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Displaying posts with tag: high-availability (reset)
Webinar: Writing Application Code for MySQL High Availability Followup Questions

Thanks to all who attended my webinar last week on Writing Application Code for MySQL High Availability.  This blog is for me to address the extra questions I didn’t have time to answer on the stream.

What do you think about using Galera Cluster but writing to a single Node with LVS ?

Whatever HA strategy you like that can present  a layer 3 or layer 4 to your application tier is fine.  A lot of people using PXC us it in a single-writer (master/slave) kind of way.

Is there any way we can determine slave lag and then decide to use weather master or slave? for e.g. instead of using query to find if data is available in slave then …. use if lag_time < xyz?

One of my main points was that this is usually more expensive to implement inside your application code than it …

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Announcing: MySQL Fabric 1.5.5 GA is Available!

The MySQL Fabric team is pleased to announce that a new (GA) release is now available. This release includes several improvements in terms of stability and usability (bug fixes and feature enhancements). In a nutshell:

  • Two new types of users for backup and restore are now available allowing a better managements of the required privileges for each user type.

Playing with Percona XtraDB Cluster in Docker

Like any good, thus lazy, engineer I don’t like to start things manually. Creating directories, configuration files, specify paths, ports via command line is too boring. I wrote already how I survive in case when I need to start MySQL server (here). There is also the MySQL Sandbox which can be used for the same purpose.

But what to do if you want to start Percona XtraDB Cluster this way? Fortunately we, at Percona, have engineers who created automation solution for starting PXC. This solution uses Docker. To explore it you need:

  1. Clone the pxc-docker repository:
    git clone https://github.com/percona/pxc-docker
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MaxScale: A new tool to solve your MySQL scalability problems

Ever since MySQL replication has existed, people have dreamed of a good solution to automatically split read from write operations, sending the writes to the MySQL master and load balancing the reads over a set of MySQL slaves. While if at first it seems easy to solve, the reality is far more complex.

First, the tool needs to make sure it parses and analyses correctly all the forms of SQL MySQL supports in order to sort writes from reads, something that is not as easy as it seems. Second, it needs to take into account if a session is in a transaction or not.

While in a transaction, the default transaction isolation level in InnoDB, Repeatable-read, and the MVCC framework insure that you’ll get a consistent view for the duration of the transaction. That means all statements executed inside a transaction must run on the master but, when the transaction commits or rollbacks, the following select statements on the session can be again …

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High availability using MySQL in the cloud

Next Wednesday (June 10) I’ll be co-presenting a webinar on using MySQL in the cloud for High Availability (HA). Joining me will be 451 Research analyst Jason Stamper and together we’ll talk about the realities of HA using MySQL in the cloud and how vendors are responding to changing application requirements with new developments that can enhance your deployment.

We’ll also present a comparison of available solutions along with key best practices you can follow for successfully attaining HA in the cloud with MySQL. The webinar is scheduled for June 10 at 10 a.m. Pacific. Register here.

Together we’ll cover:

  • What do HA MySQL deployments in the cloud look like …
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Test your knowledge: Percona XtraDB Cluster (PXC) quiz

I often talk with people who are very interested in the features of Percona XtraDB Cluster (PXC) such as synchronous and parallel replication, multi-node writing and high availability. However some get confused when operating a real PXC cluster because they do not fully realize the implications of these features. So here is a fun way to test your PXC knowledge: try to solve these 12 questions related to PXC! (you will find the answers at the end of the post.)

Workload

1. With Galera 3.x, support for MyISAM is experimental. When can we expect to have full MyISAM support?
a. This will never happen as Galera is designed for transactional storage engines.
b. This is planned for Galera 4.0.

2. Why aren’t all workloads a good fit for PXC?
a. Execution plans can change compared to a regular MySQL server, so performance is sometimes not as good as with a regular MySQL server.
b. Large …

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Announcing MySQL Utilities release-1.5.4 GA!

The MySQL Utilities Team is pleased to announce the general availability (GA) 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

How Can I Download MySQL Utilities?

You can download MySQL Utilities 1.5.2 GA from the following link using one of the pre-built installation repositories including a source download.

http://dev.mysql.com/downloads/tools/utilities/

Where is the Documentation?

You …

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Typical misconceptions on Galera Replication for MySQL

Even if a Galera node looks like a regular MySQL server, the underlying replication mechanism is very different. This implies some changes in the way you have to configure the Galera nodes. Here are some of the most common misconceptions about Galera when using Percona XtraDB Cluster.

Q: Why should I enable binary logging as it is not needed by Galera replication?
Unlike for regular asynchronous MySQL replication, it is true that you don’t need to enable binary logging to use Galera replication. However what if someone runs an accidental DROP TABLE?

In this case, the statement will be replicated immediately on all nodes. Then your main option to recover lost data is to use a backup. But if binary logging is not …

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Optimizing MySQL for Zabbix


This blog post was inspired by my visit at the annual Zabbix Conference in Riga, Latvia this year, where I gave a couple of talks on MySQL and beyond.

It was a two day single-track event with some 200 participants, a number of interesting talks on Zabbix (and related technologies) and really well-organized evening activities. I was amazed how well organized the event was and hope to be invited to speak there next year as well.   (Just in case you’re not sure what Zabbix is, it is an enterprise-class open source distributed monitoring solution for networks and applications)

I must secretly confess, it was also the first conference …

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High-Availability at MySQL Central

This year’s MySQL Central at Oracle Open World was an exhilarating experience. In contrast to the previous year’s MySQL Connect events, MySQL have now got their own Central at the main Oracle Open World. In the previous years, we were always short on time and trying to get a lot of sessions into just two days was just to much. This time I could both present sessions, attend sessions by other users, and also to talk to people in the MySQL community: something that I really enjoy and also find very valuable to see where we should be heading.

This year, the “MySQL Fabric Team” representation on MySQL Central was me and Narayanan Venkateswaran, which is heading the sharding solution in MySQL Fabric. Together with the conference, we also released MySQL Fabric 1.5.2 as the GA release of MySQL Fabric 1.5 containing a few new features:

  • Server …
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