warm-standby errors

Hello,
    We have a warm-standby of one of our databases, and by this I mean a
server in constant recovery mode applying logs being shipped from a
primary to the warm-standby. Recently we had to bounce the standby
instance and I saw this error in our logs:

2009-04-27 07:11:21.213 GMT,,,,8261,,,1, //  LOG:  database system was
interrupted while in recovery at log time 2009-04-27 06:55:08 GMT
2009-04-27 07:11:21.213 GMT,,,,8261,,,2, //  HINT:  If this has occurred
more than once some data may be corrupted and you may need to choose an
earlier recovery target.
2009-04-27 07:11:21.213 GMT,,,,8261,,,3, //  LOG:  starting archive recovery

the log message did not appear again until the instance was bounced
again. Short of copying the data files elsewhere and doing a row-level
comparison of the data, is there any way I can check to see if there is
actual corruption in the warm standby server? How can I prevent this
error from occurring ?

  Thanks,
   -Said