dropuser removes an existing PostgreSQL user. Only superusers and users with the CREATEROLE privilege can remove PostgreSQL users. (To remove a superuser, you must yourself be a superuser.) dropuser is a wrapper around the SQL command DROP ROLE.

postgres user account One reason for this is security: The database’s data files and security configuration files are stored in folders owned by the postgres user. So if your main user account is hijacked, the intruder does not yet have access to the database (often the most valuable thing in storage).

To uninstall PostgreSQL on a Mac system, assume the identity of an operating system superuser, and navigate into the folder in which the uninstaller resides:

1. /Library/PostgreSQL/11.
2. open uninstall-postgres.app.
3. Figure 5.6 – Remove the entire application or components.
4. Figure 5.7 – Selecting the components to uninstall.

Choose Terminal from the Utilities menu –> Terminal should appear. Enter: resetpassword at the prompt and hit return –> a new window/app should appear behind the Terminal window called “Reset Password” Go to Users & Groups System Preferences pane, select the account you’re trying to delete and hit the minus button.

To change username:

1. ALTER USER user_name RENAME TO new_name.
2. ALTER USER user_name WITH PASSWORD ‘strongpassword’;
3. local all all peer.
4. local all all md5.

The user is created by postgresql on which one of your programs depend. Its no problem that you have an extra user on your machine, in fact you’ll have several such users for various purposes on your computer. These users generally dont have a password because usually no one interactively logs into the user account.

To uninstall PostgreSQL, navigate to the Windows Control Panel to open the Uninstall or change a program dialog and Right-click the PostgreSQL 13 and select Uninstall/Change from the context menu. You can either remove the entire application or individual components.

Remove all the files and folders listed using rm command. Delete the user postgres using the command : userdel -f postgres.

All you have to do is:

1. Stop the postgres version you want to delete / uninstall.
2. Delete the ‘bin’ and ‘data’ directories of the postgres version you just stopped.
3. If you are using tablespaces, delete the contents of your tablespace location as well.

Remove a Linux user

1. Log in to your server via SSH.
2. Switch to the root user: sudo su –
3. Use the userdel command to remove the old user: userdel user’s username.
4. Optional: You can also delete that user’s home directory and mail spool by using the -r flag with the command: userdel -r user’s username.

Delete a user or group on Mac

1. On your Mac, choose Apple menu > System Preferences, then click Users & Groups . Open Users & Groups preferences for me.
2. Select the user or group you want to delete, then click the Remove button (looks like a minus sign) below the list of users.
3. Do one of the following:
4. Click Delete User.

When you’re administering a CockroachDB database cluster, you may find yourself needing to drop a particular user from the cluster. It’s easy to remove a CockroachDB user with the DROP USER command. In this article, we’ll take a closer look at the Postgres DROP USER command and check out some examples of its use.

You can drop more than one user at a time, by provided the user names separated by comma. Consider a PostgreSQL where there are two users as shown in the following. In this example, we are going to drop user lini. To delete the user, we run the following command. The user is successfully deleted from PostgreSQL database.

In PostgreSQL, the user called postgres has full superuser privileges and thus can access everything that resides in your PostgreSQL installation. The following command will let you enter the psql command-line interface as the postgres superuser: Once you’re connected to psql, you’ll be able to create a user with the WITH LOGIN attribute.

A Postgres “role” is very similar to a Postgres “user”, but a key distinction exists. While a role can be either a group or a user, roles that have login privileges are defined as “users”. To drop a Postgres ROLE, just use the DROP command syntax in the same way that you would to delete a user: