Hi,
I want to realize a Full Text Search with the tsearch2 extension. It should find similar sentences.
I used my own trigger to store the tsvector of the sentences and I created a usual gist index on them.
I have to to use many OR statements with a low set of arguments, what heavy damages the performance.
My former query looked like this:
SELECT strip(to_tsvector('The tiger is the largest cat species, reaching a total body length of up to 3.3 m and weighing up to 306 kg.'));
strip
----------------------------------------------------------------------------------------------
'3.3' '306' 'bodi' 'cat' 'kg' 'largest' 'length' 'm' 'reach' 'speci' 'tiger' 'total' 'weigh'
(1 row)
SELECT * FROM tablename WHERE vector @@ to_tsquery('speci & tiger & total & weigh') AND vector @@ to_tsquery('largest & length & m & reach') AND vector @@ to_tsquery('3.3 & 306 & bodi & cat & kg');
And thats very slow.
Is there a better solution like a functional index?
Thank you for your help.
Janek Sendrowski
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