Multiple versus a single collection search with Verity

I have a simple question about Verity search collection.
We have been using verity for a number of years, but we have
never done
any real performance testing in regards to a single
collection versus many.
All documentation and articles argue for multiple small
collections when
indexing for better indexing performance. But what is the
performance
hit when searching 2 collections instead of 1 combined
collection?
How about 4 collections instead of 1?
Thanks
Don Vaillancourt
Director of Software Development
WEB IMPACT INC.
phone: 416-815-2000 ext. 245
fax: 416-815-2001
toll free: 866-319-1573 ext. 245
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We are searching 7 collections with some 100.000 documents. I
have not noticed any performance issues compared to searching only
one collection.

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l_data string_tab := string_tab();
n NUMBER;
BEGIN
LOOP
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SELECT rn, col FROM(
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SELECT DISTINCT
t.rn, t.col
FROM
t,
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t,
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GROUP BY t.rn, t.col, cnt_x
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