@{$db{'key1'}{'key2'}[0][0]} = "one_value";
@{$db{'key1'}{'key2'}[0][1]} = "two_value";
@{$db{'key1'}{'key2'}[1][0]} = "three_value";
@{$db{'key1'}{'key2'}[1][1]} = "four_value";
@{$db{'key1'}{'key2'}[2][0]} = "three_value";
@{$db{'key1'}{'key2'}[2][1]} = "four_value";