Top Expensive SQLs

Question

I have following query to identify top expensive sql statements.
SELECT Substr(a.sql_text,1,50) sql_text,
Trunc(a.disk_reads/Decode(a.executions,0,1,a.executions)) reads_per_execution,
a.buffer_gets,
a.disk_reads,
a.executions,
a.sorts,
a.address
FROM v$sqlarea a
ORDER BY 2 DESC
However, I have a need to fetch corresponding session information that are running these queries. Is there a way I can connect v$sqlarea with v$session?
Thanks,
R

Answer 1

You should use hash_value and sql_address as there can be more sqls with same hash value but different address.
This might give you some idea for improvement:
-- sessions and other useful stuff                                                             
SELECT   s.SID SID, s.serial# serial, s.status status,
         (i.block_gets + i.consistent_gets) logical_reads,
         i.consistent_gets consistent_gets, i.block_gets block_gets,
         i.physical_reads physical_reads,
         (i.block_changes + i.consistent_changes) block_changes,
         NVL (DECODE (TYPE,
                      'BACKGROUND', 'SYS (' || b.NAME || ')',
                      s.username
              SUBSTR (p.program, INSTR (p.program, '('))
             ) oracle_user,
         s.process client_pid, s.machine machine, p.spid server_pid,
         NVL (s.osuser, '(' || b.NAME || ')') os_user,
         s.program client_program, s.logon_time logon_time,
         s.username user_name, s.module module,
         q.sql_text,
         s.sql_address sql_address, s.sql_hash_value sql_hash_value
    FROM v$session s,
         v$process p,
         v$sess_io i,
         v$bgprocess b,
         v$sqlarea q
   WHERE p.addr = s.paddr
     AND i.SID = s.SID
     AND p.addr = b.paddr(+)
     AND q.address(+) = s.sql_address
     AND q.hash_value(+) = s.sql_hash_value
     AND TYPE != 'BACKGROUND'
ORDER BY user_nameThis will work also on older versions of the database <= 9i.
HTH, Joze
Co-author of the forthcoming book "Expert Oracle Practices"
http://www.apress.com/book/view/9781430226680
Oracle related blog: http://joze-senegacnik.blogspot.com/
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Edited by: Joze Senegacnik on 10.12.2009 0:27