Author:            DJMURRAY
Subject:            Max Extents of 121 - Some Clarification
Modified:           11 Sep 94 



There seems to be some confusion as to what is the maximum number of
extents an object can have. Some people seem to think this is port
specific.

		IT IS ***NOT*** PORT SPECIFIC

The maximum number of extents an object can have is governed by the blocksize
of the database, as follows:

		Database			Maximum
		Blocksize			# extents
		---------			---------

		  1k				   57
		  2k				  121
		  4k				  249
		etc...

So for example a database with 4k blocksize on a UNIX box has a maximum number
of extents of 249 not 121.

The reason for this is that the extent map is stored in the segment header
(ie first block of the object). So the bigger the header block (database
blocksize) the more extents it can map.