Requirements and limitations for Amazon RDS Custom for SQL Server - Amazon Relational Database Service
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Requirements and limitations for Amazon RDS Custom for SQL Server

Following, you can find a summary of the Amazon RDS Custom for SQL Server requirements and limitations for quick reference. Requirements and limitations also appear in the relevant sections.

Region and version availability

Feature availability and support varies across specific versions of each database engine, and across Amazon Web Services Regions. For more information on version and Region availability of Amazon RDS with Amazon RDS Custom for SQL Server, see Supported Regions and DB engines for RDS Custom for SQL Server.

General requirements for RDS Custom for SQL Server

Make sure to follow these requirements for Amazon RDS Custom for SQL Server:

Limitations for RDS Custom for SQL Server

The following limitations apply to RDS Custom for SQL Server:

  • You can't create read replicas in Amazon RDS for RDS Custom for SQL Server DB instances. However, you can configure high availability automatically with a Multi-AZ deployment. For more information, see Managing a Multi-AZ deployment for RDS Custom for SQL Server.

  • You can't modify the DB instance identifier of an existing RDS Custom for SQL Server DB instance.

  • For an RDS Custom for SQL Server DB instance that wasn't created with a custom engine version (CEV), changes to the Microsoft Windows operating system aren't guaranteed to persist. For example, you lose these changes when you initiate a snapshot or point-in-time restore operation. If the RDS Custom for SQL Server DB instance was created with a CEV, then those changes are persisted.

  • Not all options are supported. For example, when you create an RDS Custom for SQL Server DB instance, you can't do the following:

    • Change the number of CPU cores and threads per core on the DB instance class.

    • Turn on storage autoscaling.

    • Specify your own DB parameter group, option group, or character set.

    • Turn on Performance Insights.

    • Turn on automatic minor version upgrade.

  • The maximum DB instance storage is 64 TiB.

  • You can't use RDS Proxy with RDS Custom for SQL Server.

  • You can't use the describe-reserved-db-instances API for RDS Custom for SQL Server DB instances.