This thread has been very interesting and causing me to learn and go read some more. Which leads me to my next question. Does anyone have any good papers or urls that will discuss and explain all of the base data dictionary tables: fet$, uet$, etc.? Or anyone have a data model of how all of the tables relate. I've only been in this long enough to feel comfortable with the data dictionary tables and v$views and have never delved into learning about the base tables, maybe it's time I do some serious studying. If anyone can point me into the right direction as far as learning this topic, I'd really appreciate it. Thanks. Ivan
-----Original Message-----
From: Mohammad Rafiq [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, October 02, 2001 6:14 PM
To: Multiple recipients of list ORACLE-L
Subject: RE: Extents size.
As far as DDL is concerned ,Yes. I have seen Dataware House application(not
a good design) that dropping/truncating tables with lot of extents takes
longer time because of extent management. Such code must take into account
no of extents of such objects. If those objects are created with proper
sizing then it will perform better for any DDL.
Regards
MOHAMMAD RAFIQ
Reply-To: [EMAIL PROTECTED]
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
Date: Tue, 02 Oct 2001 13:15:30 -0800
Why is that? And would that only count for an object in a dictionary
managed tablespace? Would the time/speed it takes for drops and truncates
really matter as far as performance is concerned? What I mean is who would
set storage specs for objects with the speed it takes for truncates and
drops of that object in mind? It would seem to me that if an object is
getting dropped or truncated that often that speed should be an issue, there
are bigger problems at hand. Guru's correct me if I'm wrong please. Later,
Ivan
-----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: [EMAIL PROTECTED]
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
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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