Db2 Mirror concepts

This section describes the basic concepts you need to understand when working with Db2® Mirror.

Architecture
The Db2 Mirror architecture consists of two nodes that are paired together to create a synchronous environment. The nodes are independent, and by default, can access and update the data that is synchronously replicated in both directions. Db2 Mirror supports replication of data in SYSBAS and in independent auxiliary storage pools (IASPs). Applications can use either SQL or traditional record level access (RLA) to work with replicated data.
RDMA over Converged Ethernet
The two nodes in a mirrored pair require a high-speed network connection to perform synchronous data replication.
Network Redundancy Groups
A Network Redundancy Group (NRG) is a construct that hides the complexity associated with automated physical network redundancy, failover, and load balancing of connections between the two nodes.
Replication states
The Db2 Mirror replication state needs to be understood and monitored. The replication state indicates whether replication is active, tracking, or blocked.
Replication-eligible objects
The Db2 Mirror environment supports replication of the object types that are typically updated in user applications.
Replication Criteria List
The Replication Criteria List (RCL) is a rules engine used by Db2 Mirror to determine whether an object should be replicated.
Independent auxiliary storage pools
For objects to be replicated in an independent auxiliary storage pool (IASP), the IASP must be registered so that it is known to Db2 Mirror. If the IASP is not registered, no objects within the IASP will be replicated.
Disaster recovery
Db2 Mirror is a continuous availability option, usually deployed within a single data center. Many environments also require a disaster recovery solution. Various technologies exist for disaster recovery solutions, such as IBM PowerHA® SystemMirror® for i, logical replication, and full system hardware replication.
User interface
When setting up, managing, and monitoring the Db2 Mirror environment, there are two interfaces that can be used: the IBM Db2 Mirror for i Graphical User Interface (GUI) and SQL services, consisting of SQL procedures, functions, and views.
Terminology and definitions
Terms used when working with Db2 Mirror are defined in this section.

Parent topic: Db2 Mirror