Re: High-water Mark for number of sessions/connections reached in Postgres

On Fri, Aug 6, 2010 at 6:19 PM, Tomeh, Husam <HTomeh(at)corelogic(dot)com> wrote:
> I was wondering if we can query/obtain the high-water mark of number of sessions or connections reached in a Postgres database. Is there a view or command that can provide this information.  The pg_stat_database shows the current number of connections, but not the high-water mark a database had reached.

It's a pretty easy thing to approximate with a shell script.

while true;do ps ax|grep postgres:|grep -v grep|wc -l ;sleep 10;done >
connects.log &

then just tail the connects.log file. It's a dirty hack and it'll be
a few counts over due to counting the postmaster and a few other
processes, but it'll give you a good idea of what your system is
doing. Add a date in there if you need to know the time it was
happening.