1)Make a backup of the tablespace you are going to drop
2)
SQL>alter tablespace TABLESPACENAME offline;
SQL>drop tablespace TABLESPACENAME including contents;
3) then drop the datafile associated with the TABLESPACE in your system.
If you are not using 8i, you will not be able to take tablespace space backup, and only way is to backup all the users using that tablespace and then drop it.
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