Brief talk about types of NoSql databases

1. NoSQL in a nutshell

2. NoSQL is?
- Not Only SQL
- Non-relational
- Horizontally scalable.
- Open-source

3. Pros & Cons
Pros:
- Schema-free: More flexibility in changes.
- Horizontal scaling (Sharding)
- Good fit for large sets and distributed data.
Cons:
- BASE (Basic availability, Soft state, Eventual consistency)
Over
ACID (Atomicity, Consistency, Isolation, Durability)

4. We have this guy ...
Name: Ahmed
Title: S/W Engineer
Works at: YoungCapital (since 2018)
Works with:
- Sjors (Team coach)
- Nora (Product Owner)
- Shannon (S/W engineer)
- Tim (S/W engineer)
4

5. Types of NoSQL databases
- Key-value store.
- Document based store.
- Column based store.
- Graph based store.

6. Key-Value store

7. Key-value store
“Large hash-table”
Basic operations:
- Insert(key, value)
- fetch(key)
- update(key, value)
- delete(key)
Values Data Type?

8. Key-value store
Key: ahmed_record
Value: Employee(name: ‘Ahmed’, works_for: YoungCapital, hired_at: 2018,
works_with: [‘Sjors’, ‘Nora’, ‘Tim’, ‘Shannon’])

9. Document-based store

10. Document-based store
“Pair each key with a data structure known as a document. Documents can
contain many different key-value pairs, or key-array pairs, or even nested
documents.”
- Collection = Table
- Key = Column
- Value = Value
- Document/Object = Record/Row

11. Document-based store

12. Column-based store

13. Column-based store
“Stores data tables by column rather than by row.”
- Keyspace = Database
- Column family = Table
- Row key = Primary key
- Column name/key = Column name
- Column value = Column value

14. Column-based store

15. Graph-based store

16. Graph-based store
- Nodes: represent entities (row in a relational database, document in a
document database).
- Edges: Connect nodes to other nodes; to represent the relationship between
them.
- Properties: For node or Edge.
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17. Graph-based store

18. Conclusion
- NoSQL is NOT a replacement for RDBMS, it depends!
- There is no “best type”, it depends!
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- Usage in Young Capital?
To

19. Bedankt!
Thank you!
!ً‫شكرا‬