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About TSearch2 Performance

Hi,

Is there any performance diference between the following SQL commands:

SELECT * FROM documents WHERE content_ix @@ to_tsquery('word1&word2|word3');

SELECT * FROM documents WHERE content_ix @@ to_tsquery('word1') AND
content_ix @@ to_tsquery('word2') OR content_ix @@ to_tsquery('word3');

I'm having to do this on some complex querys to put LIKEs between some
ts_querys.
Does anyone has such experience?

Thanks in advance,

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Diogo Biazus
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http://www.ikono.com.br

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Nov 12 '05 #1
3 1939
First one will be a bit faster

Diogo Biazus wrote:
Hi,

Is there any performance diference between the following SQL commands:

SELECT * FROM documents WHERE content_ix @@
to_tsquery('word1&word2|word3');

SELECT * FROM documents WHERE content_ix @@ to_tsquery('word1') AND
content_ix @@ to_tsquery('word2') OR content_ix @@ to_tsquery('word3');

I'm having to do this on some complex querys to put LIKEs between some
ts_querys.
Does anyone has such experience?

Thanks in advance,


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Teodor Sigaev E-mail: te****@sigaev.ru
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Nov 12 '05 #2
Teodor Sigaev wrote:
First one will be a bit faster

Diogo Biazus wrote:
Hi,

Is there any performance diference between the following SQL commands:

SELECT * FROM documents WHERE content_ix @@
to_tsquery('word1&word2|word3');

SELECT * FROM documents WHERE content_ix @@ to_tsquery('word1') AND
content_ix @@ to_tsquery('word2') OR content_ix @@ to_tsquery('word3');

I'm having to do this on some complex querys to put LIKEs between
some ts_querys.
Does anyone has such experience?

Thanks in advance,

What do those @@ do for the statement?

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"You are behaving like a man",
is an insult from some women,
a compliment from an good woman.

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Nov 12 '05 #3
On Friday 24 October 2003 08:18, Dennis Gearon wrote:
Teodor Sigaev wrote:
First one will be a bit faster

Diogo Biazus wrote:
Hi,

Is there any performance diference between the following SQL commands:

SELECT * FROM documents WHERE content_ix @@
to_tsquery('word1&word2|word3');

SELECT * FROM documents WHERE content_ix @@ to_tsquery('word1') AND
content_ix @@ to_tsquery('word2') OR content_ix @@ to_tsquery('word3');

I'm having to do this on some complex querys to put LIKEs between
some ts_querys.
Does anyone has such experience?

Thanks in advance,


What do those @@ do for the statement?


That is an operator defined when tsearch2 is installed. It does comparison on
the types from tsearch2 (tsvector, tsquery).

Andy

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Nov 12 '05 #4

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