> We have Pg 8.0.x and Pg 8.2.x on 2 separate Linux servers. We have a perl > script (perl 5.8.7, DBI-1.48/DBD::Pg-1.49) that connects to each > database to > determine if there are active connections.with the following query. > SELECT count(*) from pg_stat_activity; > > The above query always returns 0 rows for Pg 8.0.x and 1 row for Pg 8.2.x. > > When we connect to the database using psql client, the above query > returns 1 > row for both the databases.
The pg_stat_activity view is never completely up-to-date, there is always some time lag. This means whether you see your own connection will depend on the precise order of events. Try sleep()ing for a second before issuing the query and see if that makes it go away. If so, it's just timing problems.
I've seen similar with "ps auxw | grep foo" from the command-line.
Thanks! sleep 1; works like a charm on both the databases.
