Distribution Models

Distribution Models

1. Single server

   • No distribution
   • One machine
     • Reads
     • Writes
     • Running database
   • Convenient
     • Graph databases

2. Sharding

   • Better performance
     • Many user accesses
     • Not alone
       • Data resiliency

3. Master-Slave Replication

   • Disadvantages
     • Inconsistency
   • All nodes
     • Read
     • Receive updates
   • Reporting updates
     • Most nodes

4. Peer-to-Peer Replication

   • Roles
     • One master node
       • Propagates updates
     • Slave nodes / readers
   • Advantages
     • Scaling
       • Supports intensive reading
     • No available master
       • Slaves can still read
     • Quick recovery
       • Replacement
         • Master by one slave
   • Disadvantages
     • Not good for intensive writing
     • Inconsistency
       • Incomplete propagation of updates

5. Sharing and Replication Combination

   • Numerous masters
     • One master per data item