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

If you want a date stamp, you can change the ps ax stuff to look like this:

date +"%Y-%m-%d %H:%M:%S"|tr "\n" ":";ps ax|grep postgres:|grep -v grep|wc -l

On Mon, Aug 9, 2010 at 4:21 PM, Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> wrote:
> 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.
>

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