A number of ZODB gimmicks were officially deprecated in ZODB 3.4, and
removed in ZODB 3.6.  Zope 2.9 uses the latter.  From the ZODB NEWS
file for 3.6:

"""
Removal of Features Deprecated in ZODB 3.4
------------------------------------------

(3.6b2) ZODB 3.6 no longer contains features officially deprecated in the
ZODB 3.4 release.  These include:

- ``get_transaction()``.  Use ``transaction.get()`` instead.
  ``transaction.commit()`` is a shortcut spelling of
  ``transaction.get().commit()``, and ``transaction.abort()``
  of ``transaction.get().abort()``.  Note that importing ZODB no longer
  installs ``get_transaction`` as a name in Python's ``__builtin__``
  module either.

- The ``begin()`` method of ``Transaction`` objects.  Use the ``begin()``
  method of a transaction manager instead.  ``transaction.begin()`` is
  a shortcut spelling to call the default transaction manager's ``begin()``
  method.

- The ``dt`` argument to ``Connection.cacheMinimize()``.

- The ``Connection.cacheFullSweep()`` method.  Use ``cacheMinimize()``
  instead.

- The ``Connection.getTransaction()`` method.  Pass a transaction manager
  to ``DB.open()`` instead.

- The ``Connection.getLocalTransaction()`` method.  Pass a transaction
  manager to ``DB.open()`` instead.

- The ``cache_deactivate_after`` and ``version_cache_deactivate_after``
  arguments to the ``DB`` constructor.

- The ``temporary``, ``force``, and ``waitflag`` arguments
  to ``DB.open()``.  ``DB.open()`` no longer blocks (there's no longer
  a fixed limit on the number of open connections).

- The ``transaction`` and ``txn_mgr``arguments to ``DB.open()``.  Use
  the ``transaction_manager`` argument instead.

- The ``getCacheDeactivateAfter``, ``setCacheDeactivateAfter``,
  ``getVersionCacheDeactivateAfter`` and ``setVersionCacheDeactivateAfter``
  methods of ``DB``.
"""
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