When this problem occurs, the hard-disk is usable as I can still copy files, move files, delete files etc. so I don't believe that it is an I/O issue. We are not currently tracking any I/O performance metrics.

We do use UDFs, but they should not be affecting all connections. The strange thing is that the problem occurs about once a month.

Nothing is logged in firebird.log.

I'm guessing that there is some kind of issue in Super-Classic where it is doing some kind of internal process that blocks all database operations for a period of time. This problem was observed with both Firebird S.C. x64 2.5.0 and 2.5.1.

Regards,

Anthony

--- In firebird-support@yahoogroups.com, Dmitry Kuzmenko <kdv@...> wrote:
> Looks like storage hangs. Have you looked at
> - windows system log
> - Perfmon, at the physical disk counters (queue, disk read bytes/sec,
> disk writes bytes/sec)
> ?
>
> and, anything in firebird.log?
> do you use any UDFs?
>
> --
> Dmitry Kuzmenko, www.ib-aid.com
>