In database management, tablespaces are logical storage units that hold data. They are used to organize and manage data, and to improve performance by separating data into different physical locations. Free tablespace is the amount of space that is available in a tablespace for storing data. Checking free tablespace is important to ensure that there is enough space to store new data, and to avoid performance problems.
There are several ways to check free tablespace. One way is to use the `SHOW TABLESPACES` command. This command will display a list of all tablespaces in the database, along with their current size and free space. Another way to check free tablespace is to use the `DBA_TABLESPACES` view. This view contains information about all tablespaces in the database, including their current size and free space.