| From: | Josh Berkus <josh(at)agliodbs(dot)com> |
|---|---|
| To: | "David Olbersen" <DOlbersen(at)stbernard(dot)com>, <pgsql-sql(at)postgresql(dot)org> |
| Cc: | <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: Help with LIKE |
| Date: | 2003-03-20 21:55:32 |
| Message-ID: | 200303201355.32718.josh@agliodbs.com |
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| Thread: | |
| Lists: | pgsql-performance pgsql-sql |
David,
> I have a table with 8,628,633 rows that I'd LIKE to search (ha ha).
>
> I have a very simple query:
> SELECT * FROM tableA WHERE column1 LIKE '%something%';
That's what's called an "unanchored text search". That kind of query cannot
be indexed using a regular index.
What you need is called "Full Text Indexing" or "Full Text Search". Check
out two resources:
1) contrib/tsearch in your PostgreSQL source code;
2) OpenFTS (www.openfts.org).
--
-Josh Berkus
Aglio Database Solutions
San Francisco
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