This topic describes the limits of RDS PPAS. To guarantee stability and security, you must understand the limits.

The following table describes the limits of common actions and configurations in RDS PPAS.

Operation Description
Parameter modification Currently not supported
Database root permission RDS does not offer the superuser permission to users.
Database backup You can back up data only through pg_dump.
Data migration to the cloud You can only use psql to restore data backed up by pg_dump.
Set up database replication
  • You do not need to set up data replication because the system has automatically set up PPAS stream replication based the HA mode.
  • The PPAS slave node is invisible to users, and cannot be used directly for access.
Restart an RDS instance You must restart an instance through the RDS console or APIs.
Network settings If the access mode of the instance is safe connection mode, enabling net.ipv4.tcp_timestamps in SNAT mode is not allowed.