Index not being used
От | Ralph Smith |
---|---|
Тема | Index not being used |
Дата | |
Msg-id | 76FE42D1-7793-41CC-B756-1CA8034C08F8@u.washington.edu обсуждение исходный текст |
Ответы |
Re: Index not being used
|
Список | pgsql-general |
I'm confused. Shouldn't this index be used?
(It's running on v7.4.7)
airburst=> \d stats2
Table "public.stats2"
Column | Type | Modifiers
-----------+-----------------------+-----------
lab | character varying(30) |
name | character varying(50) |
status | character varying(40) |
eventtime | integer |
username | character varying(30) |
pkey | character varying(60) |
Indexes:
"stats2_etime_index" btree (eventtime)
airburst=> \d stats2_etime_index
Index "public.stats2_etime_index"
Column | Type
-----------+---------
eventtime | integer
btree, for table "public.stats2"
airburst=> explain select count(*) from stats2 where eventtime > 1167638400 ;
QUERY PLAN
-----------------------------------------------------------------------
Aggregate (cost=185247.97..185247.97 rows=1 width=0)
-> Seq Scan on stats2 (cost=0.00..179622.45 rows=2250205 width=0)
Filter: (eventtime > 1167638400)
(3 rows)
Thanks,
Ralph
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