sys-availability-databases-cluster-transact-sql.md

title	sys.availability_databases_cluster (Transact-SQL)
description	sys.availability_databases_cluster (Transact-SQL)
author	rwestMSFT
ms.author	randolphwest
ms.date	06/10/2016
ms.service	sql
ms.subservice	system-objects
ms.topic	reference
f1_keywords	sys.availability_databases_cluster_TSQL sys.availability_databases_cluster availability_databases_cluster_TSQL availability_databases_cluster
helpviewer_keywords	Availability Groups [SQL Server], monitoring Availability Groups [SQL Server], WSFC clusters sys.availability_databases_cluster catalog view Availability Groups [SQL Server], databases
dev_langs	TSQL

sys.availability_databases_cluster (Transact-SQL)

[!INCLUDE SQL Server]

Contains one row for each availability database on the instance of [!INCLUDEssNoVersion] that is hosting an availability replica for any Always On availability group in the Windows Server Failover Clustering (WSFC) cluster, regardless of whether the local copy database has been joined to the availability group yet.

Note

When a database is added to an availability group, the primary database is automatically joined to the group. Secondary databases must be prepared on each secondary replica before they can be joined to the availability group.

Column name	Data type	Description
group_id	uniqueidentifier	Unique identifier of the availability group in which the availability group, if any, in which the database is participating. NULL = database is not part of an availability replica of in availability group.
group_database_id	uniqueidentifier	Unique identifier of the database within the availability group, if any, in which the database is participating. group_database_id is the same for this database on the primary replica and on every secondary replica on which the database has been joined to the availability group. NULL = database is not part of an availability replica in any availability group.
database_name	sysname	Name of the database that was added to the availability group.

Permissions

If the caller of sys.availability_databases_cluster is not the owner of the database, the minimum permissions required to see the corresponding row are ALTER ANY DATABASE or VIEW ANY DATABASE server-level permission, or CREATE DATABASE permission in the master database.

See Also

sys.availability_groups (Transact-SQL)
sys.databases (Transact-SQL)
sys.dm_hadr_database_replica_states (Transact-SQL)
sys.dm_hadr_database_replica_cluster_states (Transact-SQL)
Overview of Always On Availability Groups (SQL Server)