NoSQL

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

Data Models

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

Distribution Models

What types of Data Distribution Models are there?
- Single Server (No distribution)
- Sharding
  - Explain Sharding?
  - How the data is read?
  - How the data is 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 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 to 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 Partitioning and Combining phases in map-reduce?