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What is active-active replication?
Active/active replication is a setup in which multiple databases with the same application tables operate independently with changes synchronized between them. An active/active replication setup may only involve two active databases but is certainly not restricted two.
What is replication active/active-active-passive?
As defined on Wikipedia, active replication is performed by processing the same request at every replica. In passive replication, each request is processed on a single replica and then its state is transferred to the other replicas.
Why use active or passive?
It will depend on what you, the writer, want to convey: if you want to draw attention to the doer, use the passive voice; if your intent is to put the focus on the action, then you should go for the active voice.
Is the sentence active or passive?
A sentence is written in active voice when the subject of the sentence is performing the action. A sentence is written in passive voice when the subject of the sentence has something done to it by someone or something. For example: Active voice: The cat was chasing the mouse.
What are active-active services?
An active/active system is a network of independent processing nodes, each having access to a common replicated database such that all nodes can participate in a common application. Any user can be connected to any node over this network. The nodes all have access to two or more copies of the database.
What’s the difference between active replication and passive replication?
There is active replication where each message goes to each node – they are therefore always all in sync and all ready to serve requests. Then there is passive replication, here we have Primary/Replica (master/slave) relationship.
What should happen if failover fails in replication?
According to the failover management software, the master has crashed – there’s no connectivity to it. Still, the replication itself is working just fine. What should happen here is that the failover management software would try to connect to replicas and see what their point of view is.
How does active replication work in MySQL clusters?
Active-Active (Multi-Master) Replication MySQL Cluster allows bi-directional replication between two (or more) clusters. Replication within each cluster is synchronous but between clusters it is asynchronous which means the following scenario is possible:
What happens to the old master when a failover is performed?
When a failover is performed the old master is, in some way, not reachable. It may have crashed, it may have suffered a network partitioning. It cannot be used at a given moment and its state is, typically, unknown.