This is very interesting to hear... I am just about to connect a MySQL database to Zope 2.0.0a3 using ZMySQLDA. I understand the problem, but how do I make sure Zope is running single-threaded? As I understand ZServer runs multithreaded (provided Python is compiled --with-threads) and ZopeHTTPServer runs on a single thread.

Actually ZServer requires threads, it uses one thread for Zope and one for the server... but this would be considered "single threaded" from a DA perspective (see the document I'm going to send out this afternoon to the list summarizing a lot of DA issues).

Question: Can I tell ZServer to run with a single thread, and if yes, how so? Or do I have to use ZopeHTTPServer if I want single thread?

You just need to run ZServer with the '-t 1' or '-t1' option,, which says to only use 1 thread max. Chris -- | Christopher Petrilli Python Powered Digital Creations, Inc. | petrilli@digicool.com http://www.digicool.com