Week 2 L1

Question 1

How is data stored and managed in MongoDB ?

Answer 1

stored in BSON(Binary JSON)

managed in json

Question 2

How are documents organised in mongo db ?

Answer 2

Document are organised into collections

A collection of documents is loosely comparable in certain respects to a relation of rows

Question 3

How is a document identified in mongo db ?

Answer 3

Using a unique document key. Can be overridden.

Can be generated from timestamp, machine id, process id and counter.

Question 4

How do you create relationships between documents ?

Answer 4

Include one ID of a document in another. (Referencing)

Question 5

Why do we use relational schema ?

Answer 5

defined before data is inserted
Fixed set of fields for all records with fixed datatype and size. Can use null constraints.
New fields means schema must be updated.

Question 6

What do we mean by referential integrity ?

Answer 6

Using PK and FK for relationships

Question 7

What is schema less documents ?

Answer 7

No fixed schema
First document creates collection
Fields can be different and have no fixed type
No integrity checks

Question 8

What is CRUD ?

Answer 8

Create, read update delete?

Question 9

What key words does MongoDB use for crud ?

Answer 9

Insert , find, update, remove