NoSQL

Explain Polyglot Persistency?
What's Impedance Mismatch?
Why choose a NoSQL database?
How do we choose which NoSQL database?

Data Models

What's the Aggregate Model?
What are the Schemaless Databases?
What's a Materialized View?

Distribution Models

What types of Data Distribution Models are there?
- Single Server (No distribution)
- Sharding
  - Explain Sharding?
  - How does the data being read?
  - How does the data being distributed?
- Replication
  - Explain Replication?
    - What types of Replication are there?
    - Master-slave Replication
      - Explain Master-slave Replication?
    - Peer-to-peer Replication
      - Explain Peer-to-peer Replication?
  - Quorum
    - What's Quorum?
    - What is the replication factor?
    - How many nodes need to get consistency?

Types of NoSQL Databases

What types of NoSQL Databases are there?
- Document databases
  - Name/Explain some Document databases?
    - MongoDB, Terrastore, RavenDB
- Key-value databases
  - Explain how Key-value databases persist an object?
  - Name/Explain some Graph databases?
    - Redis, Memcached, Couchbase, etc.
- Column family stores
  - Explain row-oriented and column-oriented databases differences?
  - What is a super-column?
  - Name/Explain some Column-family databases?
    - Cassandra, HBase, etc.
- Graph databases
  - Name/Explain some Graph databases?
    - Neo4J, Infinite Graph, OrientDB, or FlockDB

CAP Theorem

Explain CAP Theorem?
What's Partition tolerance?
How does Availability or Consistency trade-off when partition tolerant occurred?
Explain BASE (Basically Available, Soft state, Eventual consistency) and its differences with ACID

Consistency In Distribution

What's Write-write conflict?
What's Readwrite conflict?
What's Read-Your-Writes consistency?
Explain pessimistic and optimistic approaches for maintaining consistency?
What is an Inconsistency window?
Version stamps
- How can you detect concurrency conflicts?
- Version stamps Types
  - What's the Counter stamp?
  - What's the GUID stamp?
  - What's the Hash stamp?
  - What's the Timestamp stamp?
- Vector stamp
  - How does Vector stamp work and detect conflicts that occurred in distribution?

Map-Reduce

What's Map-Reduce?
Explain the Basic flow of map-reduce?
What are the Partitioning and Combining phases in map-reduce?