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To find explain plan for a statement that occurred in past.

Posted on 27-Sep-2006 By Admin No Comments on To find explain plan for a statement that occurred in past.

Find hash value & time when this plan was taken for particular sql id.

Filename : fphv.sql

REM *** Find Plan Hash value

column plan_hash_value format 999999999999

accept v_sqlid prompt ‘Enter SQL_ID : ‘

select distinct sql_id, plan_hash_value, to_char(timestamp, ‘DD-MON-RRRR:HH24:MI:SS’) from dba_hist_sql_plan

where sql_id=’&v_sqlid’;

Then, Apply sql id and plan_hash_value for a unique plan.

REM fplan.sql

REM Find execution plan from dba_hist_sql_plan for a specific SQL_ID and PLAN_HASH_VALUE.

column plan_hash_value format 999999999999

accept v_sqlid prompt ‘Enter SQL_ID : ‘

accept v_plan_hash_value prompt ‘Enter PLAN Hash Value : ‘

SELECT LPAD(‘ ‘,2*(LEVEL-1))||operation||’ ‘||options ||’ ‘||object_name ||’ ‘|| DECODE(id, 0, ‘Cost = ‘||position)

“Query Plan”

FROM dba_hist_sql_plan

START WITH id = 0 and sql_id=’&v_sqlid’ and plan_hash_value=&v_plan_hash_value

CONNECT BY PRIOR id = parent_id and sql_id=’&v_sqlid’ and plan_hash_value=&v_plan_hash_value;

SQl_ID and SQL statement you can get from currwaitobj.sql

set lines 120 pages 200

column event format a30

column object_type format a14

column object_name format a30

column owner format a10

column sql_text format a120

spool currwaitobj

accept event_name prompt ‘Enter fraction of event to trace : ‘

accept start_time1 prompt ‘Start Time in (DD-MON-RRRR:HH24:MI format) : ‘

accept stop_time1 prompt ‘Stop Time in (DD-MON-RRRR:HH24:MI format) : ‘

select distinct a.event

from v$active_session_history a

where sample_time between to_date(‘&start_time1’, ‘DD-MON-RRRR:HH24:MI’) and to_date(‘&stop_time1’, ‘DD-MON-RRRR:HH24:MI’);

select distinct a.event, s.sql_id, s.sql_text

from v$active_session_history a, v$sqlarea s

where s.sql_id = a.sql_id

and lower(a.event) like lower(‘%&event_name%’)

and sample_time between to_date(‘&start_time1’, ‘DD-MON-RRRR:HH24:MI’) and to_date(‘&stop_time1’, ‘DD-MON-RRRR:HH24:MI’)

order by s.sql_id;

spool off

Oracle, SQL scripts

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