Amount of space used by a segment changes when datafile size changed in ASSM tablespace
- From: Peter Hitchman <pjhoraclel@xxxxxxxxx>
- To: oracle-l <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 8 Apr 2013 16:31:19 +0100
Oracle Enterprise Edition 11.1.0.7.5
Linux 64 bit RHL 4.5
I have a question about space allocation in ASSM tablespaces.
I am using a 8KB block size and 8MB extents.
I started off with a single extent segment reported as using 9MB according
to OEM, I checked dba_data_files and dba_free_space_coalesced and the sum
of bytes used minus the total free bytes used agreed this figure.
When I increased the file size from 33MB to 40MB, the amount of space used
is reported as 16MB.
When I shrink the file to 33MB, the amount of space used goes back down to
9MB.
When I shrink the file to 32MB the amount of space used goes up to 16MB.
I feel I should understand this, but it is escaping me.
Regards
Pete
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