The alter table command supports the ability to remove residual data from deletions in SAP ASE.
alter table table_name set "erase residual data" {on | off}
When you set this option on a table, the operations for the table (drop table, delete row, alter table, drop index) that result in residual data automatically clean up deallocated space. The default is set to off.
Only the table owner or a user with alter any table permission can use the "erase residual data" option.