Cloud Datastore

• No relational database
• NoSQL
• Transactional
• ACID support
• Is schema-less
• Uses SQL like language GQL
• One Datastore per project
• Data structure
  • Kind <=> Table
  • Entity <=> Row
  • Property <=> Column
  • Key <=> Primary Key
• Consistency:
  • How up to date are the results ?
  • Does the order matter ?
  • Two types of consistencies:
    • Strongly: order matter but queries are long
    • Eventually: order not matter but queries are very fast