From: | "Guillaume Smet" <guillaume(dot)smet(at)gmail(dot)com> |
---|---|
To: | "Andrew Dunstan" <andrew(at)dunslane(dot)net> |
Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: like/ilike improvements |
Date: | 2007-09-19 22:08:59 |
Message-ID: | 1d4e0c10709191508l4bc46452l4f29cc28411340c7@mail.gmail.com |
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Lists: | pgsql-hackers pgsql-patches |
On 9/19/07, Andrew Dunstan <andrew(at)dunslane(dot)net> wrote:
> Can you run the same set of tests in a single byte encoding like latin1?
Here are the results (each query was executed several times before this result):
** 8.1 **
cityvox_latin1=# SELECT e.numeve FROM evenement e WHERE e.libgeseve
ILIKE '%hocus pocus%';
numeve
-----------
900024298
87578
(2 rows)
Time: 135.877 ms
** 8.2 **
cityvox_latin1=# SELECT e.numeve FROM evenement e WHERE e.libgeseve
ILIKE '%hocus pocus%';
numeve
-----------
900024298
87578
(2 rows)
Time: 111.595 ms
** 8.3 **
cityvox_latin1=# SELECT e.numeve FROM evenement e WHERE e.libgeseve
ILIKE '%hocus pocus%';
numeve
-----------
900024298
87578
(2 rows)
Time: 160.582 ms
Results are quite surprising but there's no error, I checked them
several times...
If someone can point me to how I can profile query execution, I can
provide more information.
--
Guillaume
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