Data replication: Delivering information to people who need it

AVEVA Historian allows you to replicate data. That is, a tag that was collected by one historian can be replicated and stored on another historian.

AVEVA Historian supports two types of replication:

• Simple replication
  You can replicate tag data directly using simple replication, where the tag information is replicated directly from one historian to the other. For simple replication, every value for a tag is copied.

• Summary replication
  You can also set up summary tags that receive a summarized version of the tag data.

  Summary replication is useful to minimize bandwidth requirements. This is important, for example, when an application uses a wide-area network or connecting via satellite/cellular.

  Note: Summary replication happens between tier 1 and tier 2 only. All data replication to tier 3 and beyond is simple replication.

• Centralized data
  When you want to replicate data from multiple individual historians and send it to a single centralized historian.
  

• Replicated summaries
  When you want summary data to be available from a centralized historian.
  
  
  

• Many-to-many
  When you want to set up a many-to-many relationship between tiers of historians.
  
  

• Cloud
  When you want data available from the cloud.
  
  

• Multiple levels
  When you want to replicate data to multiple tiers of historians.
  

• Across firewall
  When your facility has a firewall and you want users on both sides of the firewall to have access to the same data.