| From: | Josh Berkus <josh(at)agliodbs(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Gavin Flower <GavinFlower(at)archidevsys(dot)co(dot)nz>, Peter Geoghegan <pg(at)heroku(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Stephen Frost <sfrost(at)snowman(dot)net>, Robert Haas <robertmhaas(at)gmail(dot)com>, Kevin Grittner <kgrittn(at)ymail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, Larry White <ljw1001(at)gmail(dot)com> |
| Subject: | Re: jsonb format is pessimal for toast compression |
| Date: | 2014-08-15 00:06:10 |
| Message-ID: | 53ED4EF2.3060304@agliodbs.com |
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| Lists: | pgsql-hackers |
On 08/14/2014 04:47 PM, Josh Berkus wrote:
> thetype | colsize_distribution
> ---------+----------------------------
> json | {1777,1803,1890,1940,4424}
> jsonb | {5902,5926,5978,6002,6208}
Just realized my query was counting the whole row size instead of just
the column size. Here's just the JSON column:
Before changing to to INT_MAX:
thetype | colsize_distribution
---------+----------------------------
json | {1741,1767,1854,1904,2292}
jsonb | {3551,5866,5910,5958,6168}
After:
thetype | colsize_distribution
---------+----------------------------
json | {1741,1767,1854,1904,2292}
jsonb | {3515,3543,3636,3690,4038}
So that did improve things, just not as much as we'd like.
--
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com
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