A very simple tool to report the size of objects in a storage.

src/scripts/space.py

+#! /usr/bin/env python
+
+"""Report on the space used by objects in a storage.
+
+usage: space.py data.fs
+
+The current implementation only supports FileStorage.
+
+Current limitations / simplifications: Ignores revisions and versions.
+"""
+
+import ZODB
+from ZODB.FileStorage import FileStorage
+from ZODB.utils import U64
+from ZODB.fsdump import get_pickle_metadata
+
+def main(path):
+    fs = FileStorage(path, read_only=1)
+    # break into the file implementation
+    if hasattr(fs._index, 'iterkeys'):
+        iter = fs._index.iterkeys()
+    else:
+        iter = fs._index.keys()
+    for oid in iter:
+        data, serialno = fs.load(oid, '')
+        mod, klass = get_pickle_metadata(data)
+        print "%8s %5d %s.%s" % (U64(oid), len(data), mod, klass)
+
+if __name__ == "__main__":
+    import sys
+    try:
+        path, = sys.argv[1:]
+    except ValueError:
+        print __doc__
+        sys.exit(2)
+    main(path)