From: | Tomek Walkuski <tomek(dot)walkuski(at)gmail(dot)com> |
---|---|
To: | pgsql-performance(at)postgresql(dot)org |
Subject: | SeqScan with full text search |
Date: | 2012-04-16 14:02:13 |
Message-ID: | 5afd048c-19e2-4a81-8439-bc09839d29dc@n5g2000vbf.googlegroups.com |
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Thread: | |
Lists: | pgsql-performance |
Hello group!
I have query like this:
SELECT
employments.candidate_id AS candidate_id,
SUM(TS_RANK(employers.search_vector, TO_TSQUERY('simple', 'One:* |
Two:* | Three:* | Four:*'), 2)) AS ts_rank
FROM
employments
INNER JOIN
employers ON employments.employer_id = employers.id
AND
employers.search_vector @@ TO_TSQUERY('simple', 'One:* | Two:* |
Three:* | Four:*')
GROUP BY
candidate_id;
And it results with this:
http://explain.depesz.com/s/jLM
The JOIN between employments and employers is the culprit. I'm unable
to get rid of the seq scan, and setting enable_seqscan to off makes
things even worse.
Is there any way to get rid of this JOIN?
What info should I post to debug this easier?
Thanks!
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