Most expensive SQL in the cursor cache

2) 15 Most expensive SQL in the workload repository

sys@ORCL> conn /as sysdba
已连接。
sys@ORCL> set linesize 200;
sys@ORCL> @?/rdbms/admin/sqltrpt.sql

15 Most expensive SQL in the cursor cache
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

SQL_ID           ELAPSED SQL_TEXT_FRAGMENT
------------- ---------- -------------------------------------------------------
b6usrg82hwsa3      52.54 call dbms_stats.gather_database_stats_job_proc (  )
572fbaj0fdw2b      21.16 select output from table(dbms_workload_repository.awr_r
59v4zh1ac3v2a      14.61 DECLARE job BINARY_INTEGER := :job;  next_date TIMESTAM
2tr12b1b8uj71       8.69 MERGE /*+ dynamic_sampling(ST 4) dynamic_sampling_est_c
6mcpb06rctk0x       7.58 call dbms_space.auto_space_advisor_job_proc (  )
63kf3an2j0pkc       5.31 insert into sys.wri$_optstat_histgrm_history (obj#,intc
c0j6cx9kzjf7g       4.89 SELECT EXTRACTVALUE(VALUE(T), '/select_list_item/pos')
62yyzw3309d6a       3.89 SELECT VALUE FROM V$SESSION_FIX_CONTROL WHERE BUGNO = :
cvn54b7yz0s8u       3.01 select /*+ index(idl_ub1$ i_idl_ub11) +*/ piece#,length
4y1y43113gv8f       2.72 delete from histgrm$ where obj#=:1 and intcol#=:2 and r
dayq182sk41ks       2.55 insert into wrh$_memory_target_advice   (snap_id, dbid,
bm2pwrpcr8ru6       2.53 select sga_size s,           sga_size_factor * 100 f,
advr729cu0627       2.51 select * from (  select stat.sql_id as sql_id, sum(elap
bunssq950snhf       2.49 insert into wrh$_sga_target_advice   (snap_id, dbid, in
43ruajmwv9fus       2.41 insert into histgrm$(obj#,intcol#,row#,bucket,endpoint,

15 Most expensive SQL in the workload repository
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

SQL_ID           ELAPSED SQL_TEXT_FRAGMENT
------------- ---------- --------------------------------------------------------------------------------------------------------------
b6usrg82hwsa3     238.62 call dbms_stats.gather_database_stats_job_proc (  )
59v4zh1ac3v2a     121.83 DECLARE job BINARY_INTEGER := :job;  next_date TIMESTAM
db78fxqxwxt7r      81.03 select /*+ rule */ bucket, endpoint, col#, epvalue from
f6cz4n8y72xdc      70.19 SELECT space_usage_kbytes  FROM  v$sysaux_occupants  WH
6mcpb06rctk0x      67.76 call dbms_space.auto_space_advisor_job_proc (  )
5jvf84zg4c49n      67.39  select s.synonym_name as object_name, o.object_type
cvn54b7yz0s8u      59.87 select /*+ index(idl_ub1$ i_idl_ub11) +*/ piece#,length
gqbsq1gpca1gh      52.65 declare   logoff_sid  pls_integer;   logoff_time date :
3ktacv9r56b51      48.01 select owner#,name,namespace,remoteowner,linkname,p_tim
8szmwam7fysa3      43.19 insert into wri$_adv_objspace_trend_data select timepoi
12a2xbmwn5v6z      41.41 select owner, segment_name, blocks from dba_segments wh
c2p32r5mzv8hb      41.28 BEGIN    prvt_advisor.delete_expired_tasks;  END;
2tr12b1b8uj71      36.90 MERGE /*+ dynamic_sampling(ST 4) dynamic_sampling_est_c
ga6ja2d04ycbm      33.30 DECLARE job BINARY_INTEGER := :job;  next_date TIMESTAM
62yyzw3309d6a      33.25 SELECT VALUE FROM V$SESSION_FIX_CONTROL WHERE BUGNO = :

Specify the Sql id
~~~~~~~~~~~~~~~~~~
输入 sqlid 的值:  8szmwam7fysa3

Sql Id specified: 8szmwam7fysa3

Tune the sql
~~~~~~~~~~~~

GENERAL INFORMATION SECTION
-------------------------------------------------------------------------------
Tuning Task Name   : 任务_832
Tuning Task Owner  : SYS
Workload Type      : Single SQL Statement
Scope              : COMPREHENSIVE
Time Limit(seconds): 1800
Completion Status  : COMPLETED
Started at         : 11/19/2013 22:17:00
Completed at       : 11/19/2013 22:17:00

-------------------------------------------------------------------------------
Schema Name: SYS
SQL ID     : 8szmwam7fysa3
SQL Text   : insert into wri$_adv_objspace_trend_data select timepoint,
             space_usage, space_alloc, quality from
             table(dbms_space.object_growth_trend(:1, :2, :3, :4, NULL, NULL,
              NULL, 'FALSE', :5, 'FALSE'))

-------------------------------------------------------------------------------
FINDINGS SECTION (1 finding)
-------------------------------------------------------------------------------

1- Statistics Finding
---------------------
  尚未分析表 "SYS"."WRI$_ADV_OBJSPACE_TREND_DATA"。

  Recommendation
  --------------
  - 考虑收集此表的优化程序统计信息。
    execute dbms_stats.gather_table_stats(ownname => 'SYS', tabname =>
            'WRI$_ADV_OBJSPACE_TREND_DATA', estimate_percent =>
            DBMS_STATS.AUTO_SAMPLE_SIZE, method_opt => 'FOR ALL COLUMNS SIZE
            AUTO');

  Rationale
  ---------
    为了选择好的执行计划, 优化程序需要此表的最新统计信息。

-------------------------------------------------------------------------------
EXPLAIN PLANS SECTION
-------------------------------------------------------------------------------

1- Original
-----------
Plan hash value: 2976124318

-------------------------------------------------------------------------------------------------------------------
| Id  | Operation                          | Name                         | Rows  | Bytes | Cost (%CPU)| Time     |
-------------------------------------------------------------------------------------------------------------------
|   0 | INSERT STATEMENT                   |                              |  8168 | 32672 |    19   (0)| 00:00:01 |
|   1 |  LOAD TABLE CONVENTIONAL           | WRI$_ADV_OBJSPACE_TREND_DATA |       |       |            |          |
|   2 |   COLLECTION ITERATOR PICKLER FETCH| OBJECT_GROWTH_TREND          |  8168 | 32672 |    19   (0)| 00:00:01 |
-------------------------------------------------------------------------------------------------------------------

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


sys@ORCL>