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Wang , Deng Ke 79b1bc1455 RDS UMN 20221101 version 
Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>
Co-authored-by: Wang , Deng Ke <wangdengke2@huawei.com>
Co-committed-by: Wang , Deng Ke <wangdengke2@huawei.com>
2023-01-09 10:26:58 +00:00

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PostgreSQL Constraints

Table 1 shows the constraints designed to ensure the stability and security of RDS for PostgreSQL.

Table 1 Function constraints

Function Item

Constraints

Database access
  • If public accessibility is not enabled, the RDS DB instance must be in the same VPC as the ECS.
  • RDS read replicas must be created in the same subnet as the primary DB instance.
  • The security group must allow access from the ECS.

    By default, RDS cannot be accessed through an ECS in a different security group. You need to add an inbound rule to the RDS security group.

  • The default RDS port is 5432. You can change it if you want to access RDS through another port.

Deployment

ECSs in which DB instances are deployed are not visible to users. You can access the DB instances only through an IP address and a port number.

Database root permissions

Only the root user permissions are provided on the instance creation page.

NOTE:

The root user has the following permissions: Create role, Create DB, and Replication.

Database parameter modification

Most parameters can be modified on the RDS console.

Data migration

Use psql to import data by referring to Migrating Data to RDS for PostgreSQL Using psql.

Database replication setup

RDS for PostgreSQL uses a primary/standby dual-node replication cluster. You do not need to set up replication additionally. The standby DB instance is not visible to users and therefore you cannot access it directly.

DB instance reboot

DB instances cannot be rebooted through commands. They must be rebooted through the RDS console.

RDS backup files

For details, see Downloading a Full Backup File.

You can rebuild a DB instance from the recycle bin to restore data.
Parent topic: Constraints