How to check query plan change in oracle

If you would like to and out change in SQL plan of a query, below script will help you nd the SQL plan ID for previous executions and check if there is any change in SQL plan ID.

sql">set pagesize 1000
set linesize 200
column begin_interval_time format a20
column milliseconds_per_execution format 999999990.999
column rows_per_execution format 999999990.9
column buffer_gets_per_execution format 999999990.9
column disk_reads_per_execution format 999999990.9
break on begin_interval_time skip 1
SELECT
to_char(s.begin_interval_time,'mm/dd hh24:mi')
AS begin_interval_time,
ss.plan_hash_value,
ss.executions_delta,
CASE
WHEN ss.executions_delta > 0
THEN ss.elapsed_time_delta/ss.executions_delta/1000
ELSE ss.elapsed_time_delta
END AS milliseconds_per_execution,
CASE
WHEN ss.executions_delta > 0
THEN ss.rows_processed_delta/ss.executions_delta
ELSE ss.rows_processed_delta
END AS rows_per_execution,
CASE
WHEN ss.executions_delta > 0
THEN ss.buffer_gets_delta/ss.executions_delta
ELSE ss.buffer_gets_delta
END AS buffer_gets_per_execution,
CASE
WHEN ss.executions_delta > 0
THEN ss.disk_reads_delta/ss.executions_delta
ELSE ss.disk_reads_delta
END AS disk_reads_per_execution
FROM wrh$_sqlstat ss
INNER JOIN wrm$_snapshot s ON s.snap_id = ss.snap_id
WHERE ss.sql_id = '&sql_id'
AND ss.buffer_gets_delta > 0
ORDER BY s.snap_id, ss.plan_hash_value;
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