At now I have this system runing in a mysql, all the examples I have
are in mysql, but the biggest client that will start now, we will use
PostgreSQL, so I need a way to do those questions in postgres...
Ideas like TABLESPACES or anothe things...
Just looking for start ideas...
Vinicius Marques De Bernardi
On Tue, 29 Mar 2005 12:08:15 -0700, Michael Fuhr <[EMAIL PROTECTED]> wrote:
> On Tue, Mar 29, 2005 at 03:33:24PM -0300, Vinicius Bernardi wrote:
> > 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...
> Please post an example query and the EXPLAIN ANALYZE output. The
> table definition might be useful too.
> > I need some ideas for a better perfomance in this table
> Do you have indexes where you need them? Do you cluster on any of
> the indexes? Do you VACUUM and ANALYZE the database regularly?
> Have you investigated whether you need to increase the statistics
> on any columns? Have you tuned postgresql.conf? What version of
> PostgreSQL are you using?
> Michael Fuhr
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match