Oracle-L: RE: Hot tables

From: John Kanagaraj <john.kanagaraj_at_hds.com>
Date: Thu, 25 Jul 2002 10:38:40 -0800
Message-ID: <F001.004A2A65.20020725103840@fatcity.com>

Tom,

If you are on 8i, how about using an ALTER TABLE <tab> MONITORING on all user tables - schema by schema if you prefer - and looking at DBA_TAB_MODIFICATIONS after a predefined period. My understanding from the Guru (Steve Adams that is!) is that this tracking is achieved in memory via unlatched activity so there is (should) be no performance overhead for turning on this monitoring - this structure is flushed to disk once in 3 hours apparently. 9i takes this further by allowing Indexes to be montored too (haven't tried that yet!)

Oh-Boy! It is nice to have On-topic queries after all those looooong OT threads.

Hth,
John Kanagaraj
Oracle Applications DBA
DBSoft Inc
(W): 408-970-7002

Want to know about a carpenter who built a bridge with two sticks and three nails? Write me for details!

The opinions and statements above are entirely my own and not those of my employer or clients **

-----Original Message-----
Sent: Thursday, July 25, 2002 5:48 AM
To: Multiple recipients of list ORACLE-L

How is everyone identifying hot tables? In my tool box I have the following two scripts but I am looking for other options. How do you track frequently accessed tables?

Script #1 - Author unknown:
select obj_name, sum(decode(action_name,'SELECT',1,0)) sel ,sum(decode(action_name,'INSERT',1,0)) inserts,

                            sum(decode(action_name,'UPDATE',1,0)) updates, 
                            sum(decode(action_name,'DELETE',1,0)) deletes

from dba_audit_trail
having sum(decode(action_name,'SELECT' , 1, 'INSERT',1, 'DELETE',1,'UPDATE',1,0)) > 0
group by obj_name;

Script #2 - Dave Ensor (BMC):
set verify off
col CTYP heading 'Command Type'

col OBJ  format a32 wrap   heading 'Table' 
col EXES format 999,990    heading 'Execs' 
col GETS format 99,999,990 heading 'Buff Gets' 
col ROWP format 99,999,990 heading 'Rows Proc' 

select CTYP 


     , OBJ 

     , 0 - EXEM  EXES 

     , GETS 

     , ROWP 

  from (select distinct EXEM, CTYP, OBJ, GETS, ROWP 
          from ( select decode (S.COMMAND_TYPE 
                                  ,  2, 'Insert into ' 
                                  ,  3, 'Select from ' 
                                  ,  6, 'Update  of  ' 
                                  ,  7, 'Delete from ' 
                                  , 26, 'Lock    of  ') CTYP 
                         , O.OWNER || '.' || O.NAME    OBJ 
                         , sum(0 - S.EXECUTIONS)       EXEM 
                         , sum(S.BUFFER_GETS)          GETS 
                         , sum(S.ROWS_PROCESSED)       ROWP 
                    from V$SQL               S 
                       , V$OBJECT_DEPENDENCY D 
                       , V$DB_OBJECT_CACHE   O 
                   where S.COMMAND_TYPE in (2,3,6,7,26) 
                     and D.FROM_ADDRESS = S.ADDRESS 
                     and D.TO_OWNER     = O.OWNER 
                     and D.TO_NAME      = O.NAME 
                     and O.TYPE         = 'TABLE' 
                group by S.COMMAND_TYPE 
                       , O.OWNER 
                       , O.NAME )  )

where ROWNUM <= &1
/

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-- 
Author: John Kanagaraj
  INET: john.kanagaraj_at_hds.com

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Received on Thu Jul 25 2002 - 13:38:40 CDT