High availability

MySQL high availability management with ClusterControl

Installing and managing a highly available MySQL infrastructure can be really tedious. Solutions to facilitate database and system administrator’s task exist, but few of these cover the complete database lifecycle and address all the database infrastructure management requirements. Severalnines’ product(…)

SQL Server 2014: Availability groups failover impossible with Failover Cluster Manager

A couple of weeks ago, I worked for a customer that wanted to implement SQL Server 2012 (and not SQL Server 214) AlwaysOn with availability groups. During our tests we performed a bunch of failover tests and the customer(…)

SQL Server 2014: AlwaysOn-Verfügbarkeitsgruppen – jetzt mit Microsoft Cloud!

SQL Server 2014 bietet jetzt (oder bald :roll:) die Möglichkeit der Integration von AlwaysOn-Verfügbarkeitsgruppen mittels virtueller Maschinen, gehostet in der Windows-Azure-Infrastruktur (IaaS). Sie können sekundäre Datenbanken direkt in der Cloud vorhalten, wie das Beispiel zeigt:(…)

High availability and disaster recovery on Windows Azure VMs

To be honest, I am not a specialist of Windows Azure. In order to learn a little bit more about this subject, I decided to follow a TechEd Europe 2013 session about High Availability and Desaster Recovery on Windows(…)

Oracle RAC 11.2.0.2: A disturbing loop in a “ohasd” startup script

Last February, I performed an operating system rolling upgrade on a four-nodes RAC cluster (11.2.0.2). I then faced a strange problem when restarting the operating system… The first step of the procedure was to stop all Grid Infrastructure and Database(…)

HA with Oracle Fusion Middleware Forms & Reports 11g R2

In this post, I will explain how to install Oracle Fusion Middleware Forms and Reports 11g R2 for a high availability architecture on a Windows platform. For the Linux platform, it’s approximately the same even though the node manager is(…)

MySQL Data High Availability with semi-synchronous replication

Starting with MySQL 5.5 it is possible to configure semi-synchronous replication. As you probably know, by default, MySQL replication is asynchronous.  Asynchronous replication means that events/transactions applied on one server are not immediately applied on the other one. In the(…)

SQL Server 2012 ‘Denali’ : AlwaysOn High Availability – Restore is blocked

During our test to create a failover clustering with the new function 'AlwaysOn High Availability', we had a few difficulties to overcome like the restoring of databases of the secondary cluster node. In this article, we will just explain you(…)