What is a relational DBMS? (Database Management System)
      The modeling of relationships between values. 

This is good because it makes sure everything is consistent. 

Thus it is a repository that sits on the management system. The integrity of the RDBMS is a huge advantage. 

Here are a couple of advantages and disadvantage:
    Advantages
        - for simple data types
        - query
        - better backup procedures
    Disadvantages
        - difficult to distribute and partition
        - difficult to represent hierarchies

ACID vs BASE
     ACID - RDBMS
     BASE - all about availability and performance

NOSQL
       - changes the way it models the data in the sense that it doesn't view everything as a relations 
       - performance is usually better
       - usually stored based on columns or key/value pair

CAP Theorem 
     Consistency
           - single up-to-date copy of the data
     Availability
          - every request reviewed must come with a response 
     Partition Tolerence
          - allowed to lose arbitrary messages.
                       The theorem states that you can only possess two of these traits at any given time.


*Remember this is not good for hard time real time DBS. Only for situations where returning the wrong data doesn't do any damage.