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Re: [HACKERS] Patch: Write Amplification Reduction Method (WARM) - Mailing list pgsql-hackers

From Alvaro Herrera
Subject Re: [HACKERS] Patch: Write Amplification Reduction Method (WARM)
Date
Msg-id 20170223180339.sp6dkumsklt44kys@alvherre.pgsql
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In response to Re: [HACKERS] Patch: Write Amplification Reduction Method (WARM)  (Bruce Momjian <bruce@momjian.us>)
Responses Re: [HACKERS] Patch: Write Amplification Reduction Method (WARM)  (Bruce Momjian <bruce@momjian.us>)
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Bruce Momjian wrote:

> As I remember, WARM only allows
> a single index-column change in the chain.  Why are you seeing such a
> large performance improvement?  I would have thought it would be that
> high if we allowed an unlimited number of index changes in the chain.

The second update in a chain creates another non-warm-updated tuple, so
the third update can be a warm update again, and so on.

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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