Re: Proposed Patch to Improve Performance of Multi-Batch Hash Join for Skewed Data Sets

From: Joshua Tolley <eggyknap(at)gmail(dot)com>
To: "Lawrence, Ramon" <ramon(dot)lawrence(at)ubc(dot)ca>
Cc: pgsql-hackers(at)postgresql(dot)org, Bryce Cutt <pandasuit(at)gmail(dot)com>
Subject: Re: Proposed Patch to Improve Performance of Multi-Batch Hash Join for Skewed Data Sets
Date: 2008-11-05 14:48:50
Message-ID: 20081105144850.GA22181@polonium.part.net
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On Mon, Oct 20, 2008 at 03:42:49PM -0700, Lawrence, Ramon wrote:
> We propose a patch that improves hybrid hash join's performance for large
> multi-batch joins where the probe relation has skew.

I also recommend modifying docs/src/sgml/config.sgml to include the
enable_hashjoin_usestatmcvs option.

- Josh / eggyknap

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