Limits

Before you use ApsaraDB RDS for PPAS, you must understand its limits and take the necessary precautions.

The following table lists the limits of ApsaraDB RDS for PPAS.

Item	Limit
Database parameter reconfiguration	Not supported.
Root permissions of databases	ApsaraDB RDS for PPAS does not provide superuser accounts.
Database backup	Data can be backed up only by using the pg_dump plug-in.
Data import	Backed up data can be restored only by using the psql plug-in.
Database replication	The system automatically builds High-availability (HA) database systems based on PPAS streaming replication. Secondary RDS instances are hidden and cannot be directly accessed.
Instance restart	RDS instances must be restarted by using the ApsaraDB for RDS console or API operations.