Aggregate Orientation

Aggregate Orientation

1. Data models

   • Key-Value
     • Free content storage
     • General size limit
     • Access through key
     • No visible structure
   • Document
     • Visible structure
     • Limited content storage
     • Access
       • Fields on the aggregate
       • Flexible
   • Column-family
     • Two-level map
       • Row-oriented
         • Aggregate
       • Column-oriented
         • Record type
     • Storage unit
       • Collection of columns

2. Consequences

   • Aggregate-Ignorant
     • Supports atomic transactions
     • Databases
       • Graph Databases
       • Relational databases
     • No aggregate concept
     • Various types of data examination
   • Running on a cluster
     • Reduction of nodes
   • Supports atomic aggregates

3. Particular data unit

   • Group of related objects
   • Promotes consistency
   • Essential for
     • Replication
     • Sharding