Simplifying PostgreSQL User Management: Two Methods

Managing database users is a core task for any administrator. PostgreSQL offers two straightforward methods to list users: via the psql terminal and by querying the database. This guide walks you through both approaches.

Listing users in PostgreSQL

Use the psql command

The psql terminal lets you directly manage and query your database.

Connect to PostgreSQL

Use this command to log in.

psql -U <username>

Run the Command

Enter this command for a list of users.

\du

Or this for detailed output:

\du+

Query the database

For structured information, query the pg_user view.

Run the Query

SELECT * 
FROM pg_catalog.pg_user;

Interpret the Results

This shows user details, including permissions and roles.

FAQ

How do I display superusers only?

Run this query

SELECT * 
FROM pg_catalog.pg_user 
WHERE usesuper = true;

Can I see logged-in users?

Yes, query pg_stat_activity

SELECT * 
FROM pg_catalog.pg_stat_activity 
WHERE state = 'active';

Why is authentication necessary?

It ensures security by restricting access to sensitive data and preventing unauthorized users from listing database users.

Which tools can simplify this process?

DbVisualizer offers a visual interface for managing queries and inspecting user details more easily.

Conclusion

PostgreSQL makes listing users simple with psql commands or SQL queries. Use these methods to maintain database security and organization. For more, visit the article Postgres List Users: Two Different Approaches.