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The recycle bin is enabled by default.

To disable the recycle bin:

Issue one of the following statements:

ALTER SESSION SET recyclebin = OFF;

ALTER SYSTEM SET recyclebin = OFF;

To enable the recycle bin:

Issue one of the following statements:

ALTER SESSION SET recyclebin = ON;

ALTER SYSTEM SET recyclebin = ON;

Enabling and disabling the recycle bin with an ALTER SYSTEM or ALTER SESSION statement takes effect immediately. Disabling the recycle bin does not purge or otherwise affect objects already in the recycle bin.

Like any other initialization parameter, you can set the initial value of the recyclebin parameter in the text initialization file initSID.ora:

recyclebin=on