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Re: patch submission: truncate trailing nulls from heap rows to reduce the size of the null bitmap

From: Josh Berkus <josh(at)agliodbs(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Re: patch submission: truncate trailing nulls from heap rows to reduce the size of the null bitmap
Date: 2012-05-03 01:01:38
Message-ID: 4FA1D8F2.8000009@agliodbs.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On 5/2/12 10:20 AM, Jameison Martin wrote:
> Attached are the following as per various requests:
> 	* test_results.txt: the performance benchmarking results, 
> 
> 	* TestTrailingNull.java: the performance benchmarking code, with a few additional scenarios as per various requests
> 
> 	* hardinfo_report.txt: some information about the hardware and OS of the system on which the benchmarks were run, and
> 
> 	* postgresql.conf: the postgresql.conf used when running benchmarks. Note that the changes made to the vanilla postgresql.conf can be identified by looking for the string 'jamie' in the file I attached (there aren't that many)

Nice, thanks.  I'll try some of my own tests when I get a chance; I have
a really good use-case for this optimization.

-- 
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com

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