There's a funny thing about the:
| Tail portion of Bitmap Blocks M blocks
It doesn't really exist despite Oracle documents
to the contrary. Try creating a file with some
waste space at the end of it so that the
'Tail' points to the start of the waste space; then
increase the file size by one extent.
The 'Tail' will apparently move.
A potentially important detail for using LMTs
(with uniform space management) - the file size
should be a multiple of the extent size plus
64K (or in special cases, perhaps 128K is
needed) to avoid wasting the best part of one
extent at the end of the file.
Jonathan Lewis
http://www.jlcomp.demon.co.uk
Host to The Co-Operative Oracle Users' FAQ
http://www.jlcomp.demon.co.uk/faq/ind_faq.html
Author of:
Practical Oracle 8i: Building Efficient Databases
-----Original Message-----
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
Date: 08 April 2002 21:52
|From the 'Data Management and Storage Internal" notes,
|
|Bitmapped Tablespace File Structure
|
|A new bitmapped tablespace file has the following structure:
|File Header 1 block
|Bitmapped File Space Header 1 block
|Head portion of of Bitmap Blocks N blocks
|Useful file blocks U units (A unit is a number
|of blocks)
|Tail portion of Bitmap Blocks M blocks
|
--
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--
Author: Jonathan Lewis
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