A Dimecres 23 Juliol 2008, Miernik va escriure: > I have a PostgreSQL database on a very low-resource Xen virtual machine, > 48 MB RAM. When two queries run at the same time, it takes longer to > complete then if run in sequence. Is there perhaps a way to install > something like a query sequencer, which would process queries in a FIFO > manner, one at a time, even if a new query comes before the last one > running is finished, it would not give the new query to the server > before the one running now finishes? That would greatly improve > performance. You didn't mention your PostgreSQL version. Since 8.3 there's "synchronized scans" which greatly improves performance if concurrent queries have to do a sequential scan on the same table. Of course, if queries don't hit the same table there'll be no improvements in performance... > > Any tips in general for running PostgreSQL on such low-resource machine? > > I have: > > shared_buffers = 5MB > work_mem = 1024kB > > are these good values, or could perhaps changing something improve it a > bit? Any other parameters to look at? > > -- > Miernik > http://miernik.name/
