1). Connect to rman in nocatalog mode to check the datafile:
$ rman target /
RMAN> run {
allocate channel d1 type disk;
backup check logical validate datafile ;
release channel d1;
}
2). Or check all datafiles:
run {
allocate channel d1 type disk;
backup check logical validate database;
release channel d1;
}
3). Run following command to check if there is corruption information:
SQL> select * from V$DATABASE_BLOCK_CORRUPTION;
4). Check alert log if there is corruption information.
