Re: Amount of space used by a segment changes when datafile size changed in ASSM tablespace
- From: Hemant K Chitale <hemantkchitale@xxxxxxxxx>
- To: pjhoraclel@xxxxxxxxx
- Date: Mon, 8 Apr 2013 23:52:31 +0800
Looks like an OEM bug. Oracle doesn't change the size of a pre-existing
extent.
Sent from my android phone.
On Apr 8, 2013 11:32 PM, "Peter Hitchman" <pjhoraclel@xxxxxxxxx> wrote:
> 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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