Switch Between Update Modes for an Updatable Transactional Subscription
This topic describes how to switch between update modes for an updatable transaction subscription in SQL Server 2016 by using SQL Server Management Studio or Transact-SQL. Specify the mode for updatable subscriptions using the New Subscription Wizard. For information about setting the mode when using this wizard, see View and Modify Pull Subscription Properties.
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You can fail over from immediate to queued updating at any time. After you do, however, you cannot return to immediate updating until the Subscriber and Publisher are connected and the Queue Reader Agent has applied all pending messages in the queue to the Publisher.
When an updating subscription to a transactional publication supports failover from one updating mode to another, you can programmatically switch update modes to handle situations when connectivity changes for a short period of time. The update mode can be set programmatically and on demand using replication stored procedures. For more information, see Updatable Subscriptions for Transactional Replication.
To change the update mode after the subscription is created, the update_mode property must be set to failover (which allows a switch from immediate updating to queued updating) or queued failover (which allows a switch from queued updating to immediate updating) when the subscription is created. These properties are set automatically in the New Subscription Wizard.
To set the updating mode for a push subscription
Connect to the Subscriber in SQL Server Management Studio, and then expand the server node.
Expand the Replication folder, and then expand the Local Subscriptions folder.
Right-click the subscription for which you want to set the update mode, and then click Set Update Method.
In the Set Update Method - <Subscriber>: <SubscriptionDatabase> dialog box, select Immediate updating or Queued updating.
To set the updating mode for a pull subscription
In the Subscription Properties - <Publisher>: <PublicationDatabase> dialog box, select a value of Immediately replicate changes or Queue changes for the Subscriber update method option.
For more information about accessing the Subscription Properties - <Publisher>: <PublicationDatabase> dialog box, see View and Modify Pull Subscription Properties.
To switch between update modes
At the Subscriber on the subscription database, execute sp_setreplfailovermode. Specify @publisher, @publisher_db, @publication, and one of the following values for @failover_mode:
queued - fail over to queued updating when connectivity has been temporarily lost.
immediate - fail over to immediate updating when connectivity has been restored.