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Re: MongoDB 3.2 beating Postgres 9.5.1? - Mailing list pgsql-general

From Teodor Sigaev
Subject Re: MongoDB 3.2 beating Postgres 9.5.1?
Date
Msg-id 578DFEC9.5050908@sigaev.ru
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In response to MongoDB 3.2 beating Postgres 9.5.1?  (Paul Jones <pbj@cmicdo.com>)
Responses Re: MongoDB 3.2 beating Postgres 9.5.1?  (<pbj@cmicdo.com>)
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> CREATE INDEX json_tables_idx ON json_tables USING GIN (data jsonb_path_ops);
> Bitmap Heap Scan on json_tables  (cost=113.50..37914.64 rows=10000 width=1261)
> (actual time=2157.118..1259550.327 rows=909091 loops=1)
>     Recheck Cond: (data @> '{"name": "AC3 Case Red"}'::jsonb)
>     Rows Removed by Index Recheck: 4360296
>     Heap Blocks: exact=37031 lossy=872059
Hmm, looks like too small work_mem because lossy heap block count  is too big.


--
Teodor Sigaev                                   E-mail: teodor@sigaev.ru
                                                    WWW: http://www.sigaev.ru/

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