This post is aimed at explaining users various aspects of disaster recovery plan in SQL database. The post covers aspects like what is included in a disaster recovery plan and how to select a recovery model.
Why Disaster Recovery Plan is So Important?
The most important consideration for any SQL server database administration is to have a recovery plan ready against all potential disasters. A backup and restore strategy that is well-designed as well as tested is only your gateway to recover from the damage caused by disasters like data corruption or errors.
An important thing to consider when designing a disaster recovery plan is to think though all the things that can go wrong such as natural disasters like fire or technical issues like disk failure, etc. Also, make sure to have all the steps prepared to respond to various sorts of disasters. It is very important to test all the steps for each and every scenario involved to establish their effectiveness. In fact it is recommended to conduct a simulation for various disasters.
Considerations while Designing Restore Strategy
Part of backup and restore plan should involve taking into account your special as well as environmental considerations. For example, if fire occurs and damages your last 24 hour data, can you be sure how to recover it? How much time will it take to restore the data and recover SQL database from the damage? How much data can your users afford to lose?
What Do Disaster Recovery Plans Entail?
Part of this plan emphasizes on ironing out certain details. Those details include establishing how long it will take for the plan to recover the data as well as the final state users can expect the database to look like. For example, you can establish that once specific hardware has been acquired, the recovery must be completed within 48 hours. The data users can expect to access data pertaining to the end of the last week.
An administrator can structure a disaster recovery plan in several ways. Following things are covered in a disaster recovery strategy:
- Steps to acquire hardware
- Communication plan
- People to contact in case a disaster happens
- Instructions for people who will be responding to the disaster
- Details of the person owning the administration of disaster recovery plan
- A checklist explaining all the steps to be taken for every single disaster scenario.
Selecting a Recovery Model in SQL Servers
There are primarily three recovery models in SQL Server namely: simple, full, and bulk-logged. A model in its essence controls the way a backup and restore operation will behave in a database.
Select a recovery model that is most optimal for your unique database requirements. Analyze what kind of recovery model will work best for your database depending on the availability and recovery needs. What type of recovery model you choose will affect the possibility of disaster recovery and its success rate in a database.
Resorting to Data Recovery/Repair Software
In case the built-in recovery mechanism in your SQL Server fails to restore the data, you can resort to SQL data recovery software. Do check out features and functionalities of the software and see if it will work for your environment and business needs, before buying one.
Peter Song is a data recovery expert in DataNumen, Inc., which is the world leader in data recovery technologies, including outlook recovery and PDF recovery software products. For more information, visit www.datanumen.com