Hrasky Petr writes:

thank you for answers. To clarify: I run Zope-2.2.2/Linux2.2.14/MySQL-ZMySQLDA1.1.3nonbin at home and Zope-2.2.2-binary/NT4.0Workstation/ZODBCDA3.1.0b2 (Oracle 8i ODBC, Sybase11.5)at work. Oracle connection at work and MySQL (at home just for testing) run looong queries and halt Zope. I have no such queries for Sybase yet. I will try to recompile python for linux, but I can't do so for WinNT as I have no compiler. Anyway I thought the python distributed with binary release of Zope is threaded, no? If Python is compiled without threads, there is no module "thread". Zope relies on this module. It dies immediately, if it is not there. Thus, you can be sure, your Python has thread support compiled in.

So, does anybody know of either binary and threaded Zope driver for Oracle , Sybase etc. or the same ODBC driver? And what is the state of python threading on WinNT paltform? The Python that comes with Zope has thread support compiled in.

Maybe, your Python-ODBC connection "forgets" to release Python's interpreter lock. We, once, had such a problem. Accidentally, the DCOracle module had been set up with a standard Python distribution (with threading disabled) rather than the Zope Python. As a consequence, the DCOracle did not call "releaseLock" and "acquireLock" (as they would not be present in a non-threaded Python). And, of course, database operations blocked Zope. Dieter