def verify(self):
        """
            :desc: Verifies the integrity of the database, specifically checks
                   the values for unusedIDs and currentMax
            :returns: A boolean indicating whether the database is valid or
                      not
            :rval: bool
        """
        collections = self.get_data_collections()

        allIDs = []
        for coll in collections:
            IDs = self.noteDB[coll].find({"ID": {"$exists": True}},
                                         {"ID": 1, "_id": 0})
            for ID in IDs:
                allIDs.append(int(ID["ID"]))

        query = {"currentMax": {"$exists": True}}
        maxID = int(self.noteDB['IDs'].find_one(query)["currentMax"])
        query = {"unusedIDs": {"$exists": True}}
        unusedIDs = self.noteDB['IDs'].find_one(query)["unusedIDs"]
        unusedIDs = [int(ii) for ii in unusedIDs]

        unusedIDsMatch = True
        for ID in allIDs:
            if ID in unusedIDs:
                unusedIDsMatch = False

        maxIDMatch = True
        if maxID is not max(allIDs):
            maxIDMatch = False

        if maxIDMatch and unusedIDsMatch:
            print "Database is valid"
        elif not maxIDMatch and not unusedIDsMatch:
            print "Database not valid, max ID and unused IDs are incorrent"
        elif not maxIDMatch:
            print "Database not valid, max ID is incorrent"
        elif not unusedIDsMatch:
            print "Database not valid, unusedIDs is incorrent"