>> Are you use x64 version of Windows and Firebird ?
>
> yes, i forget to say, i use windows 2008 64 bit

What about Firebird ?

>> > i also notice that the .lck file grow to 80 MB ! is it normal ? (averag=
> e 30 Mo)
>>=20
>> Too much i'd said...
>
> but what to do in this way ?

Show us a "fb_lock_print -h" and "gstat -h" output. Also look at average and
maximum value of "VM size" parameter of fb_inet_server processes.

Regards,
Vlad