BO Linked Universe

Types of Universe

Core Universe

• Universe to which other universes are linked.
• Represents a reusable library of components.
  
• Can be a kernel or master universe depending on the way the core universe components are used in the derived universe.
  

Derived Universe

• Contains a link to the core universe
• Link allows the universe to share the common components
  

Universe Approach

Kernel Universe Approach

• If the linked universe is a kernel universe, then components can be added to the derived universe.
• Any changes made to the kernel universe are automatically reflected in all the derived universes
  

Master Universe Approach

• If the linked universe is a master universe then the derived universe contains all the components of the core universe.
• No new classes and objects are not added to the derived universe but are hidden according to the user needs.
  
• The components visible in the universe are always a subset of the master universe.
  
• Any changes made to the kernel universe are automatically reflected in all the derived universes.
  

Component Universe Approach

• Merging two or more universe into one universe.

Below a new universe is made by merging universe 1 and universe 2.

Advantages of Linked Universe

• Reduced development and maintenance time as any changes made to the core universe are propagated to the derived universe.
• Centralize often used components in core universe, and include them in all the new universes.
  
• Facilitate specialization by splitting the responsibility between database administrator for core universe and specialized universe for more functional universe.
  

Points to remember-Linked Universe

• Linked universes share the same data account.
• Linked universe must be in the same repository.
  
• Core universe must be exported and re-imported at least once.
  
• You have the authorization of linking.
  
• Only one level linking is allowed.
  
• The two universe structures must allow joins to be created between a table in one universe to a table in another universe to avoid Cartesian products.
  
• Contexts must be redetected.
  

Steps to create a Linked universe

We have two universe say Link_SMS and Link_Voice

• Step 1: Link_SMS universe

• Step 2: Link_Voice universe

• Step 3: Edit>Links…>Add Link..>OK

• Step 4: After Linking the Core universe components appear dimmed in the derived universe.

• Step 5: Save the derived universe and export both the core and the derived universe to the same repository.