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Displaying posts with tag: ha (reset)
Deep Dive into GTIDs and MySQL 5.6 - What, Why and How

Global Transaction Identifiers (GTIDs) are one of the key replication enhancements in MySQL 5.6. GTIDs make it simple to track and compare replication across a master - slave topology. This enables:

- Much simpler recovery from failures of the master,

- Introduces great flexibility in the provisioning and on-going management of multi-tier or ring (circular) replication topologies.

A new on-demand MySQL 5.6 GTID webinar delivered by the replication engineering team is now available, providing deep insight into the design and implementation of GTIDs, and how they enable users to simplify MySQL scaling and HA. The webinar covers:

- Concepts: What is a GTID? How does the …

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Overwhelming response from the MySQL community in Barcelona

Within hours of my post about meeting the MySQL community in Barcelona, we got several offers to help, and within one day, an event was created and agreed upon.

Thanks!

Today the event was posted at Evenbrite. It will take place on Tuesday, November 13th, at 7pm. It will be a one hour talk about State of the art in MySQL high availability and replication, followed by one hour of Q&A, networking, beer, and snacks.

Registration is necessary, because the seats are limited. If you want to attend, you should register as soon as possible!

New Options for MySQL High Availability

Data is the currency of today’s web, mobile, social, enterprise and cloud applications. Ensuring data is always available is a top priority for any organization – minutes of downtime will result in significant loss of revenue and reputation.

There is not a “one size fits all” approach to delivering High Availability (HA). Unique application attributes, business requirements, operational capabilities and legacy infrastructure can all influence HA technology selection. And then technology is only one element in delivering HA – “People and Processes” are just as critical as the technology itself.

For this reason, MySQL Enterprise Edition is available supporting a range of HA solutions, fully certified and supported by Oracle. MySQL Enterprise HA is …

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MySQL now provides support for DRBD

Oracle has announced that it now provides support for DRBD with MySQL – this means a single point of support for the entire MySQL/DRBD/Pacemaker/Corosync/Linux stack! As part of this, we’ve released a new white paper which steps you through everything you need to do to configure this High Availability stack. The white paper provides a step-by-step guide to installing, configuring, provisioning and testing the complete MySQL and DRBD stack, including:

  • MySQL Database
  • DRBD kernel module and userland utilities
  • Pacemaker and Corosync cluster messaging and management processes
  • Oracle Linux operating system

DRBD is an extremely popular way of adding a layer of High Availability to a MySQL deployment – especially when the 99.999% availability levels delivered by MySQL Cluster isn’t needed. …

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Replication and auto-failover made easy with MySQL Utilities

If you’re a user of MySQL Workbench then you may have noticed a pocket knife icon appear in the top right hand corner – click on that and a terminal opens which gives you access to the MySQL utilities. In this post I’m focussing on the replication utilities but you can also refer to the full MySQL Utilities documentation.

What I’ll step through is how to uses these utilities to:

  • Set up replication from a single master to multiple slaves
  • Automatically detect the failure of the master and promote one of the slaves to be the new master
  • Introduce the old master back into the topology as a new slave and then promote it to be the master again

Tutorial Video

Before going through the steps in detail here’s a demonstration of the replication utilities in action…

To get full …

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MySQL Connect 8 Days Away - Replication Sessions

Following on from my post about MySQL Cluster sessions at the forthcoming Connect conference, its now the turn of MySQL Replication - another technology at the heart of scaling and high availability for MySQL.

Unless you've only just returned from a 6-month alien abduction, you will know that MySQL 5.6 includes the largest set of replication enhancements ever packaged into a single new release:

- Global Transaction IDs + HA utilities for self-healing cluster..(yes both automatic failover and manual switchover available!)

- Crash-safe slaves and binlog

- Binlog Group Commit and Multi-Threaded Slaves for high performance

- …

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Automated MySQL Master Failover

After the GitHub MySQL Failover incident a lot of blogs/people have explained that fully automated failover might not be the most optimal solution.

Fully automated failover is indeed dangerous, and should  be avoided if possible. But a complete manual failover is also dangerous. A fully automated manually triggered failover is probably a better solution.

A synchronous replication solution is also not a complete solution. A split-brain situation is a good example of a failure which could happen. Of course most clusters have all kinds of safe guard to prevent that, but unfortunately also safe guards can fail.

Every failover/cluster should be considered broken unless:

  1. You've tested the failover scripts and procedures
  2. You've tested the failover scripts and procedures under normal load
  3. You've tested the failover scripts and procedures under high load
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MySQL Cluster to InnoDB Replication Howto


In this blog post I will show you how to setup a replication from MySQL Cluster  (ndbcluster) to a regular MySQL Server (InnoDB). If you want to understand the concepts, check out part 7 of our free MySQL Cluster training.


First of all we start with a MySQL Cluster looking like this, and what we want to do is to setup replication server to the Reporting Server (InnoDB slave).




MySQL Cluster is great at scaling large numbers of write transactions or shorter key-based read querise, but not so good at longer reporting or analytical queries. I generally recommend people to limit analytical/reporting queries on the MySQL Cluster, in order to avoid slowing down the …

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MySQL 5.6 Replication: FAQ

On Wednesday May 16th, we ran a webinar to provide an overview of all of the new replication features and enhancements that are previewed in the MySQL 5.6 Development Release – including Global Transaction IDs, auto-failover and self-healing, multi-threaded, crash-safe slaves and more.

Collectively, these new capabilities enable MySQL users to scale for next generation web and cloud applications.

Attendees posted a number of great questions to the MySQL developers, serving to provide additional insights into how these new features are implemented. So I thought it would be useful to post those below, for the benefit of those unable to attend the live webinar (note, you can listen to the On-Demand replay which is available now).

Before getting to the Q&A, there are a couple of other resources that maybe useful to …

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Meet the MySQL Experts Podcast: MySQL Replication Global Transaction Identifiers & HA Utilities

In the latest episode of our “Meet The MySQL Experts” podcast, Luis Soares, Engineering Manager of MySQL Replication discusses the new Global Transaction Identifiers (GTIDs) that are part of the latest MySQL 5.6 Development Release. We are also joined by Chuck Bell who discusses how the new MySQL HA utilities use GTIDs to create a self-healing replication topology.

In the podcast, we cover how GTIDs and the HA utilities are implemented, how they are configured and considerations for their use.

You can also learn more from Luis’ blog on GTIDs in MySQL 5.6 and Chuck’s …

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