index on ILIKE/LIKE - PostgreSQL 9.2 - Mailing list pgsql-general
| From | Lucas Possamai |
|---|---|
| Subject | index on ILIKE/LIKE - PostgreSQL 9.2 |
| Date | |
| Msg-id | CAE_gQfVrubFYDPGuVEiKS7Vn8NMQ9O-8NarR0xSOL+3Ae2BaQg@mail.gmail.com Whole thread Raw |
| Responses |
Re: index on ILIKE/LIKE - PostgreSQL 9.2
Re: index on ILIKE/LIKE - PostgreSQL 9.2 Re: index on ILIKE/LIKE - PostgreSQL 9.2 |
| List | pgsql-general |
Hi there!
I've got a simple but slow query:
SELECT DISTINCT title
FROM ja_jobs WHERE title ILIKE '%RYAN WER%'
and clientid = 31239 AND time_job > 1457826264
order BY title
limit 10
Explain analyze:
Limit (cost=5946.40..5946.41 rows=1 width=19) (actual time=2746.759..2746.772 rows=1 loops=1)
-> Unique (cost=5946.40..5946.41 rows=1 width=19) (actual time=2746.753..2746.763 rows=1 loops=1)
-> Sort (cost=5946.40..5946.41 rows=1 width=19) (actual time=2746.750..2746.754 rows=4 loops=1)
Sort Key: "title"
Sort Method: quicksort Memory: 25kB
-> Bitmap Heap Scan on "ja_jobs" (cost=49.02..5946.39 rows=1 width=19) (actual time=576.275..2746.609 rows=4 loops=1)
Recheck Cond: (("clientid" = 31239) AND ("time_job" > 1457826264))
Filter: (("title")::"text" ~~* '%RYAN WER%'::"text")
Rows Removed by Filter: 791
-> Bitmap Index Scan on "ix_jobs_client_times" (cost=0.00..49.02 rows=1546 width=0) (actual time=100.870..100.870 rows=795 loops=1)
Index Cond: (("clientid" = 31239) AND ("time_job" > 1457826264))
Total runtime: 2746.879 ms
Then, I created a trgm index:
CREATE INDEX ix_ja_jobs_trgm_gin ON public.ja_jobs USING gin (title gin_trgm_ops);
Explain analyze after the index: (Yes, I ran the analyze)
Limit (cost=389.91..389.91 rows=1 width=20) (actual time=3720.511..3720.511 rows=0 loops=1)
-> Unique (cost=389.91..389.91 rows=1 width=20) (actual time=3720.507..3720.507 rows=0 loops=1)
-> Sort (cost=389.91..389.91 rows=1 width=20) (actual time=3720.505..3720.505 rows=0 loops=1)
Sort Key: "title"
Sort Method: quicksort Memory: 25kB
-> Bitmap Heap Scan on "ja_jobs" (cost=385.88..389.90 rows=1 width=20) (actual time=3720.497..3720.497 rows=0 loops=1)
Recheck Cond: (("clientid" = 31239) AND ("time_job" > 1457826264) AND (("title")::"text" ~~ '%RYAN WER%'::"text"))
Rows Removed by Index Recheck: 4
-> BitmapAnd (cost=385.88..385.88 rows=1 width=0) (actual time=3720.469..3720.469 rows=0 loops=1)
-> Bitmap Index Scan on "ix_jobs_client_times" (cost=0.00..50.00 rows=1644 width=0) (actual time=0.142..0.142 rows=795 loops=1)
Index Cond: (("clientid" = 31239) AND ("time_job" > 1457826264))
-> Bitmap Index Scan on "ix_ja_jobs_trgm_gin" (cost=0.00..335.63 rows=484 width=0) (actual time=3720.213..3720.213 rows=32 loops=1)
Index Cond: (("title")::"text" ~~ '%RYAN WER%'::"text")
Total runtime: 3720.653 ms
so.. the query is still slow..
Do you guys know what can be done ? related to the ILIKE?
cheers
Lucas
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