Re: Question slow query

På torsdag 12. januar 2017 kl. 03:15:59, skrev Patrick B <
patrickbakerbr(at)gmail(dot)com <mailto:patrickbakerbr(at)gmail(dot)com>>:
Hi guys,  
I've got a slow query, running at 25 seconds.
 
-> Bitmap Heap Scan on ja_notes r_1103088 (cost=234300.55..1254978.62
rows=553275 width=101) (actual time=1423.411..10572.549 rows=475646 loops=1)
Recheck Cond: (n_type = ANY ('{note,note_1,note_2}'::n_type[])) Filter:
(timezone('Etc/UTC'::text, d_modified) >= '2016-08-07 23:12:34'::timestamp
without time zone) Rows Removed by Filter: 13725231
 
 
As you can see, 13.725.231 rows were removed by Filter..
 
Should I create an index for this column?
d_modified              | timestamp with time zone | default
statement_timestamp() I tried but it didn't help... the query doesn't even hit
the index.

CREATE INDEX q ON test USING BTREE (d_modified);

Am I missing something? 

 
Yes, you've not shown us:
1. The query
2. The schema
3. Complete EXPLAIN-output
 
-- Andreas Joseph Krogh
CTO / Partner - Visena AS
Mobile: +47 909 56 963
andreas(at)visena(dot)com <mailto:andreas(at)visena(dot)com>
www.visena.com <https://www.visena.com>
<https://www.visena.com>