Understanding the Concept of High Availability and How it is achieved in SQL Server

In a hyper thconnected world, the idea of long server or application downtimes does go well with businesses. Hence there is an increasing emphasis on making application available around the clock without fail. Now the concept of high availability is intrinsically linked to the expectation of the user base of an application. This is typically measured against the actual time a service or application was up against the expected uptime and result multiplied by hundred to get the percentage. A lot of commercial applications and services claim to offer a 99% uptime. This essentially means that in a calendar year, the service or the application can only be down for three days and fifteen hours at max.


Companies that can ensure high availability have a clear business edge

If your line of business application or commercial service has a reputation of being reliable and always available, it goes a long way in making customers stick with you in the long run. High availability if achieved can serve as a key cornerstone for your business and attract customers who prefer robust services round the clock.


High Availability in SQL Server

Traditionally the challenge of keeping the database available at all points of time was achieved with the help of disk mirroring. However it had peculiar flaws which made it less than ideal solution for large corporate applications. From its 2012 iteration, SQL Server ships with AlwaysOn availability groups which have dynamically redefined how we look at making high availability possible. When you are running a data center on the latest version of SQL Server, you can be assured that your applications are very unlikely to fail due to a database crash.

Another area where AlwaysOn availability groups make a distinct mark is planned downtimes. Since the new technology allows for minimal deployment choices and even rolling upgrades, the time associated with planned downtimes can be drastically reduced. Further in a virtualized environment, with this new feature, you get the flexibility to quickly shift between different virtual machines without any downtime at all.


A SQL Recovery Tool serves as your last line of Defense

While AlwaysOn availability groups go a long way ensuring the security of your data, they by no means completely full proof. Hence you need to invest in a powerful sql recovery tool like the potent DataNumen SQL Recovery to act the last line of defense. In case of a SQL crash, this versatile program can swing into action and draw out all important data records within minutes. Moreover the tool is also designed to deal with accidental deletion of records or file corruption caused due to logical errors. The tool is rather easy to use and it can draw out data from myriad media types including mirrored disk images. Last but not the least, it capacity to negotiate SQL files of nearly any size helps it top popularity charts.


Author Introduction:

Alan Chen is President & Chairman of DataNumen, Inc., which is the world leader in data recovery technologies, including access recovery and sql recovery software products. For more information visit https://www.datanumen.com/

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