To guarantee instance stability and security, ApsaraDB for PostgreSQL has the following restrictions.

Operations RDS restrictions
Modify database parameter settings Currently it is not supported.
Database root permission RDS does not offer the superuser permission.
Database backup Data backup can only be performed through pg_dump.
Data migration Data backed up through pg_dump can only be restored through psql.
Build database replication

The system automatically builds the HA mode based on PostgreSQL stream replication.

The PostgreSQL standby node is invisible and cannot be accessed directly.

Restart the RDS instance The instance must be restarted through the RDS console or Open APIs.
Network setting If the access mode of the instance is safe connection mode, enabling net.ipv4.tcp_timestamps in SNAT mode is not allowed.