Thread:Project:Support desk/Permanent deletion?/reply (10)

Every RDBMS I know, when you delete rows from a table, doesn't deallocate that unused space so it's free for the underlying operating system to reuse it. Basically, if your datafiles are 8GB and you delete 4GB of data from the database, the datafiles will still be 8GB in size. That space can be reused by the database.

Maybe that's what 218.186 is referring to, since the OP is concerned about space usage.