Apache Cassandra在线测试

About the test:

Apache Cassandra在线测试使用基于方案的多项选择问题来评估候选人的知识和对分布式NOSQL数据库管理系统Apache Cassandra的了解。该测试旨在评估候选人在数据建模，查询语言（CQL），群集体系结构，复制，数据一致性和性能优化等领域的熟练程度。它衡量了他们在各种用例中设计，部署和管理Cassandra集群的能力，以及他们对Cassandra的安全性和可扩展性功能的理解。

Covered skills:

数据模型和DML操作
数据建模最佳实践
数据复制和一致性
性能调整和优化
安全性和身份验证

Cassandra查询语言（CQL）
分区和分配
卡桑德拉建筑和内部
备份和恢复

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9 reasons why

Adaface Apache Cassandra在线测试 is the most accurate way to shortlist 卡桑德拉开发人员s

Reason #1

Tests for on-the-job skills

The Apache Cassandra在线测试 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:

在Apache Cassandra中设计有效的数据模型的能力
精通Cassandra查询语言（CQL）进行数据操纵
了解卡桑德拉的建筑和内部
了解卡桑德拉的数据分配和分发策略的知识
熟悉卡桑德拉的数据复制和一致性
Cassandra的性能调整和优化技术的经验
在卡桑德拉设计和实施备份和恢复策略的能力
了解卡桑德拉的安全性和身份验证机制
了解卡桑德拉的数据建模最佳实践
熟练处理卡桑德拉的例外和错误
了解Apache Cassandra及其用例的基础知识
了解有效存储和检索的数据建模技术的意识
熟悉各种CQL数据类型及其用法
能够调整Cassandra配置以获得最佳性能
了解高可用性和容错性数据分配策略的知识
了解一致性水平及其对数据完整性的影响

Reason #2

No trick questions

Traditional assessment tools use trick questions and puzzles for the screening, which creates a lot of frustration among candidates about having to go through irrelevant screening assessments.

View sample questions

The main reason we started Adaface is that traditional pre-employment assessment platforms are not a fair way for companies to evaluate candidates. At Adaface, our mission is to help companies find great candidates by assessing on-the-job skills required for a role.

Why we started Adaface

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Reason #3

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

这些只是我们库中有10,000多个问题的一个小样本。关于此的实际问题 Apache Cassandra在线测试将是不可行的.

🧐 Question
Easy Load/migrate data	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	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	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	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	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	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	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	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	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.

Reason #4

1200+ customers in 75 countries

借助 Adaface，我们能够将初步筛选流程优化高达 75% 以上，为招聘经理和我们的人才招聘团队节省了宝贵的时间！

Brandon Lee, 人事主管, Love, Bonito

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Reason #5

Designed for elimination, not selection

The most important thing while implementing the pre-employment Apache Cassandra在线测试 in your hiring process is that it is an elimination tool, not a selection tool. In other words: you want to use the test to eliminate the candidates who do poorly on the test, not to select the candidates who come out at the top. While they are super valuable, pre-employment tests do not paint the entire picture of a candidate’s abilities, knowledge, and motivations. Multiple easy questions are more predictive of a candidate's ability than fewer hard questions. Harder questions are often "trick" based questions, which do not provide any meaningful signal about the candidate's skillset.

Science behind Adaface tests

Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the Apache Cassandra在线测试 from your dashboard by entering their email address.

Public link: You can create a public link for each test that you can share with candidates.

API or integrations: You can invite candidates directly from your ATS by using our pre-built integrations with popular ATS systems or building a custom integration with your in-house ATS.

Reason #7

Detailed scorecards & benchmarks

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Reason #8

High completion rate

Adaface tests are conversational, low-stress, and take just 25-40 mins to complete.

This is why Adaface has the highest test-completion rate (86%), which is more than 2x better than traditional assessments.

Reason #9

Advanced Proctoring

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About the Apache Cassandra在线测试

Why you should use Apache Cassandra在线测试?

The Apache Cassandra在线测试 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:

了解Apache Cassandra的基本概念和原理
在Cassandra中执行数据建模和设计有效的数据模型
为数据检索和操作编写有效的CQL查询
在卡桑德拉（Cassandra）应用最佳实践
理解和实施卡桑德拉的分区和分配策略
在Cassandra集群中配置和管理数据复制和一致性
了解Cassandra架构和内部工作
识别和实施卡桑德拉的性能调整技术
在卡桑德拉实施备份和恢复策略
确保Cassandra应用程序中的安全性和身份验证

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在线测试?

cassandra查询语言（CQL）
cassandra查询语言（CQL）是一个SQL样语言用于与Cassandra互动。在测试中衡量此技能有助于招聘人员评估候选人编写高效查询的能力，这对于Cassandra数据库管理至关重要。
数据建模最佳实践
数据建模最佳实践涉及遵循行业的实践 - 计划在Cassandra设计数据模型的指南。在评估候选人对优化技术和策略以确保高性能和可伸缩性的知识时，这项技能是必要的。
分区和分配
分区和分配是指除分隔的过程Cassandra群集中多个节点的数据。在测试中包括此技能，招聘人员可以评估候选人对数据的分布和存储方式的理解，这直接影响了Cassandra数据库的性能和容错性。
数据复制和一致性</h4> < p>数据复制和一致性与卡桑德拉（Cassandra）在跨节点复制数据并保持数据一致性的机制有关。评估该测试中的这项技能有助于招聘人员候选人对复制策略的了解及其对分布式数据库中一致性的理解。</p> <h4> cassandra架构和内部结构
cassandra Architection </h4> <p>涵盖Cassandra数据库的基础架构和内部工作。该技能对于衡量很重要，因为它证明了候选人对能够可伸缩性和容错性的各种组件和机制的熟悉。
性能调整和优化
性能调整和优化涉及识别性能调整和优化并采取措施提高Cassandra数据库的性能和效率。应在测试中测量此技能，以评估候选人优化查询，处理大数据集的能力和微调Cassandra配置以获得最佳性能。
备份和恢复
备份恢复涵盖了用于备份和恢复卡桑德拉数据的技术和实践。测量测试中的这一技能使招聘人员能够确定候选人对数据备份策略的熟练程度及其在发生故障或灾难时恢复数据的能力。
安全性和身份验证
安全性和身份验证请参阅未经授权访问中使用Cassandra数据库的机制和程序。在测试中包括此技能，有助于招聘人员评估候选人对身份验证方法，加密技术的了解以及在分布式环境中保护数据的最佳实践。
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在线测试 to be based on.
数据模型和DML操作
Cassandra查询语言（CQL）
数据建模最佳实践
分区和分配
数据复制和一致性
卡桑德拉建筑和内部
性能调整和优化
备份和恢复
安全性和身份验证
键空间
表
列
主键
次要索引
静态列
收藏
聚类列
复合键
时间窗口压实策略
水平的压实策略
尺寸分层的压实策略
ttl（持续时间）
批处理操作
时间序列数据的数据建模
关系数据的数据建模
数据分配策略
缓存和开花过滤器
读写路径
提示的交接
八卦协议
小偷
修复和抗透镜
绩效监控和指标
查询优化
物有意见
数据压缩
节点操作
备份还原
数据中心复制
加密和授权
身份验证和基于角色的访问控制
SSL/TLS配置
压实策略
可靠的调整
垃圾收集调整
分区密钥选择
并发控制
数据分布模式
一致性水平
轻量级交易
数据审核
模式进化
戒指管理
数据中心意识
令牌分配

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What roles can I use the Apache Cassandra在线测试 for?

卡桑德拉开发人员
卡桑德拉解决方案建筑师
卡桑德拉DBA
卡桑德拉建筑师
卡桑德拉分析师

How is the Apache Cassandra在线测试 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