Re: index on ILIKE/LIKE - PostgreSQL 9.2 - Mailing list pgsql-general

[snp]

I created this test:

 

create table ja_jobs(id bigserial primary key, title varchar not null, clientid bigint not null, time_job bigint not null);

CREATE INDEX ix_ja_jobs_trgm_clientid_gin ON public.ja_jobs USING gin (title gin_trgm_ops, clientid);

--- insert some test-data

 

As you see, this uses the index (when casting clientid to bigint):

 

andreak=# explain analyze SELECT DISTINCT title  
FROM ja_jobs WHERE title ILIKE '%ras du%'
and clientid = 12::bigint AND time_job > 257826264
order BY title
limit 10;
                                                                      QUERY PLAN                                                                       
-------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=8.43..8.44 rows=1 width=32) (actual time=0.033..0.034 rows=1 loops=1)
   ->  Unique  (cost=8.43..8.44 rows=1 width=32) (actual time=0.032..0.032 rows=1 loops=1)
         ->  Sort  (cost=8.43..8.43 rows=1 width=32) (actual time=0.032..0.032 rows=1 loops=1)
               Sort Key: title
               Sort Method: quicksort  Memory: 25kB
               ->  Bitmap Heap Scan on ja_jobs  (cost=7.20..8.42 rows=1 width=32) (actual time=0.025..0.025 rows=1 loops=1)
                     Recheck Cond: (((title)::text ~~* '%ras du%'::text) AND (clientid = '12'::bigint))
                     Filter: (time_job > 257826264)
                     Heap Blocks: exact=1
                     ->  Bitmap Index Scan on ix_ja_jobs_trgm_clientid_gin  (cost=0.00..7.20 rows=1 width=0) (actual time=0.016..0.016 rows=1 loops=1)
                           Index Cond: (((title)::text ~~* '%ras du%'::text) AND (clientid = '12'::bigint))
 Planning time: 0.169 ms
 Execution time: 0.061 ms
(13 rows)

--

Andreas Joseph Krogh

CTO / Partner - Visena AS

Mobile: +47 909 56 963

andreas@visena.com

www.visena.com