DELETE FROM stats$sql_summary
WHERE(snap_id,   dbid,   instance_number,   hash_value,   text_subset) IN
  (SELECT ss.snap_id,
     ss.dbid,
     ss.instance_number,
     ss.hash_value,
     ss.text_subset
   FROM stats$sql_summary ss,
     stats$statspack_parameter sp
   WHERE ss.dbid = sp.dbid
   AND ss.instance_number = sp.instance_number
   AND ss.executions < sp.executions_th *1
   AND ss.parse_calls < sp.parse_calls_th *1
   AND ss.disk_reads < sp.disk_reads_th *1
   AND ss.buffer_gets < sp.buffer_gets_th *1
   AND ss.sharable_mem < sp.sharable_mem_th *1
   AND ss.version_count < sp.version_count_th *1)
;

commit;

DELETE  /*+ index(spu )*/
FROM stats$sql_plan_usage spu
WHERE NOT EXISTS
  (SELECT 1
   FROM stats$sql_summary ss
   WHERE ss.dbid = spu.dbid
   AND ss.instance_number = spu.instance_number
   AND ss.snap_id = spu.snap_id
   AND ss.hash_value = spu.hash_value
   AND ss.text_subset = spu.text_subset)
;

commit;


DELETE FROM stats$sql_plan sp
WHERE NOT EXISTS
  (SELECT 1
   FROM stats$sql_plan_usage spu
   WHERE spu.plan_hash_value = sp.plan_hash_value)
;

COMMIT;

