This Log Buffer edition transcends beyond ordinary and loop in few of the very good blog posts from Oracle, SQL Server and MySQL.

Oracle:

• Variable selection also known as feature or attribute selection is an important technique for data mining and predictive analytics.
• The Oracle Utilities SDK V4.3.0.0.2 has been released and is available from My Oracle Support for download.
• This article provides a high level list of the new features that exist in HFM 11.1.2.4 and details the changes/differences between HFM 11.1.2.4 and previous releases.
• In recent …

Last weekend I got to present to the MySQL Developers Room at FOSDEM in Brussels.

The subject of my presentation was NoSQL and SQL the best of both worlds…

There’s a lot of excitement around NoSQL Data Stores with the promise of simple access patterns, flexible schemas, scalability and High Availability. The downside comes in the form of losing ACID transactions, consistency, flexible queries and data integrity checks. What if you could have the best of both worlds? This session shows how MySQL Cluster provides simultaneous SQL and native NoSQL access to your data – whether a simple key-value API (Memcached), REST, JavaScript, Java or C++. You will hear how the MySQL Cluster architecture delivers in-memory real-time performance, 99.999% availability, on-line maintenance and linear, horizontal scalability …

Thanks to everyone who attended and participated in last week’s webinar on 'Galera Cluster for MySQL vs MySQL (NDB) Cluster: A High Level Comparison'. If you missed the sessions or would like to watch the webinar again & browse through the slides, they are now available online.

In this webinar, Severalnines VP of Products, Alex Yu, who was part of the team at Ericsson who originally developed the NDB storage engine in 2001, gave an overview of the two clustering architectures and discussed their respective strengths and weaknesses: 

1. MySQL Cluster architecture: strengths and limitations
2. Galera Architecture: strengths and limitations
3. Deployment scenarios
4. Data migration
5. Read and write workloads (Optimistic/pessimistic locking)
6. WAN/Geographical replication
7. Schema changes
8. Management and monitoring …

December 8, 2014 By Severalnines

Percona XtraBackup is a great backup tool with lots of nice features to make online and consistent backups, although the variety of options can be a bit overwhelming. s9s_backup tries to make it simpler for users, it creates an easy to use interface for XtraBackup features such as full backups, incremental backups, streaming/non-streaming, and parallel compression.

Backups are organized into backup sets, consisting of a full backup and zero or more incremental backups. s9s_backup manages the LSNs (Log Sequence Number) of the XtraBackups. The backup set can then be restored as one single unit using just one command.

In earlier posts, we covered various ways on restoring your backup files …

September 26, 2014 By Severalnines

Paytrail is a leading e-payment method provider from Finland, and is expanding globally. Established in 2007, Paytrail currently has over 4,000 business customers, works with over 350 partners and its solution is available in all SEPA (Single Euro Payments Area) countries.

Paytrail offers a new online shopping solution that allows consumers to use one login for all of their online purchases. And it provides everything that is needed for online shopping in addition to traditional payment methods (bank e-payments, credit and debit card payments, invoicing and installments). 

This new case study describes how Paytrail came to work with Severalnines to achieve a fault-tolerant database cluster across two data centers.

September 25, 2014 By Severalnines

Coming up with a backup strategy that does not affect database performance or lock your tables can be tricky. How do you backup your production database cluster without affecting your applications? Should you use mysqldump or Percona Xtrabackup? When should you use incremental backups? Where do you store the backups? In this blog post, we will cover some of the common backup methods for Galera Cluster for MySQL/MariaDB, and how you can get the most out of these. 

Backup Method

There are various ways to backup your Galera Cluster data:

• xtrabackup (full physical backup)
• xtrabackup (incremental physical backup)
• mysqldump (logical backup)
• binary logging 
• replication slave

Xtrabackup (full backup)

Xtrabackup is an open-source MySQL hot …

To get more familiar with docker and to create a test setup for MySQL Cluster I created docker images for the various components of MySQL Cluster (a.k.a. NDB Cluster)

At first I created a Fedora 20 container and ran all components in one container. That worked and is quite easy to setup. But that's not how one is supposed to use docker.

So I created Dockerfile's for all components and one base image.

The base image:

• contains the MySQL Cluster software
• has libaio installed
• has a mysql user and group 
• serves as a base for the other images

The management node (ndb_mgmd) image:

• Has ndb_mgmd as entrypoint
• Has a config.ini for the cluster …

Just released - the all new MySQL Cluster training course.

This MySQL Cluster training teaches you how to install and configure a real-time database cluster at the core of your application. Expert instructors will teach you how to design and maintain your clusters for high availability and scalability by using MySQL Cluster's open-source and enterprise components.

This 4-day training course is a must for those who want to learn about MySQL Cluster as you will not only learn about the concepts and features but you will get extensive hands-on experience. You can follow this training course from your own desk via a live-virtual training or by traveling to an education center to follow this course.

Be the first to influence the schedule for this …

As businesses head into the cloud, it is tempting to reach for the first product that offers to make database operation as simple as punching a few buttons on a menu.  However, there’s a big difference between firing up cloud database services such as Amazon RDS for testing or development and finding a solution that can handle hundreds of millions of transactions daily. This webinar-on-demand

We are pleased to inform you that the new Continuent Tungsten 2.0.3 is now available. This is a recommended release for all Continuent Tungsten clustering customers as it contains important updates and improvements to the stability of the manager component, specifically with respect to possible stalls and memory usage that would cause manager failures:

A number of fixes to the Manager