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diff --git a/git/db/complex.py b/git/db/complex.py
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+"""Module with many useful complex databases with different useful combinations of primary implementations"""
+
+from py.complex import PurePartialGitDB
+from cmd.complex import CmdPartialGitDB
+from compat import RepoCompatibilityInterface
+
+__all__ = ['CmdGitDB', 'PureGitDB', 'CmdCompatibilityGitDB', 'PureCompatibilityGitDB']
+
+class CmdGitDB(CmdPartialGitDB, PurePartialGitDB):
+	"""A database which uses primarily the git command implementation, but falls back
+	to pure python where it is more feasible
+	:note: To assure consistent behaviour across implementations, when calling the 
+		``stream()`` method a cache is created. This makes this implementation a bad
+		choice when reading big files as these are streamed from memory in all cases."""
+
+class CmdCompatibilityGitDB(RepoCompatibilityInterface, CmdGitDB):
+	"""A database which fills in its missing implementation using the pure python 
+	implementation"""
+	pass
+
+class PureGitDB(PurePartialGitDB, CmdPartialGitDB):
+	"""A repository which uses the pure implementation primarily, but falls back
+	on using the git command for high-level functionality"""
+
+class PureCompatibilityGitDB(RepoCompatibilityInterface, PureGitDB):
+	"""Repository which uses the pure implementation primarily, but falls back
+	to the git command implementation. Please note that the CmdGitDB does it
+	the opposite way around."""