> You could query pg_stat_activity or the underlying statistics > collector functions. > > http://www.postgresql.org/docs/8.1/interactive/monitoring-stats.html > > Statistics collector reports lag behind actual activity but they > might suffice for whatever you're doing. Why does your application > need to know this? I want to licence my application per-connection basic. I can assume that Postgres 8.1 database or even a whole cluster is accessed only by my application or sometimes by pgAdmin for administration. pgAdmin creates 3 rows in pg_stat_activity table. My application uses only a single connection so it creates single row in pg_stat_activity table. So I have a parameter stored in a database called "maximum number of simultaneous connections". This determines how many users can simultaneously work with my application Is the query select count(distinct client_addr) from pg_stat_activity best way do obtain this parameter from Postgres 8.1 ? or should it be better to check only single database: select count(distinct client_addr) from pg_stat_activity where datname='mycurrentdatabase' Will those queries work with any postgres.conf and other postgres config settings and with any user access rights ? Andrus.
