| From: | Greg Stark <stark(at)mit(dot)edu> |
|---|---|
| To: | Oleg Bartunov <obartunov(at)gmail(dot)com> |
| Cc: | Alexander Korotkov <aekorotkov(at)gmail(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Peter Geoghegan <pg(at)heroku(dot)com>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Tomas Vondra <tv(at)fuzzy(dot)cz>, Pgsql Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: jsonb and nested hstore |
| Date: | 2014-03-13 12:42:00 |
| Message-ID: | CAM-w4HPwZCtjMr47Z0hH+uTx3ZuiTRhWSBwfiXwfAzBnRtaeTA@mail.gmail.com |
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| Lists: | pgsql-hackers |
Fwiw the jsonb data doesn't actually seem to be any smaller than text
json on this data set (this is avg(pg_column_size(col)) and I checked,
they're both using the same amount of toast space)
jsonb | json
-------+-------
813.5 | 716.3
(1 row)
It's still more than 7x faster in cpu costs though:
stark=# select count(attrs->'properties'->>'STREET') from citylots;
count
--------
196507
(1 row)
Time: 1026.678 ms
stark=# select count(attrs->'properties'->>'STREET') from citylots_json;
count
--------
196507
(1 row)
Time: 7418.010 ms
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