def __estimate_dumpsize(self):
"""
Makes a guess on the dump size using internal database metrics
:return: A value in bytes, or None (unknown)
"""
statement = query_factory.get_dumpsize_estimate(self.db_name)
process_output = self.__runner.get_single_result(statement)
try:
return int(process_output) * self.__DUMPSIZE_ESTIMATE_INFLATION
except ValueError:
# Value unparsable, likely NULL
return None
def test_get_dumpsize_estimate():
assert (
query_factory.get_dumpsize_estimate(
"test") == "SELECT data_bytes FROM "
"(SELECT SUM(data_length) AS data_bytes "
"FROM information_schema.tables WHERE table_schema = 'test') AS data;")