Hello 2010/8/12 Georgi Ivanov <georgi.r.ivanov@xxxxxxxxx>: > Hi, > I have query like this > Select * from tabelname limit 10 OFFSET 10; > > If i increase the OFFSET to 1000 for example, the query runs slower . The > bigger is OFFSET the slower is the query. > sure - database have to process all rows and skip a first n of result. This method isn't very efective. > This is standard pagination feature i use for my website. > Actually the query is little bit more complex than this, but it is generally > a > select with a join. > > So i wander if there is a way to speed up this kind of query ? > > I'm now reading about windowing functions , but I'm not sure this is the way > to go for this feature. > yes, you have to store a last primary key on page. Then if you wont to show a next page, you have to select like SELECT * FROM tablename WHERE id > last_primary_key_on_previous_page LIMIT 10. When this method isn't possible, then you have to ensure the fast processing of query without OFFSET. Maybe you have to add index, increate a work_mem, ... Regards Pavel Stehule > > -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
