From: | "Phoenix Kiula" <phoenix(dot)kiula(at)gmail(dot)com> |
---|---|
To: | "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | "Michael Glaesemann" <grzm(at)seespotcode(dot)net>, "PG-General Mailing List" <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Timestamp indexes (why ">" or "between" does not use index?) |
Date: | 2008-02-16 16:13:32 |
Message-ID: | e373d31e0802160813s78d7534ds71fa6336ba451339@mail.gmail.com |
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Lists: | pgsql-general |
This table is vacuumed and analyzed every hour, so yes, it's been
analyzed recently.
These are the EXPLAIN ANALYZE outputs for both the equality condition
and the greater than condition:
orguser=# explain analyze select alias from clientswhere modify_date =
'2008-01-01' ;
QUERY PLAN
-----------------------------------------------------------------------------------------------------------------------------
Index Scan using new_idx_modify_date on clients (cost=0.00..30.23
rows=8 width=10) (actual time=0.136..0.136 rows=0 loops=1)
Index Cond: (modify_date = '2008-01-01 00:00:00'::timestamp without
time zone)
Total runtime: 0.220 ms
(3 rows)
Time: 2.832 ms
orguser=# explain analyze select alias from clientswhere modify_date >
'2008-01-01' ;
QUERY PLAN
------------------------------------------------------------------------------------------------------------------
Seq Scan on clients (cost=0.00..237043.09 rows=136617 width=10)
(actual time=0.391..4007.188 rows=148225 loops=1)
Filter: (modify_date > '2008-01-01 00:00:00'::timestamp without time zone)
Total runtime: 4539.242 ms
(3 rows)
Time: 4539.850 ms
Welcome any thoughts. Thanks!
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