RE: LMT Autoallocation question

From: SARKAR, Samir <Samir.SARKAR_at_nottingham.sema.slb.com>
Date: Fri, 16 Nov 2001 02:47:15 -0800
Message-ID: <F001.003C71B4.20011116021518@fatcity.com>

Raj,

The AUTOALLOCATE option causes the tablespace to b created with a bitmap containing one bit for each data block. Oracle controls the extent size. When we create an object in the tablespace, Oracle will start out by allocating 64KB extent to that object. As the object grows, more 64KB extents
will be added.
Use the UNIFORM SIZE clause to manage storage space in extents that r larger than
one block.
CREATE TABLESPACE <tablespace_name>
   DATAFILE '/PATH OF DATAFILE'
   SIZE 1000M
   EXTENT MANAGEMENT LOCAL UNIFORM SIZE SIZE 50M. The Uniform extent size will b rounded up to the nearest integer multiple of the
database block size. Here, the bitmap will contain one bit for each 50MB of storage
space in the tablespace.

Oracle will allocate the initial extent of 64KB even if we ask for less.

Also remember, begining with the 16th extent, Oracle will increase the default
extent size from 64KB to 1MB.

Hope this helps.

Samir Sarkar
Oracle DBA - Lennon Team
SchlumbergerSema
Email : samir.sarkar_at_nottingham.sema.slb.com

samir.sarkar_at_sema.co.uk
Phone : +44 (0) 115 - 95 76217
EPABX : +44 (0) 115 - 957 6418 Ext. 76217 Fax : +44 (0) 115 - 957 6018

-----Original Message-----
Sent: 15 November 2001 21:01
To: Multiple recipients of list ORACLE-L

Hi all,

I tried to read through, but couldn't find the exact answer I am looking for. If AUTOALLOCATE is specified for LMT, how does oracle determine the next extent size?

TIA
Raj

Rajendra Jamadagni MIS, ESPN Inc. Rajendra dot Jamadagni at ESPN dot com
Any opinion expressed here is personal and doesn't reflect that of ESPN Inc.

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Author: SARKAR, Samir
INET: Samir.SARKAR_at_nottingham.sema.slb.com

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