Re: Compressing WAL

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От Bruce Momjian
Тема Re: Compressing WAL
Дата
Msg-id 200504110112.j3B1Cf018664@candle.pha.pa.us
обсуждение исходный текст
Ответ на Compressing WAL  ("Jim C. Nasby")
Ответы Re: Compressing WAL  ("Jim C. Nasby")
Re: Compressing WAL  (Simon Riggs)
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Compressing WAL  ("Jim C. Nasby", )
 Re: Compressing WAL  (Bruce Momjian, )
  Re: Compressing WAL  ("Jim C. Nasby", )
  Re: Compressing WAL  (Simon Riggs, )
   Re: Compressing WAL  (Bruce Momjian, )
 Re: Compressing WAL  ("Qingqing Zhou", )
Jim C. Nasby wrote:
> Maybe better for -hackers, but here it goes anyway...
>
> Has anyone looked at compressing WAL's before writing to disk? On a
> system generating a lot of WAL it seems there might be some gains to be
> had WAL data could be compressed before going to disk, since today's
> machines are generally more I/O bound than CPU bound. And unlike the
> base tables, you generally don't need to read the WAL, so you don't
> really need to worry about not being able to quickly scan through the
> data without decompressing it.

I have never heard anyone talk about it, but it seems useful.  I think
compressing the page images written on first page modification since
checkpoint would be a big win.

Is this a TODO?

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  Bruce Momjian                        |  http://candle.pha.pa.us
                 |  (610) 359-1001
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