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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Extents size.
I have put together a summary of this thread as a tip on my website:
http://www.vampired.net/forums/viewtopic.php?topic=47&forum=15&0
For those who are interested in this.
"Do not criticize someone until you walked a mile in their shoes, that way when you criticize them, you are a mile a way and have their shoes."
Christopher R. Spence
Oracle DBA
Phone: (978) 322-5744
Fax: (707) 885-2275
Fuelspot
73 Princeton Street
North, Chelmsford 01863
-----Original Message-----
Sent: Tuesday, October 02, 2001 5:50 PM
To: Multiple recipients of list ORACLE-L
Thanks.You are right....
MOHAMMAD RAFIQ
Reply-To: ORACLE-L_at_fatcity.com
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
Date: Tue, 02 Oct 2001 13:10:30 -0800
Yes, that is very true. That is why I mentioned the performance will be noticeable at times when dealing with the extent bitmaps for LMT and the dictionary for dictionary managed, wither it be ad-hoc or recursive sql.
Unless your doing a lot of truncates or drops, I would bear performance changes on DML and not DDL.
"Do not criticize someone until you walked a mile in their shoes, that way when you criticize them, you are a mile a way and have their shoes."
Christopher R. Spence
Oracle DBA
Phone: (978) 322-5744
Fax: (707) 885-2275
Fuelspot
73 Princeton Street
North, Chelmsford 01863
-----Original Message-----
Sent: Tuesday, October 02, 2001 3:56 PM
To: Multiple recipients of list ORACLE-L
Any DDL like drop table and truncate table definately take longer with 10,000 extents than 1 extent. Try it. There was a test result 1 year back by
a list member on that.
Regards
MOHAMMAD RAFIQ
Reply-To: ORACLE-L_at_fatcity.com
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
Date: Tue, 02 Oct 2001 07:55:28 -0800
That is completely a myth. There is no notable performance different with a table with 10,000 extents and one with 1.
The only problem is when it comes to the bitmaps when dealing with LMT and cluster when dealing with dictionary managed. When you query the extent views, or do space management type processes.
"Do not criticize someone until you walked a mile in their shoes, that way when you criticize them, you are a mile a way and have their shoes."
Christopher R. Spence
Oracle DBA
Phone: (978) 322-5744
Fax: (707) 885-2275
Fuelspot
73 Princeton Street
North, Chelmsford 01863
-----Original Message-----
Sent: Monday, October 01, 2001 7:15 PM
To: Multiple recipients of list ORACLE-L
May be it is good practice to keep number of extents to be less than 50, no matter what the size of extent.
-----Original Message-----
Sent: Monday, October 01, 2001 3:35 PM
To: Multiple recipients of list ORACLE-L
Hello,
I'll do an reorganization of a database (about 140 gigs). Some people say that it'd be good to use 128K, 4M and 128M extents. I saw somewhere it'd be 160K, 4M and 160M. Which size do you advice me ? I have also many small indexes (less than 16K).
Regards,
Thanh-truc Nguyen
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