RE: Question about many Oracle Data Files

I agree 100% in what your saying, but I think saying "It is really bad to drop tables randomly from production environment" would be a very similar assesmment. If your doing a checkpoint every 15 seconds with 1,000,000 datafiles over 3,500 tablespaces with 10k redo logs, well perhaps the problem isn't the database.

"Walking on water and developing software from a specification are easy if both are frozen."

Christopher R. Spence
Oracle DBA
Fuelspot

-----Original Message-----
Sent: Tuesday, June 12, 2001 9:15 PM
To: Multiple recipients of list ORACLE-L

>I beg to differ with this persons assessment.
>
>Number of datafiles hardly effect performance in any noticable
>manor. This
>can be noted during checkpoint where high count of data files
>check point
>with similar efficiency of low number.

Christopher,

It is not *only* the number of datafiles that affects performance - it is the combination of number of log switches X number of files that is the problem. A reduction in either of these two equals to a low percentage of I/O for file header update vs actual, 'useful' I/O. A small set of redolog files with a large number of files = disaster (which implements itself as sudden occurences of 'database freeze')

John Kanagaraj

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: John Kanagaraj
  INET: john.kanagaraj_at_hds.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).
-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Christopher Spence
  INET: cspence_at_FuelSpot.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).