Book Image

Apache Cassandra Essentials

By : Nitin Padalia
Book Image

Apache Cassandra Essentials

By: Nitin Padalia

Overview of this book

Apache Cassandra Essentials takes you step-by-step from from the basics of installation to advanced installation options and database design techniques. It gives you all the information you need to effectively design a well distributed and high performance database. You’ll get to know about the steps that are performed by a Cassandra node when you execute a read/write query, which is essential to properly maintain of a Cassandra cluster and to debug any issues. Next, you’ll discover how to integrate a Cassandra driver in your applications and perform read/write operations. Finally, you’ll learn about the various tools provided by Cassandra for serviceability aspects such as logging, metrics, backup, and recovery.
Table of Contents (14 chapters)
Apache Cassandra Essentials
About the Author
About the Reviewers

Write operations

In Cassandra, both UPDATE and INSERT statements are write operations, which means that these operation don't do any reading before writing. This implies that, if we're executing an UPDATE operation on a primary key and the row for that primary key doesn't exist, UPDATE will insert a new row.

Similarly, if we're performing an INSERT operation and the row mentioned in the INSERT operation identified by the primary key already exists in the database, that row will be overwritten by our INSERT operation.

This is why we call them UPSERT operations as well.


UPSERT operations are valid operations in Cassandra and won't throw any errors.