Optimizing Complex Queries

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От Ryan Ho
Тема Optimizing Complex Queries
Дата
Msg-id 5.0.2.1.0.20010615114811.00b1b1a0@pacific.net.sg
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Hi all,

I've got to set up a program that automatically does searches for up to
10000 members (batched once a week at night), and then email the results of
those searches to them. The search query is rather complex, requiring up to
5 subqueries, close to 10 tables, many joins, and some full-text searches.
I've done the indexing, and has changed the run-time variables of
postmaster (i.e. sort-mem and number of buffers), and vacuumed the database
regularly. Yet, it's still taking a couple of hours on a PIII 850 server
with 512MB RAM.

I've read that writing the search as a stored procedure improves
performance. If so, how significant is it and what affects the efficiency
gains? Also, I think full-text indexing will help, but it's not supported
in postgres natively right?

Thanks in advance
Ryan


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