How to upgrade a User to Superuser in PostgreSQL
In PostgreSQL, a superuser has unrestricted access to all database functions, including administrative tasks and user management. If you need to grant a specific user superuser privileges, you can do so with the ALTER USER command. However, only an existing superuser can promote another user to superuser status.
Syntax to upgrade a user to Superuser
The command to make an existing PostgreSQL user a superuser is:
ALTER USER username WITH SUPERUSER;
Explanation:
Example Code:
Suppose you have a user named zkmd_meoh and want to upgrade this user to superuser status.
-- Grant superuser privileges to zkmd_meoh
ALTER USER zkmd_meoh WITH SUPERUSER; -- Elevates zkmd_meoh to a superuser
Explanation:
Additional Tips and Cautions
ALTER USER username WITH NOSUPERUSER;
Example:
ALTER USER zkmd_meoh WITH NOSUPERUSER;
Use Caution: Superuser access is powerful and grants unrestricted access to all databases and settings. Assign superuser status sparingly to maintain security and control.
Checking User Privileges
To verify a user’s privileges, including whether they are a superuser, use this query:
SELECT usename, usesuper FROM pg_catalog.pg_user WHERE usename = 'username';
Example:
Following query will return true in the usesuper column if zkmd_meoh is a superuser.
-- Check if zkmd_meoh is a superuser
SELECT usename, usesuper FROM pg_catalog.pg_user WHERE usename = 'zkmd_meoh';
Important Notes:
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