This brief presentation describes the interfaces for managing objects and data in Apache Cassandra.

1. Cassandra Essentials Tutorial Series
Managing Objects and
Data in Apache
Cassandra

2. 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

3. Primary Interfaces for objects/data
 The Cassandra CLI (command Line Interface)
 The Cassandra CQL (Cassandra Query
Language) interface
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4. The Cassandra Command Line Interface (CLI)
 Originalinterface designed to create objects
(e.g. column families), input, and manipulate
data

5. The Cassandra Query Language (CQL) Utility
 Utility
used to create objects/manipulate data
using a SQL-like language

6. 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.

7. 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
Writes Reads
 Any  One
 One  Quorum
 Quorum  Local_Quorum
 Local_Quorum  Each_Quorum
 Each_Quorum  All
 All

8. 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

9. For More Information
www.datastax.com

10. Cassandra Essentials Tutorial Series
Managing Objects and
Data in Apache
Cassandra