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I'm currently building indexing for pattern matching in PostgreSQL database. After reading some articles, I decided to use pg_trgm extension. But according to this documentation we can use both GIN or GIST index.

I'm just curious which index works better with pg_trgm.

1 Answer 1

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The answer depends on the query you want to optimize.

If the query looks like

SELECT ...
FROM ...
WHERE col % 'string'

a GIN index usually works better.

If the query looks like

SELECT ...
FROM ...
ORDER BY col <-> 'string'
LIMIT 1

you need to use a GiST index, because a GIN index cannot support that.

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  • I'm going to use LIKE operator, so it's GIN, isn't it? Commented Jan 26, 2022 at 9:48
  • Typically yes. Why don't you run a test with a bigger data set? Commented Jan 26, 2022 at 9:53
  • currently I'm building big mock data. but get this error when inserting stackoverflow.com/questions/10399727/… Commented Jan 26, 2022 at 10:08

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