| From: | Christian Weyer <christian(dot)weyer(at)thinktecture(dot)com> |
|---|---|
| To: | Josh Berkus <josh(at)agliodbs(dot)com>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: Unexpected (bad) performance when querying indexed JSONB column |
| Date: | 2015-02-01 21:19:29 |
| Message-ID: | BC4E7C7F-86CB-441A-ABCE-6E0837AA1B65@thinktecture.com |
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| Lists: | pgsql-performance |
On 01.02.15 22:06, "Josh Berkus" <josh(at)agliodbs(dot)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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