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Re: Does a datafile know *its* blocksize ?

From: Brian Peasland <dba_at_nospam.peasland.net>
Date: Tue, 5 Sep 2006 12:27:35 GMT
Message-ID: <J54DA1.BM4@igsrsparc2.er.usgs.gov>


Spendius wrote:
> Hi,
> Is the info regarding the different blocksizes in a DB
> only stored in the dictionary or is this info stored
> somewhere in the datafiles as well ? And does it
> depend on the tablespace and/or segment space
> management (LOCALLY MANAGED/SEGMENT
> SPACE MGT AUTO/MANUAL etc.) ?
>
> Thanks.
> Spendius
>

The tablespace's block size does not have any correlation to its extent allocation algorithm or segment space management.

Each datafile has a *header* which contains a few bits of information. Among those bits are the tablespace name the datafile belongs to as well as the block size for that tablespace.

HTH,
Brian

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Brian Peasland
dba_at_nospam.peasland.net
http://www.peasland.net

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Received on Tue Sep 05 2006 - 07:27:35 CDT

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