Limitations

• Connection Limits: The value for max_connections is calculated based on RAM size.

RAM Size	max_connections
4GB	384
5GB	512
6GB	640
7GB	768
8GB	896
> 8GB	1000

The superuser needs to maintain the state and integrity of the database, which is why the platform reserves 11 connections for internal use: connections for superusers, see superuser_reserved_connections for replication.

Note: The total upper limit for CPU cores, RAM, and Storage depends on your contract limits.

• Backups: Storing cluster backups in an IONOS S3 Object Storage is limited to the last 7 days.

• IP Ranges: The following IP ranges cannot be used with our PostgreSQL services:

  • 10.208.0.0/12

  • 10.233.0.0/18

  • 192.168.230.0/24

  • 10.233.64.0/18

Note: Enable PgBouncer for connection pooling when your application creates many short-lived connections or when client connections may exceed PostgreSQL’s max_connections. PgBouncer keeps backend processes low, improves latency, and protects the database from connection overload. For activation instructions, see Activating the connection pooler (PgBouncer).