Effective MySQL Replication Techniques in Depth by Ronald Bradford, Chris Schneider

By Ronald Bradford, Chris Schneider

The crucial advisor to Scaling your online business Solution
Written by way of Oracle ACE Director and MySQL professional Ronald Bradford, with coauthor Chris Schneider, Effective MySQL: Replication recommendations in Depth describes what's had to comprehend and enforce MySQL replication to construct scalable strategies. This publication contains distinct syntax examples to illustrate the beneficial properties, concepts, and obstacles of local MySQL replication. delivering an review of assorted new replication beneficial properties and extra third-party product implementations, this Oracle Press consultant is helping to make sure your MySQL setting can aid a few of the high-availability wishes of your business.

• grasp the strengths and barriers of local asynchronous replication in a MySQL topology
• determine the $64000 good points to enhance replication for turning out to be company necessities
• realize the foremost company elements to figure out your optimum highavailability wishes
• comprehend some great benefits of utilizing MySQL replication for failover eventualities
• establish the major configuration variables and SQL instructions affecting grasp/ slave replication
• know about the developments in replication innovations supplied through new items, together with Tungsten Replicator and Galera
• Optimize your replication administration with quite a few utilities and toolkits

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Tungsten Replicator will be covered in more detail in Chapter 6. It may be time to shard your environment. Sharding is a way to segment data into multiple vertical silos or partitions. Typically, sharding is needed to scale write activity in an environment, meaning expanding the number of master servers you have vertically. If an environment is made up of a master/slave topology where replication lag is prevalent, you may need to move some of the operations to a new master/slave topology.

Setting the system variable, read_only, to 1 or ON is highly recommended to ensure no data modification can occur on a slave. *), this user can bypass the read_only setting on the slave. This is an avoidable problem that is solved by using discretion when creating application user privileges. Running replication while skipping databases and/or tables with --replicate-ignore-db or --replicate-ignore-table can also prove to be a problem. Session data, for example, stored in a database does not generally require replication in most cases; however, if you are ignoring the database or table and need to fail over or rebuild a node, you introduce additional complications.

A success indicator is returned to the calling client program to indicate the completion of the transaction (Point 4). 5. The slave server detects a change has occurred in the master binary log position (Point 5). 6. , a pull process) by the slave server and written to the slave relay log by the slave I/O thread (Point 6). indd 14 9/6/12 2:22 PM Oracle_Flash / Effective MySQL: Replication Techniques in Depth / Bradford / 186-8 15 Diagnosing Common Replication Problems 1 Client Process 4 5 MySQL Kernel 3 2 Data MySQL Kernel InnoDB Trans Log Binary Log Master 6 IO Thread Relay Log 7 SQL Thread Data 8 InnoDB Trans Log Slave Figure 2-1 MySQL replication workflow 7.

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