I think you'll find that generally the initial amount of file allocated is 64K (including the two header blocks) - the fact that you noted the bitmap was in the "next 6 blocks" suggests you were using an 8K block size.
The actual space allocated at file creation time is dependent on the file size, block size, and extent size. If you have a very small block size, very small extents, and extremely large files then Oracle may allocate an extra 64K (and I guess further multiples of 64K if necessary). If you create a file that is extremely small, then Oracle can allocate a single block for the bitmap and, if the file then grows, further sections of bitmap may be allocated in the middle of the file. I have yet to find out what the typical behaviour is for a tablespace with a 32K block. I would guess that the total file header would be 128K rather than 64K - 2 blocks for the general file header, 2 blocks for the bitmap. Could anyone confirm that, thanks ? 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 22:55 | |The bitmap itself is stored in 6 blocks after that , blocks 3 thru 8. Each of the bit tracks four extents represented by an F (hex for 15). |0000000000000000 0000000000000000 0000000000000000 00000000000000000 | {further details cut} | |When I did my test and I had raised the question at that time that the max data that can be stored is 129024 * 6 (blocks) = 774144 extents and if the extent size for argument is 1K then the max size the bitmap can track is 774144K or 7M data file. I have not found an answer yet. | -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Jonathan Lewis INET: [EMAIL PROTECTED] 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: [EMAIL PROTECTED] (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).
