To guarantee the instance stability and security, ApsaraDB for PPAS has the following restrictions on use.
| Operations | RDS restrictions |
|---|---|
| Modify database parameter settings | Currently it is 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 | The data backed up by pg_dump can only be restored through psql. |
| Set up database replication | You do not need to set up the data replication because the system has automatically set up the PPAS stream replication based HA mode. The PPAS Standby 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 API. |
| Network setting | If the access mode of the instance is safe connection mode, enabling net.ipv4.tcp_timestamps in SNAT mode is not allowed. |