1. NOSQL and CAP Theorem

2. NOSQL NOSQL - Not Only SQL
SQL (and with it relational databases) have dominated the database market for the last 30 years.
Relational databases offer an appealing compromise between performance and the ACID principles making them reliable and performant.
The NOSQL movement is a push for non- relational databases in circumstances that traditional databases are failing.

3. NOSQL Variety There isn't one type of NOSQL database.
NOSQL is defined by what it isn't.
Is CSV NOSQL? Sure (but most wouldn't call it that).
This week, we'll be talking about different Non-SQL databases, how to use them, and their performance and other tradeoffs.
One of the biggest tradeoffs (that we have mentioned before) are related to the CAP theorem.

4. CAP Theorem - Pick 2
Consistency means that each client always has the same view of the data
Availability means that all clients can always read and write
Partition tolerance means that the system works well across physical network partitions.

5. What CAP properties do traditional, relational databases optimize?
1. Consistency
2. Availability
3. Partition Tolerance
4. My Project 5 implementation is terrible, so None.

7. Types of Databases
Relational - (MySQL, Postgres, SQLite) stores data in rigid schemas and because of that an service complicated queries (involving joins) quickly
Column-Based - (Google's BigTable, Apache's Hbase) stores huge amounts of data efficiently
Key-Value - (Amazon's DynamoDB, Facebook's Cassandra) meant for extremely fast retrievals of small amounts of information
Document-Stores - (MongoDB, CouchDB) used as an alternative to relational tables with less rigidity and hierarchical structured objects
Graph-Based - (Neo4J, GraphBase) stores billions of nodes and the edges between them for efficient network/graph traversals.
These types are neither exclusive, nor comprehensive, and some DBMSs transcend each category.

8. Why you should not use NOSQL
SQL is well understood, interoperable between DBMSs, performant for many circumstances, and stable.
Almost every different NOSQL DBMS has its own language, data format restrictions, hardware/OS compatibilities issues, and quirks.
Most of the time, a relational database (like SQLite) is a simpler, faster and better than NOSQL alternatives.
But, there are times when NOSQL is better, but I want to combat some of the hype. NOSQL is generally built for scale, but most of the time, you don't need scale, or you can shift when you do.