Why do we need message brokers like RabbitMQ over a database like PostgreSQL?

Why do we need message brokers like RabbitMQ over a database like PostgreSQL?

postgresql redis rabbitmq message-queue celery

postgresql

Celery Worker Database Connection Pooling

python postgresql connection-pooling celery

postgresql

Celery and transaction.atomic

django postgresql transactions celery

postgresql

psycopg2 error: DatabaseError: error with no message from the libpq

python postgresql celery python-multiprocessing psycopg

postgresql

Why are my Airflow tasks queued but not running?

postgresql rabbitmq celery airflow

postgresql

Django: Postgres connection not closing

python django postgresql celery webfaction

postgresql

Celery: Use PostgreSQL instead of RabbitMQ

postgresql rabbitmq celery

postgresql

Django model doesn't get saved to database inside Celery Task

python django postgresql redis celery

postgresql

SQLite objects created in a thread can only be used in that same thread with Django 2.2.2 and ipdb

django python-3.x postgresql celery ipdb

postgresql

How to rollback exceptions within celery when using sqlalchemy + postgresql

postgresql sqlalchemy celery pyramid

postgresql

IntegrityError: foreign key not present when doing a get_or_create

django postgresql celery

postgresql

"select_for_update" called from an atomic block still TransactionManagementError

django postgresql celery

postgresql

Docker-compose: bind Celery to Postgres database

postgresql docker-compose celery flask-sqlalchemy

postgresql

PostgreSQL: canceling statement due to conflict with recovery

python postgresql celery amazon-rds

postgresql

Celery raise error while passing my queryset obj as parameter

python django postgresql django-rest-framework celery

postgresql