Re: Improving the Performance of Full Table Updates

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От Heikki Linnakangas
Тема Re: Improving the Performance of Full Table Updates
Дата
Msg-id 470A3D34.1020201@enterprisedb.com
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Ответ на Re: Improving the Performance of Full Table Updates  (Tom Lane <tgl@sss.pgh.pa.us>)
Ответы Re: Improving the Performance of Full Table Updates  (Tom Lane <tgl@sss.pgh.pa.us>)
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Tom Lane wrote:
> "Heikki Linnakangas" <heikki@enterprisedb.com> writes:
>> * mmap the WAL segments, instead of using the slru buffers.
> 
> This one's almost certainly a nonstarter, for lack of any portable way
> to control when writes happen.

For flushing, there's msync, which I believe is quite portable.

We mustn't write data pages before the WAL hits the disk, but we don't
have any such limitation for WAL.

--  Heikki Linnakangas EnterpriseDB   http://www.enterprisedb.com

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