Is standby up to date

Question

Hi,
on 10g R2,
how to know if standby is up to date ?
I use the following on Primary :
SQL>  select CHECKPOINT_CHANGE# from v$database;
CHECKPOINT_CHANGE#
        9,7194E+12 And on standby :
SQL> select CHECKPOINT_CHANGE# from v$database;
CHECKPOINT_CHANGE#
        7,8768E+12 Is it a right method ? If not how to verify ?
Thank you.
PS :
On standby I have :
SQL> select THREAD#,SEQUENCE#,to_char(completion_time,'DD-MM-YYYY HH24:MI:SS' ),applied from v$archived_log ;
no row selected I'm astonished.

Answer 1

Nicolay :
on primary :
SQL> show parameter DG_
NAME                                 TYPE        VALUE
dg_broker_config_file1               string      ?/dbs/[email protected]
dg_broker_config_file2               string      ?/dbs/[email protected]
dg_broker_start                      boolean     FALSE
SQL> select name, DATABASE_ROLE from v$database;
NAME      DATABASE_ROLE
MYDB      PRIMARY
On standby :
SQL> select name, DATABASE_ROLE from v$database;
NAME      DATABASE_ROLE
MYDB      PHYSICAL STANDBYRegards.