Database backup scenarios involve the following concepts: database disk space, data file size, backup data size, and storage data size.
|Database disk space||The total disk space of a database consists of the available space of the operating
system of the server where the database resides and the total space consumed by data
files, logs, and operating system files.
|Data file size||The data file size of a database is equal to the amount of disk space occupied by
database data files on the server where the database resides.
You can perform the following operations to view the data file size of a database:
|Backup data size||The backup data size of a database refers to the amount of data that you back up by using DBS. The backup data size is based on various factors, such as the database type, backup mode, and backup granularity.|
|Storage data size||The storage data size of a database refers to the amount of data stored in the storage system. The storage data size is based on a variety of factors such as the backup data size, the storage format of backup data, and the compression algorithm.|
The database disk space is greater than the data file size. The data file size is greater than the backup data size. The backup data size is greater than the storage data size.