Helen,
downloaded and installed the Firebird 1.5.3 nptl version. In
production environment after a couple of days the database engine hang
and the only solution seems restarting the server. After this the
problem disappear for about other 2 days, then you've to restart
again. The applications that work on the database seems suddenly
unable to attach to the database. The database will be unreachable up
to the server restart. This happens only on RedHat ES4 machines, on
similar machines running RedHat 9 and Firebird 1.5.1 we never
experienced such trouble. The applications working on database
performs very easy tasks, so it seems really a compatibility issue
with the RedHat ES4 OS or the underlying (IBM 346 Server-Xeon single
processor) hardware.

Any suggestion ?

Thank you

Alessandro

--- In firebird-support@yahoogroups.com, Helen Borrie <helebor@...> wrote:
>
> At 09:57 PM 8/02/2006, you wrote:
> >Hi to all,
> > recently we moved our FirebirdSS 1.5.1 server from RedHat 9b to
> >RedHat ES4. After this OS upgrade i've started experiencing some
> >trouble in attaching to database
> >Sometimes happens that i loose the possibility to attach to the main
> >database running on this server. Restarting the machine it seems that
> >the problem disappear. We never experienced such problem on the
> >previous OS. The only DDL task that the application accessing the db
> >does, is to create/drop dinamically some very simple computed fields
> >in a couple of tables. But this not happens very often.
> >Do you know if there is some compatibility trouble betweeen this
> >version of FirebirdSS and RedHat ES4?
>
> Yes, it's a threading incompatibility between Fb 1.5.1 and the New
> POSIX Threading Library (NPTL). You need the NPTL build (not
> available for Fb 1.5.1). Download the latest release (1.5.3) and
> make sure it's the NPTL build you get.
>
> ./heLen
>