You can turn on or off the recycle bin feature for an instance in the instance parameter file with "recyclebin=on/off". You can also turn on or off the recycle bin feature on the running instance with a SQL*Plus command, if you log in as SYSTEM. See the following example:

SQL> connect SYSTEM/globalguideline

Connected.

SQL> SHOW PARAMETERS RECYCLEBIN

NAME      TYPE  VALUE

------------------------------------ ----------- -------

recyclebin     string on

SQL> ALTER SYSTEM SET RECYCLEBIN = OFF;

System altered.

SQL> SHOW PARAMETERS RECYCLEBIN

NAME      TYPE  VALUE

------------------------------------ ----------- -------

recyclebin     string OFF

Warning: Turning off the recycle bin feature will give your users hard times on recovering dropped tables.