Steps to run SQL Tuning Advisor For a sql_id
To get the tuning recommendations we run SQL tuing advisor for a sql statement or a query.
It might give suggestion to create few indexes or accepting a SQL profile also.
Diagnostic and Tuning license would be required for the same.
Here are the steps how to run sql tuning advisor against sql_Id.
Suppose the sql id is – 97s9z1zzpsp99
Step 1. Create Tuning Task
DECLARE
l_sql_tune_task_id VARCHAR2(100);
BEGIN
l_sql_tune_task_id := DBMS_SQLTUNE.create_tuning_task (sql_id => '97s9z1zzpsp99',
scope => DBMS_SQLTUNE.scope_comprehensive,
time_limit => 500,
task_name => '97s9z1zzpsp99_tuning_sid1',
description => 'Tuning task1 for statement 97s9z1zzpsp99');
DBMS_OUTPUT.put_line('l_sql_tune_task_id: ' || l_sql_tune_task_id);
END;
/
Step 2. Execute Tuning task:
EXEC DBMS_SQLTUNE.execute_tuning_task(task_name => '97s9z1zzpsp99_tuning_sid1');
Step 3. Get the Tuning advisor report.
set long 6553600
set longchunksize 10000
set linesize 1000
select dbms_sqltune.report_tuning_task('97s9z1zzpsp99_tuning_sid1') from dual;
Step 4: List of tuning task present in database:
SELECT TASK_NAME, STATUS FROM DBA_ADVISOR_LOG WHERE TASK_NAME ;
Step 5: Drop a tuning task:
execute dbms_sqltune.drop_tuning_task('97s9z1zzpsp99_tuning_sid1');
IF SQL_ID is not present in cursor use AWR
Step 1: Need to find begin and end snap:
select a.instance_number inst_id, a.snap_id,a.plan_hash_value, to_char(begin_interval_time,'dd-mon-yy hh24:mi') btime,
abs(extract(minute from (end_interval_time-begin_interval_time)) + extract(hour from (end_interval_time-begin_interval_time))*60
+ extract(day from (end_interval_time-begin_interval_time))*24*60) minutes,
executions_delta executions, round(ELAPSED_TIME_delta/1000000/greatest(executions_delta,1),4) "avg duration (sec)"
from dba_hist_SQLSTAT a, dba_hist_snapshot b
where sql_id='&sql_id' and a.snap_id=b.snap_id
and a.instance_number=b.instance_number
order by snap_id desc, a.instance_number;
begin_snap -> 180
end_snap -> 200
Step 2. Create Tuning Task
DECLARE
l_sql_tune_task_id VARCHAR2(100);
BEGIN
l_sql_tune_task_id := DBMS_SQLTUNE.create_tuning_task (begin_snap => 180,
end_snap => 200,
sql_id => '97s9z1zzpsp99',
scope => DBMS_SQLTUNE.scope_comprehensive,
time_limit => 500,
task_name => '97s9z1zzpsp99_tuning_sid1',
description => 'Tuning task1 for statement 97s9z1zzpsp99');
DBMS_OUTPUT.put_line('l_sql_tune_task_id: ' || l_sql_tune_task_id);
END;
/
Step 3. Execute Tuning task:
EXEC DBMS_SQLTUNE.execute_tuning_task(task_name => '97s9z1zzpsp99_tuning_sid1');
Step 4. Get the Tuning advisor report.
set long 6553600
set longchunksize 10000
set linesize 1000
select dbms_sqltune.report_tuning_task('97s9z1zzpsp99_tuning_sid1') from dual;
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