How to get min,max,avg time for query execution?

Question

Dear Friends,
In AWR we are getting avg time taken to execute particular query, how can one get min,max time taken by query during number of executions.
Thanks

Answer 1

I would run the sql in a cursor for loop, to get a quite reasonable execution time without changing the actual execution plan:
SQL> show user;
USER is "HR"
SQL> set timing on
SQL> select count(*) from all_objects;
  COUNT(*)
     55565
Elapsed: 00:00:03.91
SQL> var p_sql varchar2(200)
SQL> exec :p_sql := 'select * from all_objects'
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.00
SQL> declare
  2  t1 timestamp := systimestamp;
  3  begin
  4    execute immediate 'begin for c in (' || :p_sql || ') loop null; end loop; end;';
  5    dbms_output.put_line('Elapsed: ' || (systimestamp - t1));
  6  end;
  7  /
PL/SQL procedure successfully completed.
Elapsed: 00:00:03.53
SQL> declare
  2  t1 timestamp := systimestamp;
  3  begin
  4    execute immediate 'begin for c in (' || :p_sql || ') loop null; end loop; end;';
  5    dbms_output.put_line('Elapsed: ' || (systimestamp - t1));
  6  end;
  7  /
PL/SQL procedure successfully completed.
Elapsed: 00:00:02.75
SQL> declare
  2  t1 timestamp := systimestamp;
  3  begin
  4    execute immediate 'begin for c in (' || :p_sql || ') loop null; end loop; end;';
  5    dbms_output.put_line('Elapsed: ' || (systimestamp - t1));
  6  end;
  7  /
PL/SQL procedure successfully completed.
Elapsed: 00:00:02.73
SQL> declare
  2  t1 timestamp := systimestamp;
  3  begin
  4    execute immediate 'begin for c in (' || :p_sql || ') loop null; end loop; end;';
  5    dbms_output.put_line('Elapsed: ' || (systimestamp - t1));
  6  end;
  7  /
PL/SQL procedure successfully completed.
Elapsed: 00:00:02.66
SQL> ---- alter system flush shared_pool;
SQL> declare
  2  t1 timestamp := systimestamp;
  3  begin
  4    execute immediate 'begin for c in (' || :p_sql || ') loop null; end loop; end;';
  5    dbms_output.put_line('Elapsed: ' || (systimestamp - t1));
  6  end;
  7  /
PL/SQL procedure successfully completed.
Elapsed: 00:00:02.80
SQL> declare
  2  t1 timestamp := systimestamp;
  3  begin
  4    execute immediate 'begin for c in (' || :p_sql || ') loop null; end loop; end;';
  5    dbms_output.put_line('Elapsed: ' || (systimestamp - t1));
  6  end;
  7  /
PL/SQL procedure successfully completed.
Elapsed: 00:00:02.64
SQL>
https://forums.oracle.com/thread/705536?start=15&tstart=0
Regards
Girish Sharma