Hi everybody... I'm new hear, and I will try to explain my problem, and maybe I can get a help...
I'm writing a software for 3 years, and this software has the position GPS from vehicles, and other informations. My problem starts when I had to store all the data about the vehicles, about 1 or 2 months. Actually I had a table called DADO_LIDO, that I write all information and the primary key is DATA (GPS DAY+HOUR) and the VEHICLE IDENTIFY. Each vehicle trasmit 1 position by 30 seconds, so I have something like 2000 rows per vehicle/day. I already has 2 clients one with 4000 vehicles, and the other with 500 vehicles. My application was made in delphi using ZEOS that's permit me testing in mysql and postgres. I allready has the two databases. But now the problem starts when I has to select data from this vehicles about the history ( I store only 2 months ) something like 40 or 50 millions of data about 500 vehicles. Using the keys VEHICLE_ID and GPS_TIME, the perfomance is very low... I need some ideas for a better perfomance in this table using selects by PERIOD / VEHICLE PERIOD / VEHICLES PERIOD / VEHICLE / ( a bit test in 3 integer columns using logical operators ) Thanks for any help Vinicius Marques De Bernardi ---------------------------(end of broadcast)--------------------------- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq