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    About Apache Cassandra

    Documentation for developers and administrators on installing, configuring, and using the features and capabilities of Apache Cassandra scalable open source NoSQL database.

    About Apache Cassandra

    About this document

    The latest version of Apache Cassandra™ 3.x is 3.11.5.

    Welcome to the Cassandra documentation provided by DataStax. To ensure that you get the best experience in using this document, take a moment to look at the Tips for using DataStax documentation.

    The landing pages provide information about supported platforms, product compatibility, planning and testing cluster deployments, recommended production settings, third-party software, resources for additional information, administrator and developer topics, and earlier documentation.

    Overview of Apache Cassandra

    Apache Cassandra is a massively scalable open source NoSQL database. Cassandra is perfect for managing large amounts of structured, semi-structured, and unstructured data across multiple datacenters and the cloud. Cassandra delivers continuous availability, linear scalability, and operational simplicity across many commodity servers with no single point of failure, along with a powerful dynamic data model designed for maximum flexibility and fast response times.

    The latest version of Apache Cassandra™ 3.x is 3.9.

    How does Cassandra work?

    Cassandra’s built-for-scale architecture means that it is capable of handling petabytes of information and thousands of concurrent users/operations per second.

    Cassandra is a partitioned row store database

    Cassandra's architecture allows any authorized user to connect to any node in any datacenter and access data using the CQL language. For ease of use, CQL uses a similar syntax to SQL. The most basic way to interact with Cassandra is using the CQL shell, cqlsh. Using cqlsh, you can create keyspaces and tables, insert and query tables, plus much more. This Cassandra release works with CQL for Cassandra 2.2 and later. If you prefer a graphical tool, you can use DataStax DevCenter. For production, DataStax supplies a number drivers so that CQL statements can be passed from client to cluster and back.

    Automatic data distribution

    Cassandra provides automatic data distribution across all nodes that participate in a ring or database cluster. There is nothing programmatic that a developer or administrator needs to do or code to distribute data across a cluster because data is transparently partitioned across all nodes in a cluster.

    Built-in and customizable replication

    Cassandra also provides built-in and customizable replication, which stores redundant copies of data across nodes that participate in a Cassandra ring. This means that if any node in a cluster goes down, one or more copies of that node’s data is available on other machines in the cluster. Replication can be configured to work across one datacenter, many datacenters, and multiple cloud availability zones.

    Cassandra supplies linear scalability

    Cassandra supplies linear scalability, meaning that capacity may be easily added simply by adding new nodes online. For example, if 2 nodes can handle 100,000 transactions per second, 4 nodes will support 200,000 transactions/sec and 8 nodes will tackle 400,000 transactions/sec:

    How is Cassandra different from relational databases?

    Cassandra is designed from the ground up as a distributed database with peer-to-peer communication. As a best practice, queries should be one per table. Data is denormalized to make this possible. For this reason, the concept of JOINs between tables does not exist, although client-side joins can be used in applications.

    What is NoSQL?

    Most common translation is "Not only SQL", meaning a database that uses a method of storage different from a relational, or SQL, database. There are many different types of NoSQL databases, so a direct comparison of even the most used types is not useful. Database administrators today must be polyglot-friendly, meaning they must know how to work with many different RDBMS and NoSQL databases.

    What is CQL?

    Cassandra Query Language (CQL) is the primary interface into the Cassandra DBMS. Using CQL is similar to using SQL (Structured Query Language). CQL and SQL share the same abstract idea of a table constructed of columns and rows. The main difference from SQL is that Cassandra does not support joins or subqueries. Instead, Cassandra emphasizes denormalization through CQL features like collections and clustering specified at the schema level.

    CQL is the recommended way to interact with Cassandra. Performance and the simplicity of reading and using CQL is an advantage of modern Cassandra over older Cassandra APIs.

    The CQL documentation contains a data modeling topic, examples, and command reference.

    How do I interact with Cassandra?

    The most basic way to interact with Cassandra is using the CQL shell, cqlsh. Using cqlsh, you can create keyspaces and tables, insert and query tables, plus much more. If you prefer a graphical tool, you can use DevCenter. For production, DataStax supplies a number of drivers in various programming languages, so that CQL statements can be passed from client to cluster and back.

    How can I move data to/from Cassandra?

    Data is inserted using the CQL INSERT command, the CQL COPY command and CSV files, or sstableloader. But in reality, you need to consider how your client application will query the tables, and do data modeling first. The paradigm shift between relational and NoSQL means that a straight move of data from an RDBMS database to Cassandra will be doomed to failure.

    स्रोत : docs.datastax.com

    Hadoop Cassandra Questions and Answers

    This set of Hadoop Multiple Choice Questions & Answers (MCQs) focuses on “Introduction to Cassandra”. 1. Apache Cassandra is a massively scalable open source _______ database. a) SQL b) NoSQL c) NewSQL d) All of the mentioned 2. Point out the correct statement. a) Cassandra delivers continuous availability, linear scalability, and operational simplicity across many ... Read more

    Hadoop Questions and Answers – Introduction to Cassandra

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    This set of Hadoop Multiple Choice Questions & Answers (MCQs) focuses on “Introduction to Cassandra”.

    1. Apache Cassandra is a massively scalable open source _______ database.

    a) SQL b) NoSQL c) NewSQL

    d) All of the mentioned

    View Answer

    2. Point out the correct statement.

    a) Cassandra delivers continuous availability, linear scalability, and operational simplicity across many commodity servers

    b) Cassandra has a “masterless” architecture, meaning all nodes are the same

    c) Cassandra also provides customizable replication, storing redundant copies of data across nodes that participate in a Cassandra ring

    d) All of the mentioned

    View Answer

    3. Cassandra uses a protocol called _______ to discover location and state information.

    a) gossip b) intergos c) goss

    d) all of the mentioned

    View Answer

    4. A __________ determines which data centers and racks nodes belong to it.

    a) Client requests b) Snitch c) Partitioner

    d) None of the mentioned

    View Answer

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    5. Point out the wrong statement.

    a) Cassandra supplies linear scalability, meaning that capacity may be easily added simply by adding new nodes online

    b) Cassandra 2.0 included major enhancements to CQL, security, and performance

    c) CQL for Cassandra 2.0.6 adds several important features including batching of conditional updates, static columns, and increased control over slicing of clustering columns

    d) None of the Mentioned

    View Answer

    6. User accounts may be altered and dropped using the __________ Query Language.

    a) Hive b) Cassandra c) Sqoop

    d) None of the mentioned

    View Answer

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    7. Authorization capabilities for Cassandra use the familiar _________ security paradigm to manage object permissions.

    a) COMMIT b) GRANT c) ROLLBACK

    d) None of the mentioned

    View Answer

    8. Client-to-node encryption protects data in flight from client machines to a database cluster using ___________

    a) SSL b) SSH c) SSN

    d) All of the mentioned

    View Answer advertisement

    9. Using ___________ file means you don’t have to override the SSL_CERTFILE environmental variables every time.

    a) qlshrc b) cqshrc c) cqlshrc

    d) none of the mentioned

    View Answer

    10. Internal authentication stores usernames and bcrypt-hashed passwords in the ____________ table.

    a) system_auth.creds

    b) system_auth.credentials

    c) system.credentials

    d) sys_auth.credentials

    View Answer advertisement

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    Introduction to Cassandra Flashcards

    https://www.sanfoundry.com/hadoop-questions-answers-introduction-cassandra/ Learn with flashcards, games, and more — for free.

    Introduction to Cassandra

    Term 1 / 10

    Apache Cassandra™ is a massively scalable open source _______ database.

    a) SQL b) NoSQL c) NewSQL

    d) All of the mentioned

    Click the card to flip 👆

    Definition 1 / 10 b) NoSQL

    Cassandra is perfect for managing large amounts of data across multiple data centers and the cloud.

    Click the card to flip 👆

    Created by anamitra_musib1

    https://www.sanfoundry.com/hadoop-questions-answers-introduction-cassandra/

    Terms in this set (10)

    Apache Cassandra™ is a massively scalable open source _______ database.

    a) SQL b) NoSQL c) NewSQL

    d) All of the mentioned

    b) NoSQL

    Cassandra is perfect for managing large amounts of data across multiple data centers and the cloud.

    Point out the correct statement :

    a) Cassandra delivers continuous availability, linear scalability, and operational simplicity across many commodity servers

    b) Cassandra has a "masterless" architecture, meaning all nodes are the same

    c) Cassandra also provides customizable replication, storing redundant copies of data across nodes that participate in a Cassandra ring

    d) All of the mentioned

    d) All of the mentioned

    Cassandra provides automatic data distribution across all nodes that participate in a "ring" or database cluster.

    Cassandra uses a protocol called _______ to discover location and state information

    a) gossip b) intergos c) goss

    d) all of the mentioned

    a) gossip

    Gossip is used for internode communication

    A __________ determines which data centers and racks nodes belong to.

    a) Client requests b) Snitch c) Partitioner

    d) None of the mentioned

    b) Snitch

    Client read or write requests can be sent to any node in the cluster because all nodes in Cassandra are peers.

    Point out the wrong statement:

    a) Cassandra supplies linear scalability, meaning that capacity may be easily added simply by adding new nodes online

    b) Cassandra 2.0 included major enhancements to CQL, security, and performance

    c) CQL for Cassandra 2.0.6 adds several important features including batching of conditional updates, static columns, and increased control over slicing of clustering columns

    d) None of the Mentioned

    d) None of the Mentioned

    Cassandra is a highly scalable, eventually consistent, distributed, structured key-value store

    User accounts may be altered and dropped using the __________ Query Language.

    a) Hive b) Cassandra c) Sqoop

    d) None of the mentioned

    b) Cassandra

    Cassandra manages user accounts and access to the database cluster using passwords.

    Authorization capabilities for Cassandra use the familiar _________ security paradigm to manage object permissions.

    a) COMMIT b) GRANT c) ROLLBACK

    d) None of the mentioned

    b) GRANT

    Once authenticated into a database cluster using either internal authentication, the next security issue to be tackled is permission management

    Client-to-node encryption protects data in flight from client machines to a database cluster using:

    a) SSL b) SSH c) SSN

    d) All of the mentioned

    a) SSL

    Client-to-node encryption establishes a secure channel between the client and the coordinator node.

    Using ___________ file means you don't have to override the SSL_CERTFILE environmental variables every time.

    a) qlshrc b) cqshrc c) cqlshrc

    d) none of the mentioned

    c) cqlshrc

    cqlsh is used with SSL encryption

    Internal authentication stores usernames and bcrypt-hashed passwords in the ____________ table.

    a) system_auth.creds

    b) system_auth.credentials

    c) system.credentials

    d) sys_auth.credentials

    b) system_auth.credentials

    PasswordAuthenticator is an IAuthenticator implementation that you can use to configure Cassandra for internal authentication out-of-the-box.

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    Verified questions

    Computer Science

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    Verified answer Computer Science

    A(n) __________ program translates a high-level language program into a separate machine language program. a. assembler b. compiler c. translator d. utility

    Verified answer Computer Science

    We mentioned that disabling interrupts frequently can affect the system's clock. Explain why this can occur and how such effects can be minimized.

    स्रोत : quizlet.com

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    Mohammed 15 day ago
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