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ApsaraDB RDS:Limits

Last Updated:Sep 02, 2024

This topic describes the limits of ApsaraDB RDS for SQL Server. Before you use ApsaraDB RDS for SQL Server, we recommend that you familiarize yourself with these limits to ensure the stability and security of your database system.

Feature

RDS Cluster Edition

RDS High-availability Edition

RDS Basic Edition

SQL Server 2022 EE on RDS Cluster Edition

SQL Server 2019 EE on RDS Cluster Edition

SQL Server 2017 EE on RDS Cluster Edition

SQL Server 2022 SE

SQL Server 2019 SE

SQL Server 2017 SE

SQL Server 2016 SE and SQL Server 2016 EE

SQL Server 2014 SE and SQL Server 2014 EE

SQL Server 2012 SE and SQL Server 2012 EE

SQL Server 2008 R2

SQL Server 2022 Web and SQL Server 2022 SE

SQL Server 2019 Web and SQL Server 2019 SE

SQL Server 2017 Web and SQL Server 2017 SE

SQL Server 2016 Web, SQL Server 2016 SE, and SQL Server 2016 EE

SQL Server 2014 SE

SQL Server 2012 Web and SQL Server 2012 EE Basic

Maximum number of databases (related to the instance type)

300

300

50

400

Maximum number of database accounts

Unlimited

Unlimited

500

Unlimited

Creation of accounts, logon connections, and databases

Supported

Supported

Supported

Supported

Database-level DDL triggers

Supported

Supported

Not supported

Supported

Database permission authorization

Supported

Supported

Not supported

Supported

Permissions to terminate threads

Supported

Supported

Supported

Supported

Linked server

Supported (Linked servers are not supported for the shared instance family.)

Supported (Linked servers are not supported for the shared instance family.)

Not supported

Not supported

Distributed transaction

Supported

Supported

Not supported

Not supported

SQL Profiler

Supported

Supported

Supported

Supported

Tuning Advisor

Supported

Supported

Not supported

Supported

Change data capture (CDC)

Supported

Supported (This feature is not supported for SQL Server 2012 SE.)

Supported for RDS instances that use cloud disks

Not supported for RDS instances that use local disks

Not supported

Change tracking

Supported

Supported

Not supported

Supported

Logon by using Windows domain accounts

Supported (This feature is not supported for the shared instance family.)

Supported (This feature is not supported for the shared instance family.)

Not supported

Not supported

SQL Server Integration Services (SSIS)

Supported (These features are not supported for the shared instance family.)

Supported (These features are not supported for the shared instance family.)

Not supported

Supported (These features are not supported for the shared instance family.)

SQL Server Analysis Services (SSAS)

SQL Server Reporting Services (SSRS)

Email

Not supported

Not supported

Not supported

Not supported

R Services

Common Language Runtime (CLR)

Asynchronous communication

Publishing and subscription management

Manage policies

Maximum number of databases

An RDS instance that runs SQL Server 2008 R2 supports up to 50 databases. If your RDS instance runs other SQL Server versions, the maximum number of databases varies based on the RDS edition. You can use the following formulas to calculate the maximum number of databases:

  • RDS Cluster Edition/RDS High-availability Edition

    You must extract the square root of the number of CPU cores, round the square root down to the integer, and then multiply the integer by 50. Assume that the obtained value is X. In this example, the maximum number of databases equals the smaller value between X and 300. For example, if your RDS instance runs SQL Server 2016 SE on RDS High-availability Edition and provides 4 CPU cores and 8 GB of memory, the RDS instance supports a maximum of 100 databases.

  • RDS Basic Edition

    You must extract the square root of the number of CPU cores, round the square root down to the integer, and then multiply the integer by 100. Assume that the obtained value is X. In this example, the maximum number of databases equals the smaller value between X and 400. For example, if your RDS instance runs SQL Server 2019 SE on RDS Basic Edition and provides 4 CPU cores and 8 GB of memory, the RDS instance supports a maximum of 200 databases.

Note

min in the preceding formulas indicates that the smaller value between two values is used. For example, the value of min{100,300} is 100.