Some of the disadvantages of using RMAN are:

·         If the location of the backup set is changed, it is required to register it using RMAN; otherwise it would result in hanging situations when trying to restore backup.

·         There is no relevant method to know whether during recovery, database restore is going to fail because of missing archive log file.

·         If tape backup is used, media management is compulsory.

·         Incremental backups though used to consume less space, are often slower as they use to read the whole database to find the changed blocks.