Re: Performance for seq. scans

At 11:51 26/07/00 +0100, you wrote:
>Hi all,
>
>I've had a look over the docs and the FAQ and I can't see anything
>answering this, so here goes:
>
>I'm in the (slightly unusual, in a relational world) situation that
>the dominant query on my database is a wildcard search, so that no
>indexes can be used.  (E.g. select * from table_a where foo like
>'%bar%').

We were in a similar position and went for the 'Full Text Indexing" extra.
You'll find it in contrib/fulltextindex.
It creates a function which you call on a trigger to produce an index of
words for specified fields. These indexes do get _very_ large (one of ours
is ~800 MB), but it does work very well and speeds searches up enormously.

Steve

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