The SQL Server 2012 offers a plethora of solutions for high-availability that assures 99.999% server and database Availability. These solutions enhance the database and server availability, hide the failures of software or hardware and maintain application availability to curtail user downtime. It simplifies management and deployment of high availability systems with incorporated monitoring and configuration tools. It also enhances performance and cost efficiency of IT utilizing up to four Active Secondary. An SQL Server 2012 High Availability course helps you develop capabilities that contribute in taking your career to new horizons. Some of the key capabilities are utilizing standby hardware to the fullest, implementing disaster recovery and high availability and raising the total application uptime significantly.
SQL Server 2012 High Availability Features
- AlwaysOn Availability Groups- This is a feature of enterprise level that helps in maximizing user database availability. It entails the Server instances of SQL to exist in WSFC (Windows Server Failover Cluster) nodes.
- AlwaysOn Failover Cluster Instances – This feature influences work of WSFC (Windows Server Failover Cluster). It offers high availability locally using the redundancy feature at the level of the server-instance.
- Database Mirroring- It enhances DB availability by providing support to instantaneous failover. DB mirroring can easily be employed for maintenance of a single standby DB or mirror DB, for an equivalent production DB which is called a principal DB.
- Log Shipping-It executes at the DB level. Users can maintain warm standby DBs (or secondary DB) for just one production DB, called the primary DB.
- Multi-site Clustering – Various enterprises have their data centers located in multiple locations. The main reason for such a step is to maintain redundancy and use a secondary data center for disaster recovery. In this way, organizations can protect their site from failure; whether it is infrastructure, power, network or any other on-site disaster.
Several solutions are there that have executed failover clustering of SQL Server and Windows Server with the multi-site model. Multiple nodes are included in a multi-site failover cluster. These nodes are scattered across data centers or various physical sites, aiming to offer availability through data centers if a disaster occurs at any site. At times, multi-site failover clusters are considered as multi-subnet clusters, stretch clusters or failover clusters that are dispersed geographically.
High Availability and Disaster Recovery Methodologies
Mastering the Disaster Recovery and High Availability capabilities in SQL Server 2012 environment helps add on to an IT professional’s existing skill-set and allows them to enjoy a promising career ahead. You can build the competencies necessary for a database administrator, developer or architect to understand and manage SQL Server 2012 internal infrastructure. Here are a few methodologies for high availability and disaster recovery-
- Easy monitoring of the high availability configuration with AlwaysOn dashboard. It is an illustrative configuration to keep your DB up to the mark.
- In case a failover happens, it helps in controlling the same. Also, it helps to remove false instances and DB failover.
- Setting up an Availability Group will ensure multiple database failover as a single unit. This ascertains that the application has all databases available, up and running.
- With Availability Group Listener, you get a comprehensive set of alternative choices and a faultless application failover.
SQL Server 2012 High Availability Benefits
SQL Server 2012 has developed a platform which brings you a good amount of benefits that can add to your SQL server set up. These benefits include-
- Diminished cost of Hardware without shared storage using AlwaysOn.
- For performance improvement, secondary replica can take the load of performing backups rather than unnecessarily burdening the primary server.
- With the AlwaysOn High Availability feature, availability of your applications is enhanced.
- Automated page repair and high latency system support.
- Provides the confidence to deliver mission critical situations.
SQL Server 2012 High Availability is a new course which can prove to be a feather in the cap of IT professionals. They can further their skills in High Availability and Disaster Recovery in SQL Server 2012 setup. SQL Server 2012 offers you everything required for addressing data dependability and availability at the correct time and the correct price at every level of the enterprise. With this, you will learn various techniques for leveraging SQL Server technologies for acquiring high-availability of database solutions.
Reference: Pinal Dave (http://blog.sqlauthority.com)