# Features not supported and features with limited support
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The following Microsoft SQL Server features aren't supported on Amazon RDS: 
+ Backing up to Microsoft Azure Blob Storage
+ Buffer pool extension
+ Custom password policies
+ Data Quality Services
+ Database Log Shipping
+ Database snapshots (Amazon RDS supports only DB instance snapshots)
+ Extended stored procedures, including xp\$1cmdshell
+ FILESTREAM support
+ File tables
+ Machine Learning and R Services (requires OS access to install it)
+ Maintenance plans
+ Performance Data Collector
+ Policy-Based Management
+ PolyBase
+ Replication
+ Server-level triggers
+ Service Broker endpoints
+ Stretch database
+ TRUSTWORTHY database property (requires sysadmin role)
+ T-SQL endpoints (all operations using CREATE ENDPOINT are unavailable)
+ WCF Data Services

The following Microsoft SQL Server features have limited support on Amazon RDS:
+ Distributed queries/linked servers. For more information, see [Implement linked servers with Amazon RDS for Microsoft SQL Server](https://aws.amazon.com/blogs/database/implement-linked-servers-with-amazon-rds-for-microsoft-sql-server/).
+ Common Runtime Language (CLR). On RDS for SQL Server 2016 and lower versions, CLR is supported in `SAFE` mode and using assembly bits only. CLR isn't supported on RDS for SQL Server 2017 and higher versions. For more information, see [Common Runtime Language Integration](https://docs.microsoft.com/en-us/sql/relational-databases/clr-integration/common-language-runtime-integration-overview) in the Microsoft documentation.
+ Link servers with Oracle OLEDB in Amazon RDS for SQL Server. For more information, see [Support for Linked Servers with Oracle OLEDB in Amazon RDS for SQL Server](Appendix.SQLServer.Options.LinkedServers_Oracle_OLEDB.md).

The following features aren't supported on Amazon RDS with SQL Server 2022:
+ Suspend database for snapshot
+ External Data Source
+ Backup and restore to S3 compatible object storage
+ Object store integration
+ TLS 1.3 and MS-TDS 8.0
+ Backup compression offloading with QAT
+ SQL Server Analysis Services (SSAS)
+ Database mirroring with Multi-AZ deployments. SQL Server Always On is the only supported method with Multi-AZ deployments.