Using master-master for MySQL? To be frankly we need to get rid of that architecture. We are skipping the active-active setup and show why master-master even for failover reasons is the wrong decision.

So why does a DBA thinks master-master is good for in a failover scenario?

• The recovered node does get his data automatically.
• You need not to use a backup for recovery.

Please remember: MySQL Replication is async

Again: MySQL Replication is async. Even the so called semi-sync Replication!

So following is quite likely.

See a nice master-master setup:

 activ                 standby
+------+     c        +------+
|      |------------->|      |
|abcd  |              |ab    |
|      |              |      |
|      |<-------------|      |
+------+              +------+

Oh my god the node went down:

 …

Check Out Our Latest Technical Resources for MySQL, MariaDB, Postgres and MongoDB Clusters

Like every month, we have created new content and tools for you; here is a summary of what we’ve published. Please do check it out and let us know if you have any comments or feedback.

New Live Technical Webinar

Introducing the New ClusterControl with Live Demo on 24th of March

Johan Andersson, CTO at Severalnines will walk us through the latest edition of ClusterControl and its new features in the form of a live demo. Johan will go over the latest features in ClusterControl including the recently announced support for Postgres. …

Percona is glad to announce the new release of Percona XtraDB Cluster 5.6 on March 5th 2015. Binaries are available from downloads area or from our software repositories.

Based on Percona Server 5.6.22-72.0 including all the bug fixes in it, Galera Replicator 3.9, and on Codership wsrep API 25.8, Percona XtraDB Cluster 5.6.22-25.8 is now the current …

The below description was added to the MySQL Cluster 7.4 source code
and describes how new nodes are added into the heartbeat protocol at
startup of a node.

The protocol to include our node in the heartbeat protocol starts when
we call execCM_INFOCONF. We start by opening communication to all nodes
in the cluster. When we start this protocol we don't know anything about
which nodes are up and running and we don't which node is currently the
president of the heartbeat protocol.

For us to be successful with being included in the heartbeat protocol we
need to be connected to all nodes currently in the heartbeat protocol. It
is important to remember that QMGR (the source code module that
controls the heartbeat handling) sees a node as alive if it is included
in the heartbeat protocol. Higher level notions of aliveness is handled
primarily by …

In the previous tutorial, we have learned about the basics of Vagrant. In this tutorial, we will move to next level and will learn more about Vagrant and setting up LAMP development environment in Vagrant. To start with, LAMP stands for: Linux (OS/Kernel), Apache (Web Server), MySQL (Database), PHP (Scripting Language). It is an open-source Web development environment which lets you create web applications. It is generally also referred as Web Stack.

Last week we announced our new query and metric listing and detail pages, which provide deep drilldown into individual queries and metrics for exploration and analysis. Today I want to show you one of the new features included in the Metric detail page. We have used it in a variety of scenarios for customers and for our internal analysis. We’ll cover some of the usage cases and success stories in future blog posts; here I’ll just give an overview of the capability.

To begin with, suppose you found a metric with an interesting shape and wanted to know something about it. This is very typical, by the way – you will see a bump or notch in a graph and wonder what it means, what else bumped or notched or behaved oddly around this time. Here’s our metric. In this case, CPU makes a good demo:

Look, ma! There’s a bump in …

MariaDB 10.0.17 was recently released, and is available for download here:

https://downloads.mariadb.org/mariadb/10.0.17/

This is the eighth GA release of MariaDB 10.0, and 18th overall release of MariaDB 10.0.

For the most part, there are not a whole lot of new changes to report for this release, but there is a new version of the Audit Plugin and many other engines have been updated as well.

Here are the main items of note:

1. The new version of the Audit Plugin is 1.2 is included with the following new features:
   • In the audit log passwords are now masked, i.e. the password characters are replaced with asterisks.
   • It’s now possible to filter logging to include only DDL (CREATE, ALTER, etc.) or DML (INSERT, UPDATE, etc.) statements.
   • For more information …

MariaDB 10.0.16 was recently released (~1.5 months ago on 1/27/2015 – sorry for the delay on my end – I was just extra busy in my spare time recently), and is available for download here:

https://downloads.mariadb.org/mariadb/10.0.16/

This is the seventh GA release of MariaDB 10.0, and 17th overall release of MariaDB 10.0.

For the most part, there are not a whole lot of changes to report for this release, but there are 2 enhancements of note – one being the JSON table type (still *experimental*) and the other a new variable to aid with index statistics calculations on large tables, as well as some security fixes.

Here are the main items of note:

1. Updates to the CONNECT handler (supporting the …

When looking at Percona live Santa Clara 2015 agenda I saw two intriguing conferences : - JSON support in MySQL 5.7 – Docstore: document database for MySQL at Facebook

Both conference are talking about supporting a native JSON type in MySQL ! This sounds really great. I have never seen any blog post or github [...]

The MySQL Utilities Team is pleased to announce a new alpha release of MySQL Utilities. This release includes a number of improvements for useabilty, stability, and a few enhancements. A complete list of all improvements can be found in our release notes.

New Enhancements!
This release represents a stable release of the product. Along with several defect patches, we also include the following enhancements.

Improved support for MySQL 5.7 early releases
Improved output for mysqldbcompare
Improved SSL support

New Utilities!
This release also has three new utilities for you to try out:

mysqlslavetrx - skip transactions on one or more slaves to solve errant transactions and consistency errors - …