Re: Very long time to commit or close connections

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Chris Smith wrote:
| Hi everyone,
|
| I'm running into a rather serious problem in a production application
using
| PostgreSQL.
|
| We've got about a connection every 4 seconds being created to the
database.
| Most of the time, this causes no problems at all.  Occasionally,
though, with
| no apparent reason, the database will act up for some time (as little
as 10
| minutes, or as long as 45 minutes).  During that time, it accepts
connections
| and runs queries and statements with no problems, but hangs when
closing the
| connections.  After the time period expires, the database will wake up
and all
| connections that have been waiting will simultaneously return from the
JDBC
| Connection.close() method.
|
| Unfortunately, the problem is only occurring at a remote customer site to
| which we have limited access, and sometimes requires multiple days of
running
| time to reproduce.  As a result, it's hard to see what's happening at the
| instant this happens.  I'm trying to gather more information, but
don't have
| it right now.

Could this be related to a network problem ?

Like RST not received by the client, making it believe the server did
not acknowledge the connection.close(), eating up the server's resources
? No firewall/VPN gateways between you and your customer ?

I've seen this kind of behaviour in the past (with oracle), and tweaking
our firewall rules solved the case - just imagine how much time we've
spent before finding out :-(
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