Which of the following is/are correct?Question 11Select one or more:Select one or more:a.Google's Bigtable does not support schema.b.MongoDB supports the concepts of primary key and foreign key.c.Dynamo doesn’t require a rigid schema before inserting data.d.The concept of schema in MongoDB is flexible, which allows programmers to modify data structure at runtime.
Question
Which of the following is/are correct?Question 11Select one or more:Select one or more:a.Google's Bigtable does not support schema.b.MongoDB supports the concepts of primary key and foreign key.c.Dynamo doesn’t require a rigid schema before inserting data.d.The concept of schema in MongoDB is flexible, which allows programmers to modify data structure at runtime.
Solution
The correct statements are:
a. Google's Bigtable does not support schema: This is incorrect. Google's Bigtable does support schema. It is a distributed storage system for managing structured data that is designed to scale to a very large size.
b. MongoDB supports the concepts of primary key and foreign key: This is incorrect. MongoDB does not support the traditional concept of primary and foreign keys like in SQL databases. However, it does have a unique identifier called '_id' which acts as a primary key.
c. Dynamo doesn’t require a rigid schema before inserting data: This is correct. Amazon's DynamoDB is a NoSQL database that does not require a fixed schema before inserting data. It allows you to start with an initial design and then evolve your schema as your application requirements change.
d. The concept of schema in MongoDB is flexible, which allows programmers to modify data structure at runtime: This is correct. MongoDB is a NoSQL database that
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