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Storage Tier - Mendel Rosenblum CS142 Lecture Notes

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Storage Tier - Mendel Rosenblum CS142 Lecture Notes

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Questions and Answers

What is the purpose of a database schema?

To generate the model data of a view quickly

To handle app evolution over time

To fetch correct app data

To provide a good organization of storing application data (correct)

Which type of data organization does the relational model use?

Key-Value pairs

Tables (correct)

JSON documents

Graphs

What is one of the key features of a good storage system according to the text?

Being easily scalable from all over the world

Quickly generating model data for views

Storing data in multiple formats like files, objects, and networks

Always being fault tolerant and reliable (correct)

How are rows in a relational database table also known as?

Tuples Signup and view all the answers

What is the main role of a Mongoose model in a MongoDB database?

Creating and managing database schemas Signup and view all the answers

Which type of system property is crucial for a storage system's availability?

'Always available' even with many concurrent requests Signup and view all the answers

What is the purpose of a primary key in a database table?

Organize data around accesses Signup and view all the answers

In the context of web applications, what does Rails' Active Record do?

Maps objects to database records Signup and view all the answers

What is MongoDB's data model based on?

Collections containing documents Signup and view all the answers

How does MongoDB ensure fast lookups?

By utilizing indexes for quick retrieval Signup and view all the answers

Which feature of NoSQL databases like MongoDB aims to handle scalability and reliability?

Handling scalability and reliability Signup and view all the answers

How do web applications benefit from using secondary keys in database tables?

Improve query performance for specific fields Signup and view all the answers

What is the purpose of relational algebra in SQL?

To assist in querying relational databases efficiently Signup and view all the answers

In a database, what is the primary function of keys and indexes?

To provide a way to access specific rows quickly Signup and view all the answers

What does the AUTO_INCREMENT attribute in SQL help with?

It generates unique values for a column automatically Signup and view all the answers

Which SQL command is used to delete specific rows from a table based on a condition?

DELETE FROM Signup and view all the answers

Why are indexes important for database performance?

To optimize query performance by allowing fast data retrieval Signup and view all the answers

What is the main benefit of using structured query language (SQL) for querying databases?

It offers efficient ways to extract specific information from a database Signup and view all the answers