RE: Optimized WHERE UPPER(name) LIKE UPPER('%p_name%')
| От | HALAT-PRUVOT SYLVIE |
|---|---|
| Тема | RE: Optimized WHERE UPPER(name) LIKE UPPER('%p_name%') |
| Дата | |
| Msg-id | 1c16db2fbba145dd900f0fe14849bf99@region-academique-occitanie.fr обсуждение исходный текст |
| Ответ на | Optimized WHERE UPPER(name) LIKE UPPER('%p_name%') (Loles <lolesft@gmail.com>) |
| Список | pgsql-admin |
Hi,
You can try with extension pg_tgrm to create gin index to use LIKE with ‘%expression%’
https://www.postgresql.org/docs/current/pgtrgm.html
https://mazeez.dev/posts/pg-trgm-similarity-search-and-fast-like
Sylvie Halat
De : Loles <lolesft@gmail.com>
Envoyé : lundi 30 octobre 2023 14:28
À : pgsql-admin@postgresql.org
Objet : Optimized WHERE UPPER(name) LIKE UPPER('%p_name%')
Hi!
A question about query optimization.
We have a simple query with several tables joined.
We have seen performance down when we use WHERE UPPER(name) LIKE UPPER('%Alice%') in the condition.
If we compare with WHERE UPPER(name) = UPPER('Alice') it runs very fast.
We have tried an index on the name field, an UPPER(name) expression index, a GIN index, etc. but nothing seems to work.
We need to optimize the condition WHERE UPPER(name) LIKE UPPER('%p_name%)
Any ideas?
Thanks!!
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