Space Usage 
Space Usage
Use
Database space is organized in several database files on disk.
In the SAP/SQL Server Database Monitor, the Space Usage section is divided into the following areas:
Total data size
The size of the R/3 database in MB.
Total log size
The size in MB of the logfiles for the R/3 database.
Free space
The free space is displayed in the R/3 database and its log files in MB.