Simplified Methods to List PostgreSQL Users

Managing PostgreSQL users involves listing them efficiently. This guide details simplified methods using command-line tools and SQL queries.

Listing Users via Command-Line (psql)

psql facilitates direct database interaction. Follow these instructions:

Open your terminal and connect with:

psql -U <username>

List users with:

\du

To get more details use:

\du+

Listing Users via SQL Query

The pg_user view in the pg_catalog schema provides user information. Execute this query:

SELECT * 
FROM pg_catalog.pg_user;

FAQs

How to identify superusers?
Run the following query.

SELECT * 
FROM pg_catalog.pg_user 
WHERE usesuper = true;

How to see currently active users?
Query pg_stat_activity.

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

Why is user authentication crucial?
Authentication confirms the identity of users, ensuring secure database access.

Is user listing fast?
Yes, due to the efficiency of querying system views.

Conclusion

Listing PostgreSQL users is straightforward with psql and SQL queries. For a detailed guide, see the article Postgres List Users: Two Different Approaches.