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How to retrieve from master dabase in T-SQL

Posted on 2011-03-18
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Last Modified: 2012-05-11
I want a list of all databases from the master database categorised into SIMPLE, FULL and BULK-LOGGED recovery models
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Question by:mamlaide
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Ephraim Wangoya earned 500 total points
ID: 35168497

select name, recovery_model_desc
from sys.databases
order by recovery_model
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by:mamlaide
ID: 35168638
I am right to say that if a database is not used for read or write processes that often its recovery model should be always set to SIMPLE
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by:Ephraim Wangoya
ID: 35168670

Not exactly, recovery model is not solely based on how you access your data.
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What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

 

Author Comment

by:mamlaide
ID: 35168697
Can you please explain to me what goes into setting the recovery model as say SIMPLE?
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by:Aaron Shilo
ID: 35168848
credit mike chapple:

Simple Recovery Model
The simple recovery model is just that: simple. In this approach, SQL Server maintains only a minimal amount of information in the transaction log. SQL Server truncates the transaction log each time the database reaches a transaction checkpoint, leaving no log entries for disaster recovery purposes.

In databases using the simple recovery model, you may restore full or differential backups only. It is not possible to restore such a database to a given point in time, you may only restore it to the exact time when a full or differential backup occurred. Therefore, you will automatically lose any data modifications made between the time of the most recent full/differential backup and the time of the failure.

Full Recovery Model
The full recovery model also bears a self-descriptive name. With this model, SQL Server preserves the transaction log until you back it up. This allows you to design a disaster recovery plan that includes a combination of full and differential database backups in conjunction with transaction log backups.

In the event of a database failure, you have the most flexibility restoring databases using the full recovery model. In addition to preserving data modifications stored in the transaction log, the full recovery model allows you to restore a database to a specific point in time. For example, if an erroneous modification corrupted your data at 2:36AM on Monday, you could use SQL Server’s point-in-time restore to roll your database back to 2:35AM, wiping out the effects of the error.

Bulk-logged Recovery Model
The bulk-logged recovery model is a special-purpose model that works in a similar manner to the full recovery model. The only difference is in the way it handles bulk data modification operations. The bulk-logged model records these operations in the transaction log using a technical known as minimal logging. This saves significantly on processing time, but prevents you from using the point-in-time restore option.

Microsoft recommends that the bulk-logged recovery model only be used for short periods of time. Best practice dictates that you switch a database to the bulk-logged recovery model immediately before conducting bulk operations and restore it to the full recovery model when those operations complete.

Those are the basics of SQL Server recovery models.
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by:Ephraim Wangoya
ID: 35168972
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