Still wondering -- sql server full text search

sql server full text search : Still wondering

rn
9/15/2006 11:37:30 AM

What was the verdict on the two ways to perform the full-text query,
contains vs. containstable?

It seemed the original poster found that containstable worked faster and
wanted to know if was essentially the same query. The question also was
why did the containstable work faster.

It didn't seem like those two questions were really answered. It seemed
like the original poster had found a faster way to do the query, and
then the discussion went on to why the contains method was slow and some
other workarounds. What was wrong with the containstable method?

Should we all use constainstable instead of contains? Is there a flaw
in the query optimizer?

Can we keep this thread going? It seems important.

rn
9/15/2006 12:14:31 PM

Somehow I created a new thread by mistake. I meant to append this to
the thread:

Performance issue with CONTAINS
From: boblotz2001
Date Posted: 9/5/2006 2:05:00 PM

Hilary Cotter
9/15/2006 4:45:38 PM

ContainsTable is faster than Contains because
1) it only returns two columns key and rank
2) you can limit the number of results returned by the full-text search
engine by the top_n_by_rank parameter.

If you join it against the base table without using the top_n_by_rank
parameter there are no significant performance improvements.

--
Hilary Cotter
Director of Text Mining and Database Strategy
RelevantNOISE.Com - Dedicated to mining blogs for business intelligence.

This posting is my own and doesn't necessarily represent RelevantNoise's
positions, strategies or opinions.

Looking for a SQL Server replication book?
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[quoted text, click to view]

rn
9/16/2006 11:56:48 AM

That makes sense about the "top" parameter, but the original poster's
example did not seem to use a "top" parameter, yet achieved dramatic
performance improvement.

It seems there is still a mystery about the original poster's example
that needs to be investigated further.

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