Apache Cassandra Online Test

Q: What are the main Database tests?

Some important database tests are: MySQL Online Test PostgreSQL Online Test MongoDB Test

The Apache Cassandra Online Test uses scenario-based multiple-choice questions to evaluate candidates on their knowledge and understanding of the distributed NoSQL database management system, Apache Cassandra. The test aims to assess candidates' proficiency in areas such as data modeling, query language (CQL), cluster architecture, replication, data consistency, and performance optimization. It measures their ability to design, deploy, and manage Cassandra clusters in various use cases and their understanding of Cassandra's security and scalability features.

Covered skills:

Data Model and DML Operations
Cassandra Query Language (CQL)
Data Modeling Best Practices
Partitioning and Distribution
Data Replication and Consistency
Cassandra Architecture and Internals
Performance Tuning and Optimization
Backup and Recovery
Security and Authentication

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About the Apache Cassandra Test

The Apache Cassandra Online Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

Ability to design efficient data models in Apache Cassandra
Proficiency in Cassandra Query Language (CQL) for performing data manipulation
Understanding of Cassandra's architecture and internals
Knowledge of data partitioning and distribution strategies in Cassandra
Familiarity with data replication and consistency in Cassandra
Experience in performance tuning and optimization techniques in Cassandra
Ability to design and implement a backup and recovery strategy in Cassandra
Understanding of security and authentication mechanisms in Cassandra
Knowledge of data modeling best practices in Cassandra
Proficiency in handling exceptions and errors in Cassandra
Understanding the basics of Apache Cassandra and its use cases
Awareness of data modeling techniques for efficient storage and retrieval
Familiarity with the various CQL data types and their usage
Ability to tune Cassandra configurations for optimal performance
Knowledge of data distribution strategies for high availability and fault tolerance
Understanding of consistency levels and their impact on data integrity

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Non-googleable questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

How we design questions

These are just a small sample from our library of 15,000+ questions. The actual questions on this Apache Cassandra Online Test will be non-googleable.

🧐 Question
Easy Load/migrate data Data Migration Data Transformation	Solve
Rinsha works at a private equity fund, where they have subscribed to feeds from several companies that track startups. The feeds are delivered in multiple formats such as CSV files, access to their RDBMS or NOSQL (Cassandra) database or daily incremental data. What should Rinsha use in Cassandra to load/ migrate data from one Cassandra cluster to another?
Medium Read Repair and Data Retrieval Mechanics Consistency Level Data Retrieval Read Consistency Distributed Systems	Solve
You're a system architect troubleshooting read inconsistencies on a globally distributed Cassandra cluster. A developer informs you that sometimes when reading data, outdated information is retrieved. You decide to dive deeper into the read path. The application reads data using the following CQL: Given the known facts: 1. The cluster spans three data centers. 2. The replication factor is set as 3 for each data center. 3. The read must return only after fetching data from 2 nodes in each data center. 4. You want to utilize the read repair mechanism to address the inconsistencies. Which consistency level should replace the '?' in the `SELECT` statement to ensure the above requirements?
Medium Replication on nodes Data Insertion Cassandra Replication	Solve
The startup Ro is working at has a Cassandra cluster (Ring) with 7 nodes, and the admin set up a new KeySpace named CoralKeySpace. Ro wants to insert configuration data for their mobile application named CoralApp. The admin has told Ro that the default Replication Factor is 3 on this cluster for CoralKeySpace. Ro inserted 40 records in a table of CoralKeySpace. Which of the following apply? A: Before the insert query, Ro needs to execute a replicate-all command using cqlsh for the session, so that the data can be replicated on 3 nodes. B: After the insert query, Ro needs to execute a replicate-all command using cqlsh, so that the data can be replicated on 3 nodes. C: Ro does not need to do anything, replication is taken care of by Cassandra.

	🧐 Question	🔧 Skill
	Easy Load/migrate data Data Migration Data Transformation	2 mins Cassandra	Solve
Rinsha works at a private equity fund, where they have subscribed to feeds from several companies that track startups. The feeds are delivered in multiple formats such as CSV files, access to their RDBMS or NOSQL (Cassandra) database or daily incremental data. What should Rinsha use in Cassandra to load/ migrate data from one Cassandra cluster to another?
	Medium Read Repair and Data Retrieval Mechanics Consistency Level Data Retrieval Read Consistency Distributed Systems	2 mins Cassandra	Solve
You're a system architect troubleshooting read inconsistencies on a globally distributed Cassandra cluster. A developer informs you that sometimes when reading data, outdated information is retrieved. You decide to dive deeper into the read path. The application reads data using the following CQL: Given the known facts: 1. The cluster spans three data centers. 2. The replication factor is set as 3 for each data center. 3. The read must return only after fetching data from 2 nodes in each data center. 4. You want to utilize the read repair mechanism to address the inconsistencies. Which consistency level should replace the '?' in the `SELECT` statement to ensure the above requirements?
	Medium Replication on nodes Data Insertion Cassandra Replication	2 mins Cassandra	Solve
The startup Ro is working at has a Cassandra cluster (Ring) with 7 nodes, and the admin set up a new KeySpace named CoralKeySpace. Ro wants to insert configuration data for their mobile application named CoralApp. The admin has told Ro that the default Replication Factor is 3 on this cluster for CoralKeySpace. Ro inserted 40 records in a table of CoralKeySpace. Which of the following apply? A: Before the insert query, Ro needs to execute a replicate-all command using cqlsh for the session, so that the data can be replicated on 3 nodes. B: After the insert query, Ro needs to execute a replicate-all command using cqlsh, so that the data can be replicated on 3 nodes. C: Ro does not need to do anything, replication is taken care of by Cassandra.

	🧐 Question	🔧 Skill	💪 Difficulty	⌛ Time
	Load/migrate data Data Migration Data Transformation	Cassandra	Easy	2 mins	Solve
Rinsha works at a private equity fund, where they have subscribed to feeds from several companies that track startups. The feeds are delivered in multiple formats such as CSV files, access to their RDBMS or NOSQL (Cassandra) database or daily incremental data. What should Rinsha use in Cassandra to load/ migrate data from one Cassandra cluster to another?
	Read Repair and Data Retrieval Mechanics Consistency Level Data Retrieval Read Consistency Distributed Systems	Cassandra	Medium	2 mins	Solve
You're a system architect troubleshooting read inconsistencies on a globally distributed Cassandra cluster. A developer informs you that sometimes when reading data, outdated information is retrieved. You decide to dive deeper into the read path. The application reads data using the following CQL: Given the known facts: 1. The cluster spans three data centers. 2. The replication factor is set as 3 for each data center. 3. The read must return only after fetching data from 2 nodes in each data center. 4. You want to utilize the read repair mechanism to address the inconsistencies. Which consistency level should replace the '?' in the `SELECT` statement to ensure the above requirements?
	Replication on nodes Data Insertion Cassandra Replication	Cassandra	Medium	2 mins	Solve
The startup Ro is working at has a Cassandra cluster (Ring) with 7 nodes, and the admin set up a new KeySpace named CoralKeySpace. Ro wants to insert configuration data for their mobile application named CoralApp. The admin has told Ro that the default Replication Factor is 3 on this cluster for CoralKeySpace. Ro inserted 40 records in a table of CoralKeySpace. Which of the following apply? A: Before the insert query, Ro needs to execute a replicate-all command using cqlsh for the session, so that the data can be replicated on 3 nodes. B: After the insert query, Ro needs to execute a replicate-all command using cqlsh, so that the data can be replicated on 3 nodes. C: Ro does not need to do anything, replication is taken care of by Cassandra.

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Why you should use Pre-employment Apache Cassandra Online Test?

The Apache Cassandra Online Test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

Understanding the basic concepts and principles of Apache Cassandra
Performing data modeling and designing efficient data models in Cassandra
Writing efficient CQL queries for data retrieval and manipulation
Applying best practices for data modeling in Cassandra
Understanding and implementing partitioning and distribution strategies in Cassandra
Configuring and managing data replication and consistency in Cassandra clusters
Gaining knowledge of the Cassandra architecture and internal workings
Identifying and implementing performance tuning techniques in Cassandra
Implementing backup and recovery strategies in Cassandra
Ensuring security and authentication in Cassandra applications

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

What topics are covered in the Apache Cassandra Online Test?

Data Model and DML Operations: Data Model and DML Operations encompass the concepts and skills required to design and manipulate data in Cassandra. This skill is crucial to assess as it determines how well candidates can work with the database at a fundamental level.

Cassandra Query Language (CQL): Cassandra Query Language (CQL) is a SQL-like language used to interact with Cassandra. Measuring this skill in the test helps recruiters evaluate candidates' ability to write efficient queries, which is essential for Cassandra database management.

Data Modeling Best Practices: Data Modeling Best Practices involve following industry-recommended guidelines for designing data models in Cassandra. This skill is necessary to evaluate as it assesses candidates' knowledge of optimization techniques and strategies to ensure high performance and scalability.

Partitioning and Distribution: Partitioning and Distribution refer to the process of dividing data across multiple nodes in a Cassandra cluster. Including this skill in the test allows recruiters to assess candidates' understanding of how data is distributed and stored, which directly impacts the performance and fault tolerance of a Cassandra database.

Data Replication and Consistency: Data Replication and Consistency pertain to the mechanisms used in Cassandra to replicate data across nodes and maintain data consistency. Evaluating this skill in the test helps recruiters gauge candidates' knowledge of replication strategies and their understanding of how consistency is achieved in a distributed database.

Cassandra Architecture and Internals: Cassandra Architecture and Internals cover the underlying architecture and inner workings of the Cassandra database. This skill is important to measure as it demonstrates candidates' familiarity with the various components and mechanisms that enable Cassandra's scalability and fault tolerance.

Performance Tuning and Optimization: Performance Tuning and Optimization involve identifying and implementing measures to improve the performance and efficiency of a Cassandra database. This skill should be measured in the test to evaluate candidates' ability to optimize queries, handle large data sets, and fine-tune Cassandra configurations for optimal performance.

Backup and Recovery: Backup and Recovery encompass the techniques and practices used to back up and restore data in Cassandra. Measuring this skill in the test allows recruiters to determine candidates' proficiency in data backup strategies and their ability to recover data in case of failures or disasters.

Security and Authentication: Security and Authentication refer to the mechanisms and procedures employed to secure a Cassandra database from unauthorized access. Including this skill in the test helps recruiters assess candidates' knowledge of authentication methods, encryption techniques, and best practices for safeguarding data in a distributed environment.

Full list of covered topics

The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for Apache Cassandra Online Test to be based on.

Data Model and DML Operations

Cassandra Query Language (CQL)

Data Modeling Best Practices

Partitioning and Distribution

Data Replication and Consistency

Cassandra Architecture and Internals

Performance Tuning and Optimization

Backup and Recovery

Security and Authentication

Keyspaces

Tables

Columns

Primary Keys

Secondary Indexes

Static Columns

Collections

Clustering Columns

Composite Keys

Time Window Compaction Strategy

Leveled Compaction Strategy

Size-Tiered Compaction Strategy

TTL (Time-To-Live)

Batch Operations

Data Modeling for Time-Series Data

Data Modeling for Relational Data

Data Distribution Strategies

Caching and Bloom Filters

Read and Write Path

Hinted Handoff

Gossip Protocol

Snitches

Repair and Anti-Entropy

Performance Monitoring and Metrics

Query Optimization

Materialized Views

Data Compression

Node Operations

Backup and Restore

Datacenter Replication

Encryption and Authorization

Authentication and Role-Based Access Control

SSL/TLS Configuration

Compaction Strategies

Memtable Tuning

Garbage Collection Tuning

Partition Key Selection

Concurrency Control

Data Distribution Schemas

Consistency Levels

Lightweight Transactions

Data Auditing

Schema Evolution

Ring Management

Data Center Awareness

Token Allocation

What roles can I use the Apache Cassandra Online Test for?

Cassandra Developer
Cassandra Solutions Architect
Cassandra DBA
Cassandra Architect
Cassandra Analyst

How is the Apache Cassandra Online Test customized for senior candidates?

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

Designing and optimizing data models for high availability and fault tolerance
Understanding and implementing materialized views in Cassandra
Utilizing secondary indexes effectively in Cassandra
Managing compaction and compaction strategies in Cassandra
Implementing caching strategies for performance optimization in Cassandra
Monitoring and analyzing Cassandra performance metrics
Implementing distributed batch processing with Cassandra
Utilizing virtual nodes to improve cluster scalability and flexibility
Implementing time-series data modeling in Cassandra
Integrating Cassandra with other tools and technologies for data processing

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Have questions about the Apache Cassandra Hiring Test?

What is the Apache Cassandra Online Test?

The Apache Cassandra Online Test evaluates a candidate's proficiency with Apache Cassandra. This test is used by recruiters to screen candidates for roles that require expertise in Cassandra.

Can I combine Apache Cassandra Online Test with Data Modeling Skills questions?

Yes, recruiters can request a custom test that includes Data Modeling Skills questions. Check out the Data Modeling Skills Test for more details.

What topics are evaluated in the Apache Cassandra Online Test?

The test covers a range of topics including Data Model and DML Operations, Cassandra Query Language (CQL), Data Replication and Consistency, Performance Tuning and Optimization, and more.

How to use the Apache Cassandra Online Test in my hiring process?

Use this test before or after resume screening. Purchase the test, send it to candidates, and get results instantly.

Can I test Apache Cassandra and SQL together in a test?

Yes, you can. Combining these skills is recommended for roles requiring both technologies. Check out the MS SQL Test for a combo test.

What are the main Database tests?

Some important database tests are:

Can I combine multiple skills into one custom assessment?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify. Here's a quick guide on how you can request a custom test.

Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

Non-googleable questions
IP proctoring
Screen proctoring
Web proctoring
Webcam proctoring
Plagiarism detection
Secure browser
Copy paste protection

Read more about the proctoring features.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

What experience level can I use this test for?

Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

Does every candidate get the same questions?

Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.

I'm a candidate. Can I try a practice test?

No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

What is the cost of using this test?

You can check out our pricing plans.

Can I get a free trial?

Yes, you can sign up for free and preview this test.

I just moved to a paid plan. How can I request a custom assessment?

Here is a quick guide on how to request a custom assessment on Adaface.

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Along with scorecards that report the performance of the candidate in detail, you also receive a comparative analysis against the company average and industry standards.

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