| From: | "Marc Mamin" <M(dot)Mamin(at)intershop(dot)de> |
|---|---|
| To: | <ktm(at)rice(dot)edu> |
| Cc: | "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Oleg Bartunov" <oleg(at)sai(dot)msu(dot)su>, "Teodor Sigaev" <teodor(at)sigaev(dot)ru>, <pgsql-hackers(at)postgreSQL(dot)org>, <jesper(at)krogh(dot)cc> |
| Subject: | Re: Qual evaluation cost estimates for GIN indexes |
| Date: | 2012-02-20 14:32:11 |
| Message-ID: | C4DAC901169B624F933534A26ED7DF310861B3CE@JENMAIL01.ad.intershop.net |
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| Thread: | |
| Lists: | pgsql-hackers |
> Hi Marc,
>
> Do you happen to know in which function, the extra time for the toast
> storage is spent -- zlib compression? I saw a mention of the LZ4
> compression
> algorithm that is BSD licensed as a Google summer of code project:
>
> http://code.google.com/p/lz4/
>
> that compresses at almost 7X than zlib (-1) and decompresses at 6X.
>
> Regards,
> Ken
Hi,
No,
and my concern is more about cost estimation for ts_queries / gin
indexes as for the detoasting issue.
regards,
Marc Mamin
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