On 16/07/10 05:22, Howard Rogers wrote:
OK, Tom: I did actually account for the number of rows difference
before I posted, though I accept I didn't show you that. So here goes:
Tom's good, but his mind-reading powers aren't what they used to be :-)
ims=# select count(*)
ims-# from search_rm
ims-# where to_tsvector('english', textsearch) @@
to_tsquery('english', 'wommmman& batt& ftxa')
ims-# limit 20;
count
-------
0
(1 row)
Time: 0.593 ms
ims=# select count(*)
from search_rm
where to_tsvector('english', textsearch) @@ to_tsquery('english',
'wommmman& batt& ftx1')
limit 20;
count
-------
0
(1 row)
Time: 489.362 ms
Both queries return zero rows. One takes an awful lot longer than the
other.
And how many matches do you get for each term? Is it equally slow if you
search for 'wommman & batt && pzsdja' vs '... pzsdj1'?
I'm assuming pzsdja/1 aren't valid tokens of course...
--
Richard Huxton
Archonet Ltd
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