Three recovery models are offered by every version of SQL Server. These models are Simple, Bulk-Logged and full. Among these three models, commonly used models are simple and full. These models differ in backup and recovery process and affect disk utilization and database performance if that is not properly configured. SQL Server backup and restore operations occur within the recovery model context. Basically, a recovery model is used to control transaction log maintenance.
It is a database property that can control the way in which transactions are logged and also to know whether the transaction log requires backup and the kind of restore operations available.
In this blog, we would discuss the three recovery models and the difference between simple and full recovery model, while any database can be switched to another model at any time.
In case of Simple recovery model database is just same as the last backup. In this model all the transactions like inserts, updates, deletions and other database activities are committed immediately as and when they take place. In this model simply the amount of disc space is required for storing database and it only gets large in the case when numerous transactions take place. As there is no need to maintain the transaction history so as a result the speed of execution increases of SQL database.
Now the query processing gets more time for execution and the task execution also gets faster rather than managing logs. However, there is only a single risk in this process that is catastrophic data loss. Usually, the success of database depends upon its complete transaction management process.
In case of full recovery model, the database is allowed to be restored at a point of time by using the transaction log information that helps to reach at a point at any required time. Here we can take the example of a large database insertion or deletion operation, so in such scenario, the database will be restored just before the action is performed at the database.
Here the SQL Server is managed by more than one organization that that is involved in the transaction. In case of full recovery model, the transaction log remains small enough and database performance is improved a lot as enough recoverable information is now available that can help in case of any database mishap.
Simple and full recovery models are mostly used by the organizations, but sometimes they can get stuck among both and may have to decide that which model is best for them? So to test or for the development of a database simple recovery model is appropriate while for any production database requirement, full recovery model can be the suggested, as it can be also supported by bulk-logged recovery model occasionally.
For a small production database, simple recovery model can be suitable, especially when it is a read-only data warehouse model. In order to choose the best recovery model for any organization, there are two concepts that can help the organizations one is recovery goals and the other is a requirement for the database along with your capability to manage log backups.
You should consider recovery goals and requirements for the database to select the best suitable recovery model. Following listed questions can help you in answering and identifying the availability, requirement and the sensitivity to data loss:
If the answer is yes to above-mentioned questions then you should choose the full recovery database model or Microsoft Distributed Transaction Coordinator.
To know the exact pattern following questions must be answered by the organizations:
In the following listed conditions Simple recovery model may be used:
In the following listed conditions Full recovery model may be used:
Here it is clear that backup and restores operations occur within the recovery model context. The transaction log can be maintained by recovery models. This model controls the way in which the transaction logs are maintained. Many kinds of restore operations are available and the organizations must use the appropriate one. The three recovery models have their own properties and are listed below. Organizations should use the one which is most suitable for them:
|Simple Recovery Model||
|Full Recovery Model||
So as per the requirement and use, organizations can use appropriate recovery model.
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