* not to compress BTree Nodes and Keys.
*/
DB db2 = DBMaker.newMemoryDB().make(); //no store wide compression this time
//construct value serializier, use default serializier
Serializer valueSerializer = db2.getDefaultSerializer();
//but wrap it, to compress its output
valueSerializer = new Serializer.CompressionWrapper(valueSerializer);
//now construct map, with additional options
Map map2 = db2.createTreeMap("test")