RE: db file scattered read
- From: Wolfson Larry - lwolfs <lawrence.wolfson@xxxxxxxxxx>
- To: "'oracle-l@xxxxxxxxxxxxx'" <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 6 Aug 2004 21:14:09 -0500
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@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of Justin Cave
Sent: Friday, August 06, 2004 9:22 PM
To: oracle-l@xxxxxxxxxxxxx
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@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
On Behalf Of Mladen Gogala
Sent: Friday, August 06, 2004 8:01 PM
To: oracle-l@xxxxxxxxxxxxx
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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