Stephan Herschel writes:

We've got a db2 database which we access with zope. It seems that the Zope-server is regularly opening new connections but never closing them. I've already looked into the database-adapter, but to me it looks ok. Maybe somebody can explain to me how Zope works in this respect or tell me where I can find documentation? When is Zope supposed to open a new connection? When will it close an open connection? What classes are involved? Zope flushes objects from its cache when they are not used for some time (can be controlled via "Control_Panel --> Database Management --> Cache parameters"). When it flushes a database connection object, the connection should be closed.

When the object is later needed again, it is read from the storage and a new connection is created to the database. This means, something prevents closing the connection when the object is flushed. Dieter