RE: Dba_tab_modifications question

Prakash,

My understanding is that the updation of counts for MONITORed tables is done without using latching, so that normal DML is not held up by some additional latches. This will explain the small difference that you are seeing, i.e. the counting of some INSERTs were missed due to race conditions that could have otherwise been prevented by latches.

Am I as clear as mud or what!

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

The manuals for Oracle are here: http://tahiti.oracle.com The manual for Life is here: http://www.gospelcom.net

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

> -----Original Message-----
> From: Grabowy, Chris [mailto:cgrabowy_at_fcg.com]
> Sent: Wednesday, May 15, 2002 12:33 PM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: Dba_tab_modifications question
>
>
> Hey Prakash,
>
> I never knew about that dictionary table, so I looked it up
> and found...
>
> These views describe tables that have been modified since the
> last time
> table statistics were gathered on them. The views are
> populated only for
> tables with the MONITORING attribute. They are not populated
> immediately,
> but after a time lapse (usually 3 hours).
>
> Perhaps that explains the diff. Check it out.
>
> Chris
>
> -----Original Message-----
> Sent: Wednesday, May 15, 2002 1:03 PM
> To: Multiple recipients of list ORACLE-L
>
>
> Hello,
>
> Oracle 8.1.6 on HP-UX 11.0
>
> WFM_ADMIN_at_VGRAFO> select num_rows,last_analyzed,monitoring
> from user_tables
> where table_name = 'NOTES_LOG';
>
> NUM_ROWS LAST_ANAL MON
> ------------------- ---------------- -------
> 1585697 14-MAY-02 YES
>
> Last night, Informatica inserted rows into this table.
>
> 1 select inserts,updates,deletes from dba_tab_modifications
> 2* where table_name = 'NOTES_LOG'
> WFM_ADMIN_at_VGRAFO> /
>
> INSERTS UPDATES DELETES
> -------------- -------------- ---------------
> 6509 0 0
>
> WFM_ADMIN_at_VGRAFO> select count(*) from notes_log;
>
> COUNT(*)
> ----------
> 1592488
>
> The difference between yesterday's and today's count is 6791
> which does not
> match the number in dba_tab_modifications.
>
> Does this mean that I cannot rely on dba_tab_modifications?
>
>
> TIA
> Prakash
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: BALA,PRAKASH (Non-HP-USA,ex1)
> INET: prakash_bala_at_non.hp.com
>
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: John Kanagaraj
  INET: john.kanagaraj_at_hds.com

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