Re: B-Heaps

From: "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
To: "Greg Smith" <greg(at)2ndquadrant(dot)com>, "Yeb Havinga" <yebhavinga(at)gmail(dot)com>
Cc: "Matthew Wakeling" <matthew(at)flymine(dot)org>, "Eliot Gable" <egable+pgsql-performance(at)gmail(dot)com>, "Robert Haas" <robertmhaas(at)gmail(dot)com>, <pgsql-performance(at)postgresql(dot)org>
Subject: Re: B-Heaps
Date: 2010-06-18 18:44:22
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Yeb Havinga <yebhavinga(at)gmail(dot)com> wrote:

> concerning gist indexes:
> 1) with larger block sizes and hence, larger # entries per gist
> page, results in more generic keys of those pages. This in turn
> results in a greater number of hits, when the index is queried, so
> a larger part of the index is scanned. NB this has nothing to do
> with caching / cache sizes; it holds for every IO model. Tests
> performed by me showed performance improvements of over 200%.
> Since then implementing a speedup has been on my 'want to do
> list'.

As I recall, the better performance in your tests was with *smaller*
GiST pages, right? (The above didn't seem entirely clear on that.)


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