A question I often hear when customers want to set up a production PXC cluster is: “How many nodes should we use?”

Three nodes is the most common deployment, but when are more nodes needed? They also ask: “Do we always need to use an even number of nodes?”

This is what we’ll clarify in this post.

This is all about quorum

I explained in a previous post that a quorum vote is held each time one node becomes unreachable. With this vote, the remaining nodes will estimate whether it is safe to keep on serving queries. If quorum is not reached, all remaining nodes will set themselves in a state where they cannot process any query (even reads).

To get the right size for you cluster, the only question you should answer is: how many nodes can simultaneously fail while leaving the …

The consumerization of IT and the integration of BYOD throughout the enterprise in recent years has made the customer king. And this means the end-user experience has become critical. The latest figures show that if your site doesn’t do a full page load in 3 seconds or less, then your customers will leave and abandon you and head over to your competitors site to spend their money there. Customers simply have no patience for slow, erratic, or downed websites. And this is why keeping your business-critical applications running optimally and efficiently is crucial for the success of your organization. Without this you might as well close up shop.

Application performance monitoring is the key to ensuring that the …

VividCortex is sponsoring and exhibiting at O’Reilly’s OSCON in Portland, Oregon this year. We will be at booth 429, serving up hats and database monitoring demos.

Click here for more details and registration.

The Log Buffer Edition once again is sparkling with some gems, hand-picked from Oracle, SQL Server and MySQL.

Oracle:

• Oracle GoldenGate 12.1.2.1.1  is now certified with Unity 14.10.  With this certification, customers can use Oracle GoldenGate to deliver data to Teradata Unity which can then automate the distribution of data to multiple Teradata databases.
• How do I change DNS servers on Exadata storage servers.
• Flushing Shared Pool Does Not Slow Its Growth.
• …

Taxonomy upgrade extras: jobDBAsupportWer sind wir?

FromDual ist das führende unabhängige Beratungs- und Dienstleistungsunternehmen für MySQL, Galera Cluster, MariaDB und Percona Server in Europa mit Hauptsitz in der Schweiz.

Unsere Kunden stammen hauptsächlich aus Europa und reichen vom kleinen Start-Up bis zur europäischen Top-500 Firma. Sie erhalten von uns Support bei Datenbank-Problemen, direkte Eingriffe als remote-DBA, Schulung für ihre DBAs und Entwickler sowie Beratung bei Architektur- und Design-Entscheidungen. Ausserdem entwickeln wir Tools rund um MySQL, schreiben Blog-Artikel und halten Vorträge bei Konferenzen.

Da unsere …

Recently want to install Percona XtraDB Cluster + HAProxy + KeepAlived on CentOS 7, but could not find any all-in-one guide. So decided to write down all steps necessary for getting started and running HA solution using Open Source projects. Nowadays high availability is one of the main concerns faced by big and small companies.Minimum wasting of time (downtime per year), sustainably working of infrastructure and etc. is the main mission for all companies that they are trying to achieve.There are different approaches to this mission. One of them as large companies did, to buy expensive software and support from vendors. But small companies could not go through these steps. The true power of Open Source comes up at these moments.You can build your own High Availability solution using free but yet powerful Open Source projects. In this article we will show you how to achieve Database Clustering and Load Balancing. We will use:

1. …

MySQL India team is back with another MySQL user camp.

The day of the week, time and venue remains the same:

Date: Jun 26th, 2015

Day : Friday

Time: 3-5:30 pm

Place: OC001, Block1, B wing, Kalyani Magnum Infotech Park, J.P Nagar, 7th Phase Bangalore, India

During our previous meetings we were requested by our attendees that they would like to hear about implementation of GTID by the MySQL community. We have listened to you and requested a community member to talk about their experience with the implementation of  GTID. Our first talk is :

• MySQL Tools Usage in Rakuten and Overview of Replication GTIDs

There is also a lot of interest in our new delivery vehicles for MySQL packages. Using the new YUM repos you can stay up to date with the latest MySQL releases. You need not  wait for your distro to update MySQL in their release …

Relational databases are ubiquitous in OpenStack: practically every OpenStack service stores its critical metadata in a database, and the MySQL family of databases is the de-facto standard for OpenStack relational data storage. The need for high availability for these relational datastores is obvious. Galera is the default multi-master strongly-consistent replication facility for highly-available relational data in OpenStack. In this webinar, we are joined by independent OpenStack expert Florian Haas to illustrate the ins and outs of Galera for OpenStack.

Speaker bio: Florian Haas is an open source software specialist, experienced technical consultant, seasoned training instructor, and frequent public speaker. He has spoken at conferences like LinuxCon, OSCON, linux.conf.au, the OpenStack Summit, the MySQL Conference and Expo, and countless user and meetup groups across the globe.

Duration: 60 minutes

…

In this tutorial, I will explain how to initialize and configure a Node.js+Express.js, Compass (CSS framework), and Bootstrap (front end UI framework) project.

Please note that the tutorial expects all programs already installed and installation instructions will not be provided in this tutorial. However, it should be easy to find out how to install each program.

MySQL 5.6.25 was recently released (it is the latest MySQL 5.6, is GA), and is available for download here.

For this release, there are 2 “Functionality Added or Changed” items of note:

• Functionality Added/Changed: MySQL distributions now include an innodb_stress suite of test cases. Thanks to Mark Callaghan for the contribution. (Bug #76347)
• Functionality Added/Changed: my_print_defaults now masks passwords. To display passwords in cleartext, use the new –show option.

In addition to those, there were 55 other bug fixes:

• 10 InnoDB
•   8 Replication
•   3 Partitioning (one overlaps w/ an InnoDB bug fix)
• 35 Miscellaneous (and 6 of …