In case of incremental backups, oracle takes the backup of only modified objects.
Note : The biggest dis-advantage is, even if a single record is modified, it considers the entire segment.
"inctype" is the parameter that we use to take the incremental backups. The possible options for inctype are :
1.complete
2.incremental
3.cumulative
inctype=complete/incremental/cumulative
inctype=complete is the base backup for incremental backups. It takes the backup of entire database and it also maintains some information in the data dictionary tables which is required for next incrementals.
inctype=incremental takes the backup of all modified objects till the last incremental or cumulative or complete whichever appears first.
inctype=cumulative takes the backup of all modified objects till the last cumulative or complete whichever appears first.
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