---
title: "Always On Availability Groups Functions (Transact-SQL) | Microsoft Docs"
ms.custom: ""
ms.date: "03/17/2017"
ms.prod: sql
ms.prod_service: "database-engine"
ms.reviewer: ""
ms.technology: system-objects
ms.topic: "language-reference"
dev_langs: 
  - "TSQL"
ms.assetid: 293cc233-8688-4823-9887-176ed772f53d
author: MikeRayMSFT
ms.author: mikeray
---
# Always On Availability Groups Functions (Transact-SQL)
[!INCLUDE[tsql-appliesto-ss2012-xxxx-xxxx-xxx-md](../../includes/tsql-appliesto-ss2012-xxxx-xxxx-xxx-md.md)]

  [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] provides the following Always On Availability Groups functions.  
  
## In This Section  
 [sys.fn_hadr_is_primary_replica](../../relational-databases/system-functions/sys-fn-hadr-is-primary-replica-transact-sql.md)  
  
 [sys.fn_hadr_backup_is_preferred_replica](../../relational-databases/system-functions/sys-fn-hadr-backup-is-preferred-replica-transact-sql.md)  
  
 [sys.fn_hadr_distributed_ag_replica](../../relational-databases/system-functions/sys-fn-hadr-distributed-ag-replica-transact-sql.md)  
  
 [sys.fn_hadr_distributed_ag_database_replica](../../relational-databases/system-functions/sys-fn-hadr-distributed-ag-database-replica-transact-sql.md)