How to remove users and data in Oracle?

2 years ago
Isabella Edwards
2 minutes

To delete a user and their data from an Oracle database, follow these steps:

  1. Log in to the Oracle database as a user with administrator privileges.
  2. Check if the user has a session or connection to the database. You can verify this by using the following query statement:
  3. Retrieve the sid, serial number, username, osuser, and machine columns from the v$session table where the username is the one to be deleted.
  4. If the query results are not empty, it is necessary to terminate the user’s session or connection. You can use the following statement to end the session:
  5. Terminate a session using ‘sid,serial#’.
  6. The ‘sid’ and ‘serial#’ are the values of ‘SID’ and ‘SERIAL#’ from the previous query result.
  7. Revoke the user’s access privileges to the database. You can use the following statement to revoke the permission:
  8. Remove the CONNECT and RESOURCE privileges from the username.
  9. The “username” refers to the name of the user to be deleted.
  10. Remove all objects belonging to a user (tables, views, indexes, etc.). You can use the following statement to delete all objects:
  11. Delete the tablespace, including all its contents and datafiles.
  12. The ‘tablespace name’ is the name of the tablespace of the user to be deleted.
  13. Lastly, delete the user themselves. You can use the following statement to delete the user:
  14. Delete the user with the given username and all associated objects.
  15. The ‘username’ is the name of the user to be deleted.

Please note that deleting a user and their data is an irreversible operation, so please proceed with caution and make sure to back up important data.

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