About Nodata Storage Checkpoint and NetBackup for SAP
The Nodata Storage Checkpoint sets a bit to indicate if a file block changed. When you use Nodata Storage Checkpoints, the data files are left in backup mode for the duration of the backup. The amount of redo logs generated depends on the number of changes that were made during the backup.
To support BLI backup, the VxFS file systems need extra disk space to keep track of the block change information. The space that is required depends on the database workload while the backup is running. For Nodata Storage Checkpoints, the additional space requirement by each file system is about 1% of the file system size.
Note:
The default option that NetBackup uses for backups is Fulldata Storage Checkpoint. With this option, the NetBackup for SAP keeps the Oracle data files in backup mode only for the time that is needed to create a Storage Checkpoint.