Luki Rustianto wrote: > Ok I see. So what's the best way to find optimum value for > various memory-related setting of postgresql ? How much memory is there in the machine? Are there other programs running or is the machine dedicated to the database? Are the queries you run complicated (order / hash large amounts of data) or simple? Maybe a rough guideline would be: Set work_mem to the amount of memory a query will regularly need for sorting and such, set max_connections to the maximum number of connections you need. Then figure out how much memory you want to dedicate to the database, subtract work_mem * max_connections from that value and set shared_buffers to the result value. Make sure you adjust the kernel parameters accordingly, see http://www.postgresql.org/docs/current/static/kernel-resources.html Tom Lane suggested in http://archives.postgresql.org/pgsql-general/2004-02/msg00471.php that it might be better to set shared_buffers "relatively small" and let the filesystem cache do the buffering, so that's another way you can go. His advice is usually good. Yours, Laurenz Albe -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
