hello
I looked through a lot of previous messages, found many related
messages, but didn't find a solution to my problem.
I have a simple table of three fields,
timestamp datetime, reading1 real, and reading2 real, and
80k rows.
I have tried to create btree and hash indexes for the field timestamp, and
yes, have vacuumed it after that.
Explain still always tells me that it uses a sequential scan
for example for this simple query:
select max(timestamp) from readings;
Whis takes way too long, it takes many seconds. I would think indices
could speed this kind of simple queries tremendously.. I just don't
get postgresql to use them :(
Any suggestions?
My version of psql is 6.4.2.
rgds
Juuso Oikarinen http://www.students.tut.fi/~oikarine
Hiroshima '45 - Czernobyl '86 - Windows '95
