ZODB.Architecture.Connection.sync

Documentation
Synchronize the connection with saved data. Any pending changes on the connection and any other conection are aborted.

This method is useful in long-running interactive sessions to see the effects of other sessions.
Sample

You can establish a database connection using the ZServer monitor client to query the value of persistent ojects withot shutting down the Zope process:

import Zope
app=Zope.app()

... Time goes by and changes are made

app._p_jar.sync()