Hallo All!
I have database with follow structure:
CREATE TABLE "article" ( "id" character varying(15) NOT NULL, "obj_kod" character varying(15),
"popis"character varying(80), "net_price" float4, "our_price" float4, "quantity" int2, "group1"
charactervarying(40) DEFAULT 'ine', "group2" character varying(40), "pic1" character varying(10) DEFAULT
'noname.jpg', "pic2" character varying(10) DEFAULT 'noname.jpg', "alt1" character varying(15), "alt2"
charactervarying(15), "zisk" int2);
CREATE UNIQUE INDEX "article_pkey" on "article" using btree ( "id"
"varchar_ops" );
and with 1000000 rows. Postgres deamon run on 2xPentiumII 330Mhz with
SCSI disk where is
this database store. But I think that select * from article where id
like 'something%' is very slow
(some minutes) and query as: select * from article where id='something'
is very slow too.
I don't know where is a problem a I would like optimalise this, but how
can I do it?
When I use hash except btree, query as: select * from article where
id='something' is fast but
select * from article where id='something%' is very slow.
Can I index some columns externaly? For example: psql index database
table col.
Or postgresql make indexes automaticly?
How can I see that postgres use/or no use index on some query? It is
possible?
Thank you every reply, Davy!
