create table testobj as select * from dba_objects;
exec dbms_stats.gather_table_stats(ownname => 'TEST',tabname => 'TESTOBJ',cascade => true);
必须存在统计信息，否则saa是不起作用的，刚开始实验迷糊了，就是没结果，查了好些例子才发现
exec dbms_advisor.quick_tune(DBMS_ADVISOR.SQLACCESS_ADVISOR,'mytask1','select * from testobj where OBJECT_ID=16');
SQL> select * from dba_advisor_actions where task_name ='mytask1' ;
OWNER TASK_ID TASK_NAME EXECUTION_NAME REC_ID ACTION_ID OBJECT_ID COMMAND COMMAND_ID FLAGS ATTR1 ATTR2 ATTR3 ATTR4 ATTR5 ATTR6 NUM_ATTR1 NUM_ATTR2 NUM_ATTR3 NUM_ATTR4 NUM_ATTR5 MESSAGE FILTERED
-------------------------------------------------------------------------------- ---------- -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- ---------- ---------- ---------- ---------------------------------------------------------------- ---------- ---------- -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- ---------- ---------- ---------- ---------- ---------- -------------------------------------------------------------------------------- --------
TEST 41 mytask1 1 1 0 CREATE INDEX 2 0 "TEST"."TESTOBJ_IDX$$_00290000" "TEST"."TESTOBJ" BTREE ("OBJECT_ID") 1332956 0 0 0 0 N
SQL> select * from user_advisor_sqla_wk_stmts where task_name ='mytask1' ;
TASK_NAME TASK_ID SQLSET_ID SQLSET_NAME WORKLOAD_NAME SQL_ID SQL_SEQ PLAN_HASH_VALUE PARSING_SCHEMA_NAME USERNAME MODULE ACTION CPU_TIME BUFFER_GETS DISK_READS ELAPSED_TIME ROWS_PROCESSED EXECUTIONS FIRST_LOAD_TIME LAST_EXECUTION_DATE PRIORITY COMMAND_TYPE STAT_PERIOD ACTIVE_STAT_PERIOD SQL_TEXT PRECOST POSTCOST IMPORTANCE REC_ID VALIDATED
-------------------------------------------------------------------------------- ---------- ---------- -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- ------------- ---------- --------------- -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- ---------------------------------------------------------------- ---------------------------------------------------------------- ---------- ----------- ---------- ------------ -------------- ---------- --------------- ------------------- ---------- ------------ ----------- ------------------ -------------------------------------------------------------------------------- ---------- ---------- ---------- ---------- ----------
mytask1 set LONGCHUNKSIZE 999999
set serveroutput on size 999999
set long 999999
SQL> select dbms_advisor.get_task_script('mytask1') from dual;
DBMS_ADVISOR.GET_TASK_SCRIPT('
--------------------------------------------------------------------------------
Rem SQL 访问指导: 版本 18.0.0.0.0 - 正式版
Rem
Rem 用户名: TEST
Rem 任务: mytask1
Rem 执行日期:
Rem
CREATE INDEX "TEST"."TESTOBJ_IDX$$_002B0000"
ON "TEST"."TESTOBJ"
("OBJECT_ID")
COMPUTE STATISTICS;查看优化效果
select a.owner,
a.task_id,
a.task_name,
execution_start,
a.status_message,
b.command from dba_advisor_log a,
dba_advisor_actions b where a.task_id = b.task_id and b.task_name = 'mytask1'
OWNER TASK_ID TASK_NAME EXECUTION_START STATUS_MESSAGE COMMAND
1 TEST 41 mytask1 2018/12/13 14:54:57 访问指导执行完毕 CREATE INDEX
SELECT sql_id,
precost 优化前cost,
postcost 优化后cost,
(precost / postcost) cost提升倍数，decode(PRIORITY, 1, '高', 2, '中', 3, '低') 重要性
FROM dba_advisor_sqla_wk_stmts
WHERE
task_name='mytask1';
SQL_ID 优化前COST 优化后COST COST提升倍数 重要性
1 3gc62uk6vc0pu 389 3 129.666666666666666666666666666666666667 中
感觉报告比sta牛逼很多
exec dbms_advisor.delete_task('mytask1');