In a database management system, a tablespace is a logical storage unit that contains one or more database files. Tablespaces are used to organize and manage data, and they can be used to improve performance and manageability. Checking the size of a tablespace is important for ensuring that there is enough space to store data and for identifying any potential performance issues.
There are a number of ways to check the size of a tablespace. One way is to use the `sp_helpfile` system stored procedure. This procedure returns information about the size of a tablespace, as well as other information such as the number of files in the tablespace and the amount of free space available. Another way to check the size of a tablespace is to use the `dbcc spaceusage` command. This command returns information about the space usage of a database, including the size of each tablespace.