--- In firebird-support@yahoogroups.com, Kalman Szalai <szalaik@i...>
wrote:

> Originally our program use only one connection,

In this case threads must heavily syncronize their usage of connection.

> but one of my collegue
> wrote an application (only for testing) with using separate connection
> for each thread.
> So we tried all of two way but it stopped to work...

Do you connect via TCP/IP? Local connection serializes calls in
client so if one thread started to execute query and waits result,
another threads waits too. If you can make simply reproducable test
case for TCP/IP connections and connection per thread, I recommend
report and discuss it in firebird-devel list.

Best regards,
Alexander.