A comment to the paragraph below was recently added via 
http://www.zope.org/Documentation/Books/ZopeBook/2_6Edition/RelationalDatabases.stx#2-7

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    Zope can connect to all the above-listed database systems; however,
    you should be satisfied that the database is running and operating
    in a satisfactory way on its own before attempting to connect it to
    Zope.  An exception to this policy is Gadfly, which is included with
    Zope and requires no setup.

      % Anonymous User - Mar. 25, 2004 6:57 am:
       It seems Gadfly isn't thread safe. I learned this the hard way when 
using it to count page views on a
       2-processor machine. This caused regular crashes when two requests came 
in simultaneously and tried to modify
       the database, resulting in Zope getting stuck in a state that required 
manual intervention (kill -9) to bring
       it up again.
       Too bad, because it's nice to be able to rely on a database that always 
comes with Zope.

      % Anonymous User - Oct. 21, 2005 10:25 am:
       How about switching to SQLite instead? 

       www.sqlite.org 

       There are a python adaptors which work nicley with zope.
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