Managing Objects and Data in Apache Cassandra

Cassandra Essentials Tutorial Series

Agenda Primary interfaces for managing objects and

data The CQL and CLI utilities What is CQL? CQL Basics Examples of using CQL and the CLI Where to get Cassandra

Primary Interfaces for objects/data The Cassandra CLI (command Line Interface) The Cassandra CQL (Cassandra Query

Language) interface

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The Cassandra Command Line Interface (CLI)

Original interface designed to create objects (e.g. column families), input, and manipulate data

The Cassandra Query Language (CQL) Utility

Utility used to create objects/manipulate data using a SQL-like language

The Cassandra Query Language

Objects such as keyspaces, column families, and indexes are created, altered, and removed with RDBMS-like CREATE , ALTER, and DROP

Data is inserted, changed, and removed with DML INSERT, UPDATE, and DELETE commands

Data is queried with the SELECT command CQL has some current limitations and does not

support operations such as GROUP BY, ORDER BY, etc.

Specifying a Data Consistency Option in CQL

Cassandra offers tunable data consistency Choose between strong and eventual consistency (All to any

node responding) depending on the need Can be done on a per-operation basis, and for both reads and

writes Handles Multi-data center operations Done with the USING CONSISTENCY clause

Any One Quorum Local_Quorum Each_Quorum All

Writes One Quorum Local_Quorum Each_Quorum All

Reads

Where to get Cassandra Go to www.datastax.com DataStax makes free smart start installers available for

Cassandra that include: The most up-to-date Cassandra version that is production

quality A version of DataStax OpsCenter, which is a visual, browser-

based management tool for managing and monitoring Cassandra

Drivers and connectors for popular development languages Same database and application Automatic configuration assistance for ensuring optimal

performance and setup for either stand-alone or cluster implementations

Getting Started Guide

For More Information

www.datastax.com

Managing Objects and Data in Apache Cassandra

Cassandra Essentials Tutorial Series