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How to Delete A User In Oracle?

3 minutes read

To delete a user in Oracle, you can use the DROP USER statement followed by the username of the user you want to delete. Make sure that you have the necessary privileges to perform this operation, such as the DROP USER system privilege or membership in the DBA role. Additionally, ensure that you have backed up any important data associated with the user before deleting them. Once the user is deleted, their schema objects and data will also be removed from the database.


How to delete a user with the CASCADE CONSTRAINTS option in Oracle?

To delete a user with the CASCADE CONSTRAINTS option in Oracle, follow these steps:

  1. Log in to Oracle SQL*Plus or another SQL client as a user with the necessary permissions to delete users.
  2. Run the following SQL command to delete the user with the CASCADE CONSTRAINTS option: 
1

DROP USER username CASCADE;


Replace "username" with the name of the user you want to delete. The CASCADE keyword will remove all objects owned by the user, including tables, views, procedures, and constraints.

  1. Confirm that you want to delete the user and all associated objects by entering "Y" when prompted.
  2. Once the command has been executed successfully, the user and all associated objects will be deleted from the database.


Note: Be cautious when using the CASCADE CONSTRAINTS option as it will permanently remove all objects owned by the user. Make sure to back up any important data before deleting the user.


How to delete a user with the DEFAULT TABLESPACE option in Oracle?

To delete a user with the DEFAULT TABLESPACE option in Oracle, you can use the following steps:

  1. Login to your Oracle database using a user with the necessary privileges to delete users.
  2. Execute the following SQL statement to delete the user, specifying the DEFAULT TABLESPACE option:
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DROP USER username CASCADE DEFAULT TABLESPACE tablespace_name;


Replace username with the name of the user you want to delete and tablespace_name with the name of the default tablespace you want to assign to objects owned by this user after deletion. 3. Confirm the deletion by executing the SQL statement. The CASCADE option will delete all objects owned by the user, and the DEFAULT TABLESPACE option will assign the specified default tablespace to objects owned by this user after deletion.


Please note that this operation cannot be undone, so make sure to double-check your input before executing the statement.


How to delete a user with the RESTRICT option in Oracle?

To delete a user with the RESTRICT option in Oracle, follow these steps:

  1. Log in to the Oracle database with a user account that has the necessary privileges to delete users.
  2. Run the following SQL command to delete the user with the RESTRICT option:
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DROP USER <username> CASCADE;


Replace <username> with the name of the user you want to delete. The CASCADE option will delete all objects (tables, views, procedures, etc.) owned by the user.

  1. If you want to prevent dropping the user if it owns any objects, you can use the RESTRICT option instead:
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DROP USER <username> RESTRICT;


This will prevent the user from being dropped if they own any objects. A message will be displayed indicating which objects need to be dropped before the user can be deleted.

  1. After running the SQL command, the user will be deleted from the database with the specified restrictions.
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