From: Pierre C <lists@peufeu.com>
To: mmoncure@gmail.com
To: sfkeller@gmail.com
To: pgsql-performance@postgresql.org
To: m1ott@hsr.ch
Subject: Re: FW: KVP table vs. hstore - hstore performance (Was: Postgres NoSQL emulation)
Date: Mon, 23 May 2011 12:53:57 +0200
Message-ID: <op.vvxkj7o8eorkce@apollo13> (raw)
In-Reply-To: <99EECF01B5C87A498318776AB7E4A78D3640F59E26@sid00102.hsr.ch>
References: <BANLkTi=LjFTnn8hLwBZc1c87Vq+pw02+jQ@mail.gmail.com>
<4DD06EF3.7030003@postnewspapers.com.au>
<BANLkTimdGR4X0uMMyMwtvy9Uex-zeMtVCQ@mail.gmail.com>
<BANLkTintNbJZw-hnVpy8q5jLW1__E9BY1w@mail.gmail.com>
<99EECF01B5C87A498318776AB7E4A78D3640F59E26@sid00102.hsr.ch>
> Hi Merlin
>
> The analyze command gave the following result:
>
> On the KVP table:
> Index Scan using kvpidx on bench_kvp (cost=0.00..8.53 rows=1 width=180)
> (actual time=0.037..0.038 rows=1 loops=1)
> Index Cond: (bench_id = '200000_200000'::text)
> Total runtime: 0.057 ms
>
> And on the Hstore table:
> Bitmap Heap Scan on bench_hstore (cost=32.22..3507.54 rows=1000
> width=265) (actual time=145.040..256.173 rows=1 loops=1)
> Recheck Cond: (bench_hstore @> '"bench_id"=>"200000_200000"'::hstore)
> -> Bitmap Index Scan on hidx (cost=0.00..31.97 rows=1000 width=0)
> (actual time=114.748..114.748 rows=30605 loops=1)
> Index Cond: (bench_hstore @> '"bench_id"=>"200000_200000"'::hstore)
> Total runtime: 256.211 ms
>
> For Hstore I'm using a GIST index.
>
Try to create a btree index on "(bench_hstore->bench_id) WHERE
(bench_hstore->bench_id) IS NOT NULL".
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To: pgsql-performance@postgresql.org
Cc: lists@peufeu.com, mmoncure@gmail.com, sfkeller@gmail.com, m1ott@hsr.ch
Subject: Re: FW: KVP table vs. hstore - hstore performance (Was: Postgres NoSQL emulation)
In-Reply-To: <op.vvxkj7o8eorkce@apollo13>
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