RE: db file scattered read

From: Wolfson Larry - lwolfs <lawrence.wolfson_at_acxiom.com>
Date: Fri, 6 Aug 2004 21:14:09 -0500
Message-ID: <433A07749711884D8032B6A0AB115262C2BD06@conmsx07.corp.acxiom.net>

Table monitoring causes SMON to populate DBA_TAB_MODIFICATIONS every 15 minutes in 9
8i it's every 3 hours. You get information on inserts,updates,deletes,truncates

OR in 9

EXECUTE DBMS_STATS.FLUSH_DATABASE_MONITORING_INFO; like

POP1 07-AUG-2004 02:32:45

 OWNER   TABLE_NAME                      INSERTS      UPDATES   DELETES TRU

TIME

-------- ----------------------------- --------- ------------ --------- ---
--------------------
XXXUSER  ACXSTATS                         22,325            0         0 NO
06-AUG-2004 20:03:44
XXXUSER  ADDRESS                          86,152       11,699       280 NO
07-AUG-2004 02:32:45
XXXUSER  APPOINTMENT                       5,254          475         0 NO

07-AUG-2004 01:58:03 or

SELECT 'TABLES THAT HAVE DELETES > 1000:' FROM DUAL; Or Just for Truncates

1 SELECT TABLE_OWNER

  2        ,TABLE_NAME
  3        ,INSERTS
  4        ,UPDATES
  5        ,DELETES
  6        ,TRUNCATED
  7        ,TO_CHAR(TIMESTAMP,'DD-MON-YYYY HH24:MI:SS') TIME

8 FROM DBA_TAB_MODIFICATIONS
9 WHERE TRUNCATED = 'YES'
10 --AND TABLE_OWNER LIKE UPPER('%&Schema_owner')

Larry

-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Justin Cave Sent: Friday, August 06, 2004 9:22 PM
To: oracle-l_at_freelists.org
Subject: RE: db file scattered read

I believe that MONITORING instructs Oracle to keep a rough count of the number of rows in a table that have changed since the last time statistics were gathered, so that when you gather statistics next, if you specify GATHER STALE, Oracle will know which tables it actually needs to gather statistics on. I don't believe that MONITORING instructs Oracle to update the statistics automatically.

Justin Cave
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

-----Original Message-----
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Mladen Gogala
Sent: Friday, August 06, 2004 8:01 PM
To: oracle-l_at_freelists.org
Subject: Re: db file scattered read

On 08/06/2004 08:19:49 PM, Lyndon Tiu wrote:
>
> I have to analyze manually all the time?

In 9i you sen set table to "MONITORING", and Oracle will collect statistics automatically. In 9i you can set dynamic sampling to 4 and Oracle will collect statistics during parse.

--
Mladen Gogala
Oracle DBA
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Received on Fri Aug 06 2004 - 21:35:51 CDT