Re: logging or debugging to report time to establish a database connection

On Jul 12, 2013, at 9:00 AM, Mike Broers wrote:

> Is there something I am overlooking in postgres logging or psql client switches that would make this information available or am I stuck with lower level tools?

Well, if you want to log how long pgbouncer takes to hand out a connection from a pool, you're certainly not going to find that answer anywhere in postgresql logging ;-)

Unfortunately, it doesn't look to me as though the pgbouncer console will show you exactly that. Maybe using -v or -vv options would help? But yes, average/max/min maybe even stddev of time to hand out a connection would seem to be information that would be good to collect, so perhaps a feature request is in order...

Of course there will also be overhead in the libraries that will vary from one database manager to another, so in my opinion the only way to really benchmark this would be from the client side anyway. Which is maybe what you were thinking when asking about psql switches? Again, a feature request might be in order--I can think of two possibilities: 1) a command-line verbose-mode switch that would provide details of the connection process, which could be good also for debugging connection problems, showing what host is being attempted, what the resolution (if any) of the host name is, connection opened or not, authentication passed or not, and so on; 2) enhancements to the /conninfo command to provide more details.

--
Scott Ribe
scott_ribe(at)elevated-dev(dot)com
http://www.elevated-dev.com/
(303) 722-0567 voice