I don't want to query exactly 81900 rows into set. I just want to fetch 50 or 100 rows at a time in a decreasing order of stime.(i.e 50 or 100 rows starting from last to end).
if we fetched sequentially, there is also problem in fetching all the records (select * from wan where kname='pluto' order by stime) it is taking more than 4~5 minutes. tried it on same table having more than 326054 records.
On 4/20/06, Merlin Moncure <mmoncure@gmail.com> wrote:> SELECT * FROM wan ORDER BY stime LIMIT 50 OFFSET 81900;
you need to try and solve the problem without using 'offset'. you could do:
BEGIN;
DECLARE crs cursor FOR SELECT * FROM wan ORDER BY stime;
FETCH ABSOLUTE 81900 in crs;
FETCH 49 in crs;
CLOSE crs;
COMMIT;
this may be a bit faster but will not solve the fundamental problem.
the more interesting question is why you want to query exactly 81900
rows into a set. This type of thinking will always get you into
trouble, absolute positioning will not really work in a true sql
sense. if you are browsing a table sequentially, there are much
better methods.
merlin