TOP 10 SQL QUERIES

Question

Hi,
How can i find the top 10 sql queries which consuming high IO, CPU's. in oracle db.
I am doing in one way that by using TOP command trying to get PID's then i am getting the sql query by applying the hash value in v$sqlarea.
Is there any way to get directly high consumed IO and CPU's with out seeing PID's in TOP command.
Thansk

Answer 1

hi,
try something along the lines of
select c.* from
    (select disk_reads,
            buffer_gets,
            rows_processed,
            executions,
            first_load_time,
            sql_text
       from v$sqlarea
       where parsing_user_id !=0
       order by
          buffer_gets/decode(executions,null,1,0,1,executions) desc ) c
where rownum < 11;
select c.* from
    (select disk_reads,
            buffer_gets,
            rows_processed,
            executions,
            first_load_time,
            sql_text
       from v$sqlarea
       order by
          disk_reads/decode(rows_processed,null,1,0,1,rows_processed) desc ) c
where rownum <11;or even
--Top 10 by Buffer Gets:
set linesize 100
set pagesize 100
SELECT * FROM
(SELECT substr(sql_text,1,40) sql,
        buffer_gets, executions, buffer_gets/executions "Gets/Exec",
        hash_value,address
   FROM V$SQLAREA
  WHERE buffer_gets > 10000
ORDER BY buffer_gets DESC)
WHERE rownum <= 10
--Top 10 by Physical Reads:
set linesize 100
set pagesize 100
SELECT * FROM
(SELECT substr(sql_text,1,40) sql,
        disk_reads, executions, disk_reads/executions "Reads/Exec",
        hash_value,address
   FROM V$SQLAREA
  WHERE disk_reads > 1000
ORDER BY disk_reads DESC)
WHERE rownum <= 10
--Top 10 by Executions:
set linesize 100
set pagesize 100
SELECT * FROM
(SELECT substr(sql_text,1,40) sql,
        executions, rows_processed, rows_processed/executions "Rows/Exec",
        hash_value,address
   FROM V$SQLAREA
  WHERE executions > 100
ORDER BY executions DESC)
WHERE rownum <= 10
--Top 10 by Parse Calls:
set linesize 100
set pagesize 100
SELECT * FROM
(SELECT substr(sql_text,1,40) sql,
        parse_calls, executions, hash_value,address
   FROM V$SQLAREA
  WHERE parse_calls > 1000
ORDER BY parse_calls DESC)
WHERE rownum <= 10
--Top 10 by Sharable Memory:
set linesize 100
set pagesize 100
SELECT * FROM
(SELECT substr(sql_text,1,40) sql,
        sharable_mem, executions, hash_value,address
   FROM V$SQLAREA
  WHERE sharable_mem > 1048576
ORDER BY sharable_mem DESC)
WHERE rownum <= 10
--Top 10 by Version Count:
set linesize 100
set pagesize 100
SELECT * FROM
(SELECT substr(sql_text,1,40) sql,
        version_count, executions, hash_value,address
   FROM V$SQLAREA
  WHERE version_count > 20
ORDER BY version_count DESC)
WHERE rownum <= 10
;you may have to play around with the column formatting a little to show the best results
regards
Alan
Edited by: alanm on Dec 22, 2008 4:01 PM