From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | Zdenek Kotala <Zdenek(dot)Kotala(at)Sun(dot)COM> |
Cc: | Andrew Dunstan <andrew(at)dunslane(dot)net>, pgsql-patches(at)postgresql(dot)org |
Subject: | Re: Fix for large file support |
Date: | 2007-04-06 17:04:08 |
Message-ID: | 14547.1175879048@sss.pgh.pa.us |
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Lists: | pgsql-hackers pgsql-patches |
Zdenek Kotala <Zdenek(dot)Kotala(at)Sun(dot)COM> writes:
> Andrew Dunstan wrote:
>> Or give better performance?
> Yes. List of chunks is stored as linked list and for some operation
> (e.g. expand) are all chunks opened and their size is checked. On big
> tables it takes some time. For example if you have 1TB big table and you
> want to add new block you must go and open all 1024 files.
Indeed, but that would be far more effectively addressed by fixing the
*other* code path that doesn't segment at all (the
LET_OS_MANAGE_FILESIZE option, which is most likely broken these days
for lack of testing). I don't see the point of a halfway measure like
increasing RELSEG_SIZE.
regards, tom lane
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