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How to check whether standby is doing recovery? 

SQL> SELECT * FROM (
  2    SELECT sequence#, archived, applied,
  3           TO_CHAR(completion_time, 'RRRR/MM/DD HH24:MI') AS completed
  4     FROM sys.v$archived_log
  5     ORDER BY sequence# DESC)
  6  WHERE ROWNUM <= 10
  7  /

 SEQUENCE# ARCHIVED APPLIED COMPLETED
---------- -------- ------- ----------------
     11211 YES      NO      2004/09/16 09:30
     11210 YES      YES     2004/09/16 09:00
     11209 YES      YES     2004/09/16 08:30
     11208 YES      YES     2004/09/16 08:00
     11207 YES      YES     2004/09/16 07:30
     11206 YES      YES     2004/09/16 07:00
     11205 YES      YES     2004/09/16 06:30
     11204 YES      YES     2004/09/16 06:30
     11203 YES      YES     2004/09/16 06:30
     11202 YES      YES     2004/09/16 06:00

10 rows selected.
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