By Ronald Bradford, Chris Schneider
The crucial consultant to Scaling your enterprise Solution
Written through Oracle ACE Director and MySQL specialist Ronald Bradford, with coauthor Chris Schneider, Effective MySQL: Replication ideas in Depth describes what's had to comprehend and enforce MySQL replication to construct scalable strategies. This publication contains exact syntax examples to illustrate the positive aspects, ideas, and boundaries of local MySQL replication. supplying an review of varied new replication gains and extra third-party product implementations, this Oracle Press consultant is helping to make sure your MySQL setting can aid a number of the high-availability wishes of your business.
• grasp the strengths and obstacles of local asynchronous replication in a MySQL topology
• establish the $64000 positive aspects to enhance replication for turning out to be company requisites
• realize the major enterprise elements to figure out your optimum highavailability wishes
• comprehend some great benefits of utilizing MySQL replication for failover situations
• determine the foremost configuration variables and SQL instructions affecting grasp/ slave replication
• find out about the developments in replication recommendations supplied via new items, together with Tungsten Replicator and Galera
• Optimize your replication administration with a number of utilities and toolkits
Find extra exact info and displays at EffectiveMySQL.com.
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Example text
Throughout this book we will discuss different features that affect and can alter this default asynchronous behavior. Interpreting Replication Information Knowing what and where to look for replication information is a key component in the toolbox of a DBA; however, interpreting replication information can sometimes be challenging. Understanding the moving parts, how they act together, and how to view the state of replication are essential steps to administer MySQL. In the following sections we will outline the components of replication and how to use various commands and tools to make informed decisions about your replicated environment.
There are different replication errors that cause either the SQL or I/O slave thread to stop. Running a CHANGE MASTER TO statement and assigning the incorrect master credentials can cause a simple I/O thread error. Replication errors can be as complex as trying to solve a split-brain, primary key issue using multiple masters in a complex replication topology. , slave I/O or SQL thread or both) • Master load • Slave load • Network latency and connectivity issues After you have considered what the problem could be, the next step is to check the MySQL error log.
000002, then MySQL has read up to 671 bytes of the corresponding file. cnf file. cnf file, the relay logs will take their naming convention from the pid-file option if specified. 000001. index, where host_name is the server host and nnnnnn represents the sequential file numbering. All events are recorded in the relay log files from the slave I/O thread. The slave SQL thread will read these events and execute them on the slave host. character_set_client=33,@@session. indd 26 9/6/12 2:22 PM Oracle_Flash / Effective MySQL: Replication Techniques in Depth / Bradford / 186-8 Diagnosing Common Replication Problems 27 Shown in this output is the CREATE TABLE statement that was run and described in the output of the master binary log.