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How to join a secondary database to an always on availability group?
This topic explains how to join a secondary database to an Always On availability group by using SQL Server Management Studio, Transact-SQL, or PowerShell in SQL Server. After you prepare a secondary database for a secondary replica, you need to join the database to the availability group as soon as possible.
Is the SQL Server always on availability group readable?
These availability databases are hosted by the availability replicas and can be readable- writable at the primary replica and up to eight sets of secondary replica databases that can be configured to be read-only databases.
How to configure read-only access to secondary availability group?
To configure connection access for the secondary role, in the ADD REPLICA or MODIFY REPLICA WITH clause, specify the SECONDARY_ROLE option, as follows: SECONDARY_ROLE ( ALLOW_CONNECTIONS = { NO | READ_ONLY | ALL } )
How to configure secondary availability group replica in SQL?
If you are adding or modifying a replica of an existing availability group, use the ALTER AVAILABILITY GROUP Transact-SQL statement. To configure connection access for the secondary role, in the ADD REPLICA or MODIFY REPLICA WITH clause, specify the SECONDARY_ROLE option, as follows:
How to join a secondary replica to an availability group?
The secondary replica must already be joined to the availability group. For more information, see Join a Secondary Replica to an Availability Group (SQL Server). The secondary database must have been prepared recently.
How to change availability group in SQL Server?
Expand the availability group that you want to change, and expand the Availability Databases node. Right-click the database, and click Join to Availability Group. This opens the Join Databases to Availability Group dialog box.
How to improve query performance on Secondary replicas?
Querying sys.dm_db_index_physical_stats reveals significant fragmentation of the clustered index. Unjoining the database from the Always On Availability Group improves performance on the same (former) secondary replica instance, so that it is similar to performance on the primary replica.