NewSQL databases overview in DBMS Theory - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a NewSQL database?

A NewSQL database is a modern type of database that combines the scalability of NoSQL systems with the strong consistency and ACID properties of traditional SQL databases.

beginner

Name two key features that distinguish NewSQL databases from traditional SQL databases.

1. High scalability to handle large workloads.
2. Maintaining ACID compliance for reliable transactions.

intermediate

Why were NewSQL databases developed?

They were developed to address the limitations of traditional SQL databases in scaling horizontally while keeping strong consistency, especially for modern web and cloud applications.

beginner

Give an example of a popular NewSQL database.

Examples include Google Spanner, CockroachDB, and VoltDB, which offer distributed architecture with SQL support.

intermediate

How do NewSQL databases differ from NoSQL databases?

NewSQL databases provide SQL support and ACID transactions like traditional databases, while NoSQL databases often sacrifice consistency for scalability and flexibility.

What does ACID stand for in database systems?

A Atomicity, Concurrency, Isolation, Distribution

B Accuracy, Consistency, Integrity, Durability

C Atomicity, Consistency, Isolation, Durability

D Availability, Consistency, Isolation, Durability

ACID stands for Atomicity, Consistency, Isolation, and Durability, which are key properties for reliable database transactions.

Which feature is a main advantage of NewSQL over traditional SQL databases?

A Lack of transaction support

B Better horizontal scalability

C No support for SQL queries

D Only works on single servers

NewSQL databases are designed to scale horizontally across many servers while maintaining SQL and ACID properties.

Which of the following is NOT a characteristic of NewSQL databases?

A Sacrificing consistency for availability

B Use of SQL language

C Designed for modern cloud applications

D Support for distributed transactions

NewSQL databases maintain strong consistency and do not sacrifice it for availability, unlike some NoSQL systems.

Google Spanner is an example of a:

A NewSQL database

B NoSQL database

C Traditional SQL database

D File storage system

Google Spanner is a NewSQL database that supports distributed transactions with strong consistency.

What problem do NewSQL databases mainly solve?

A Lack of SQL support in databases

B Storing unstructured data only

C Replacing all NoSQL databases

D Scaling SQL databases without losing consistency

NewSQL databases focus on scaling SQL databases horizontally while keeping ACID properties intact.

Explain what NewSQL databases are and why they are important in modern data management.

Think about how traditional databases and NoSQL databases differ and what NewSQL tries to achieve.

Describe the main differences between NewSQL and NoSQL databases.

Focus on language support, transaction reliability, and how data is managed.

Practice

1. What is the main advantage of NewSQL databases compared to traditional SQL databases?

easy

A. They use a completely new query language instead of SQL.

B. They provide high scalability while maintaining SQL consistency.

C. They only work with non-relational data.

D. They do not support transactions.

Solution

1. Step 1: Understand traditional SQL limitations

   Traditional SQL databases provide consistency but often struggle with scaling horizontally.

2. Step 2: Identify NewSQL benefits

   NewSQL databases combine the consistency of SQL with improved scalability and speed.

3. Final Answer:

   They provide high scalability while maintaining SQL consistency. -> Option B

4. Quick Check:

   NewSQL = scalable + consistent SQL [OK]

Hint: NewSQL = SQL + modern scalability [OK]

Common Mistakes:

• Thinking NewSQL uses a new query language
• Assuming NewSQL only supports non-relational data
• Believing NewSQL lacks transaction support

2. Which of the following is a correct statement about NewSQL databases?

easy

A. They do not support SQL commands.

B. They are slower than traditional SQL databases.

C. They support standard SQL commands with improved performance.

D. They only work on single-server setups.

Solution

1. Step 1: Recall NewSQL SQL support

   NewSQL databases use standard SQL commands, making them easy to learn for SQL users.

2. Step 2: Understand performance aspect

   They improve performance and scalability compared to traditional SQL databases.

3. Final Answer:

   They support standard SQL commands with improved performance. -> Option C

4. Quick Check:

   NewSQL supports SQL + better speed [OK]

Hint: NewSQL uses SQL commands with speed boost [OK]

Common Mistakes:

• Believing NewSQL does not support SQL
• Thinking NewSQL only works on one server
• Assuming NewSQL is slower than traditional SQL

3. Consider a NewSQL database designed for a high-traffic web app. Which feature is most likely to improve its performance?

medium

A. Horizontal scaling across multiple servers.

B. Using eventual consistency instead of strong consistency.

C. Replacing SQL with NoSQL queries.

D. Disabling transactions to speed up writes.

Solution

1. Step 1: Analyze performance needs

   High-traffic apps need fast, scalable data handling without losing consistency.

2. Step 2: Identify NewSQL scaling method

   NewSQL achieves this by horizontal scaling across servers while keeping SQL consistency.

3. Final Answer:

   Horizontal scaling across multiple servers. -> Option A

4. Quick Check:

   NewSQL scales horizontally for speed [OK]

Hint: NewSQL scales horizontally for speed [OK]

Common Mistakes:

• Confusing eventual consistency with NewSQL's strong consistency
• Thinking NewSQL replaces SQL with NoSQL
• Assuming disabling transactions improves performance

4. A developer tries to use a NewSQL database but faces slow query responses under heavy load. What is a likely cause?

medium

A. The database does not support SQL queries.

B. The developer is using NoSQL commands instead of SQL.

C. NewSQL databases do not support transactions.

D. The database is not configured for horizontal scaling.

Solution

1. Step 1: Identify performance issue cause

   Slow queries under load often mean the database isn't scaling properly.

2. Step 2: Check NewSQL scaling feature

   NewSQL relies on horizontal scaling to handle heavy loads efficiently.

3. Final Answer:

   The database is not configured for horizontal scaling. -> Option D

4. Quick Check:

   Missing horizontal scaling causes slow queries [OK]

Hint: Check if horizontal scaling is enabled [OK]

Common Mistakes:

• Assuming NewSQL doesn't support SQL
• Thinking NoSQL commands are used in NewSQL
• Believing NewSQL lacks transaction support

5. You need to design a financial app requiring fast transactions, strong consistency, and the ability to handle many users simultaneously. Which database type fits best?

hard

A. NewSQL database combining SQL with horizontal scalability.

B. NoSQL database with eventual consistency.

C. Traditional SQL database without scaling features.

D. Flat file storage system.

Solution

1. Step 1: Identify app requirements

   The app needs fast transactions, strong consistency, and scalability for many users.

2. Step 2: Match database features

   Traditional SQL lacks scalability; NoSQL sacrifices consistency; flat files lack transactions.

3. Step 3: Choose NewSQL benefits

   NewSQL offers SQL consistency plus horizontal scalability and speed, ideal for this app.

4. Final Answer:

   NewSQL database combining SQL with horizontal scalability. -> Option A

5. Quick Check:

   NewSQL fits fast, consistent, scalable apps [OK]

Hint: Use NewSQL for fast, consistent, scalable apps [OK]

Common Mistakes:

• Choosing NoSQL despite weak consistency
• Using traditional SQL without scalability
• Selecting flat files for transactional apps