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Which is better transactional replication or availability group?
The Transactional Replication (TR) is still one of my favourite parts of SQL Server, and provides some distinctive advantages over Always On Availability Group (AG) Read Only secondaries. The TR advantages include : You don’t have to replicate everything when using TR, you can select tables, columns or even data subsets.
Who is the subscriber in transactional replication?
The Publisher or Subscriber is a non- SQL Server database, such as Oracle. By default, Subscribers to transactional publications should be treated as read-only, because changes are not propagated back to the Publisher. However, transactional replication does offer options that allow updates at the Subscriber.
When to use TR or AGS in transactional replication?
When using TR, you can add reporting specific indexes directly to the replicated (slave) database. With AGs you have to add all indexes to the Primary database. When using TR, you can add extra reporting objects (eg Summary tables, stored procedures, views, functions) directly to the replicated database.
How to configure a subscriber availability group for replication?
For transactional replication, use the following steps to configure and failover a subscriber availability group: Before creating the subscription, add the subscriber database to the appropriate Always On availability group. Add the subscriber’s availability group Listener as a linked server to all nodes of the availability group.
What is the difference between failover clustering and AlwaysOn?
AlwaysOn FailOver Clustering (FCI) is associated with Windows Services FailOver Clustering (WSFC). This is a High Availability (HA) scenario where two (or more) servers share a SAN, or WAN, or NAS. The first server is the Active Node (Node1). The second server is the Passive Node (Node2).
Which is better transactional replication or AG mirroring?
You can also eliminate triggers, constraints and other definitions that add no value to a reporting implementation. TR sends deltas and therefore minimises data transfer traffic just like AG but TR has the flexibility of continuous or scheduled data transfers. AG mirroring has only continuous data transfer.
What happens when an always on availability group fails?
When an Always On availability group containing a database that is a replication subscriber fails over, the replication subscription might fail. For transactional subscribers, the distribution agent will continue to replicate automatically if the subscription is using the name of the availability group listener of the subscriber.
How to create a transactional replication push subscription?
Using the script in the Creating a Transactional Replication Push Subscription section below, create the subscription using the name of the availability group listener of the subscriber.