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Re: Strange optimization - xmin,xmax compression :)

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: pasman pasmański <pasman(dot)p(at)gmail(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Strange optimization - xmin,xmax compression :)
Date: 2010-12-18 02:46:55
Message-ID: AANLkTimvfXyB3C-C=1=U3k0CAqLtgCrAAkRbNKvgLkFt@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-performance
2010/12/6 pasman pasmański <pasman(dot)p(at)gmail(dot)com>:
> hello.
>
> i tested how are distributed values xmin,xmax on pages.
> in my tables . typically there are no more than 80 records
> on pages.
>
> maybe its possible to compress xmin & xmax values to
> 1 byte/per record (+table of transactions per page)?
> its reduce the space when more than 1 record is
> from the same transaction.

Not a bad idea, but not easy to implement, I think.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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