From: Christian Weyer <christian.weyer@thinktecture.com>
To: Josh Berkus <josh@agliodbs.com>
To: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: Unexpected (bad) performance when querying indexed JSONB column
Date: Sun, 1 Feb 2015 21:19:29 +0000
Message-ID: <BC4E7C7F-86CB-441A-ABCE-6E0837AA1B65@thinktecture.com> (raw)
In-Reply-To: <54CE954F.7070904@agliodbs.com>
References: <7F9BEAD7-C190-4E21-8240-04687FA88435@thinktecture.com>
<WM!3b9b688279bfaf852b09eb38e12d59633671a1b1dacc67e4f7be92553c116d3655cd62355ebe242eb4ae45275d2a5848!@asav-2.01.com>
<54CE954F.7070904@agliodbs.com>
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On 01.02.15 22:06, "Josh Berkus" <josh@agliodbs.com> wrote:
>Please send us the output of EXPLAIN ( ANALYZE ON, BUFFERS ON ) so that
>we can see what the query is actually doing, rather than just what the
>plan was.
>
>--
>Josh Berkus
>PostgreSQL Experts Inc.
>http://pgexperts.com
Sure. Here we go:
"Bitmap Heap Scan on articles (cost=16.25..135.64 rows=33 width=427)
(actual time=6.425..43.603 rows=18584 loops=1)"
" Recheck Cond: (data @> ‘{"locked": true}'::jsonb)"
" Heap Blocks: exact=1496"
" Buffers: shared hit=1504"
" -> Bitmap Index Scan on idx_data (cost=0.00..16.24 rows=33 width=0)
(actual time=6.090..6.090 rows=18584 loops=1)"
" Index Cond: (data @> ‘{"locked": true}'::jsonb)"
" Buffers: shared hit=8"
"Planning time: 0.348 ms"
"Execution time: 47.788 ms"
Thanks for looking into this.
-C.
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To: pgsql-performance@postgresql.org
Cc: christian.weyer@thinktecture.com, josh@agliodbs.com
Subject: Re: Unexpected (bad) performance when querying indexed JSONB column
In-Reply-To: <BC4E7C7F-86CB-441A-ABCE-6E0837AA1B65@thinktecture.com>
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