Book Image

High Availability MySQL Cookbook

By : Alexander Davies
Book Image

High Availability MySQL Cookbook

By: Alexander Davies

Overview of this book

High Availability is something that all web sites hope to achieve, especially those that are linked to big companies.MySQL, an open source relational database management system (RDBMS), can be made highly available to protect from corruption, hardware failure, software crashes, and user error. Running a MySQL setup is quite simple. Things start getting complex when you start thinking about the best way to provide redundancy. There are a large number of techniques available to add 'redundancy' and 'high availability' to MySQL, but most are both poorly understood and documented.This book will provide you with recipes showing how to design, implement, and manage a MySQL Cluster and achieve high availability using MySQL replication, block level replication, shared storage, and the open source Global File System (GFS).This book covers all the major techniques available for increasing availability of your MySQL databases. It demonstrates how to design, implement, troubleshoot and manage a highly available MySQL setup using any one of several techniques, which are shown in different recipes. It is based on MySQL Cluster 7.0, MySQL (for non clustered recipes) 5.0.77, and CentOS / RedHat Enterprise Linux 5.3.The book starts by introducing MySQL Cluster as a technology and explaining how to set up a simple cluster. It will help you to master the options available for backing up and restoring a file in the MySQL Cluster. By following the practical examples in this book, you will learn how to manage the MySQL Cluster. Further, we will discuss some troubleshooting aspects of the MySQL Cluster.We also have a look at achieving high availability for MySQL databases with the techniques of MySQL Replication, block level replication, shared storage (a SAN or NAS), and DRBD.Finally, you will learn the principles of Performance tuning and tune MySQL database for optimal performance.
Table of Contents (17 chapters)
High Availability MySQL Cookbook
Credits
About the Author
About the Reviewers
Preface
Base Installation
Index

Taking an offline backup with MySQL Cluster


The MySQL client RPM includes the binary mysqldump, which produces SQL statements from a MySQL database. In this recipe, we will explore the usage of this tool with MySQL Clusters.

Taking a backup with mysqldump for MySQL Cluster (NDB) tables is identical to other table engines and has all of the same disadvantages—most importantly that it requires significant locking to take a consistent backup. However, it is simple, easy to verify, and trivial to restore from and also provides a way to restore the backup from a MySQL Cluster into a standalone server (for example, by using InnoDB) in the case that a cluster is not available for recovery.

How to do it…

To run mysqldump in the simplest way possible is to execute the following command:

mysqldump [options] db_name [tables]

It is often desirable to backup more than one or all databases. In that case, mysqldump must run with the --all-databases option. It is also often desirable to compress backups on-the...