To switch between update modes To switch between updating modes, you must enable the publication and subscription for both update modes, and then switch between them if necessary. Azure SQL Data Warehouse Parallel Data Warehouse Because queued updating subscriptions allow modifications to the same data at multiple locations, there may be conflicts when data is synchronized at the Publisher. In this case, another Subscriber or the Publisher updated the same row in the publication before this Subscriber transaction was synchronized. If conflicts are expected: Transactional replication supports updates at Subscribers through updatable subscriptions and peer-to-peer replication. By updating the publication with the GUID from the transaction, you have matching row versions in the publication and in the transaction. Ensure that the user-defined trigger does not fire when the replication trigger updates the table. The new GUID in the publication indicates that two different row versions exist: The following conflicts can occur: If you plan to switch between update modes, the Queue Reader Agent must run at least once after the subscription has been initialized by default, the Queue Reader Agent runs continuously.
This conflict happens when the same data is changed at two locations. This is because set updates made at the Subscriber are propagated by replication as individual UPDATE statements for each row affected. When data is updated at a Subscriber, it is first propagated to the Publisher and then propagated to other Subscribers. Conflicts are detected and resolved according to a conflict resolution policy that is set when creating the publication. When the conflict resolution policy is set to Subscriber Wins, updates to primary keys should be made with caution. Transactional replication with Queued updateable subscribers could experience slow performance when unique filtered indexes are used. Publisher wins the default Publisher wins and the subscription is reinitialized Subscriber wins Conflicts are recorded and can be viewed using the Conflict Viewer. To create updatable subscriptions for transactional publications, see Create an Updatable Subscription to a Transactional Publication Management Studio Switching Between Update Modes When using updatable subscriptions you can specify that a subscription should use one update mode and then switch to the other if the application requires it. Unlike merge replication, the use of a GUID column is not used to identify the row itself, but is used to check if the row has changed. You can then switch between update modes if necessary. Because the updates are propagated asynchronously to the Publisher, the same data may have been updated by the Publisher or by another Subscriber and conflicts can occur when applying the updates. Transactional replication supports updates at Subscribers through updatable subscriptions and peer-to-peer replication. Avoid using this feature in new development work, and plan to modify applications that currently use this feature. Ensure that the user-defined trigger does not fire when the replication trigger updates the table. If the publication allows immediate updating subscriptions and an article in the publication has a column filter, you cannot filter out non-nullable columns without defaults. This ensures that outstanding transactions do not conflict with the pending schema change. Considerations for Using Updatable Subscriptions After a publication is enabled for updating subscriptions or queued updating subscriptions, the option cannot be disabled for the publication although subscriptions do not need to use it. The new GUID in the publication indicates that two different row versions exist: If the Subscriber database is partitioned horizontally and there are rows in the partition that exist at the Subscriber but not at the Publisher, the Subscriber cannot update the pre-existing rows. Attempting to update these rows returns an error. If queued updating is used, the changes are stored in a queue; the queued transactions are then applied asynchronously at the Publisher whenever network connectivity is available. To update large objects at a Subscriber, use the data types varchar max , nvarchar max , varbinary max instead of text, ntext, and image data types, respectively. If you create a publication with stored procedures, you can enable one or both options. If conflicts are expected: Conflict detection and resolution can be a time-consuming and resource-intensive process; therefore, it is best to minimize conflicts in the application by creating data partitions so that different Subscribers modify different subsets of data.
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