Recently
one of my colleague at work informed that on development database he
executed a DELETE query but forgot to place WHERE clause and committed
the transaction. Though the database server was a development server but
still they don’t want to miss any entry, that’s why they don’t want to
restore database from full backup, which was taken three days ago.
Thanks
to point in time recovery option which helped us to restore our
database without losing a single record to a specific time.
For point in time recovery your database
· Must be in FULL RECOVERY MODEL
· Must have a valid FULL BACKUP
What is current recovery model of your database?
SELECT name,recovery_model_desc
FROM sys.databases
You
can change recovery model from SSMS by right click on your desired
database >>click properties -- > on left, select options and
change recovery model. Or you can do it with following tsql.
USE [master]
GO
ALTER DATABASE [AdventureWorks] SET RECOVERY FULL WITH NO_WAIT
How to check backup history click here
(After problem has occurred and you need a point in time recovery)
1. You
must check that your database is in full recovery model and valid FULL
backup is already taken. Create a transaction log backup by using
graphical interface or just executing following tsql.
BACKUP LOG [AdventureWorks] TO DISK = N'E:\EmergencyLogBackup.trn' WITH
NOFORMAT, NOINIT, NAME = N'AdventureWorks-Transaction Log Backup', SKIP,
NOREWIND, NOUNLOAD, STATS = 10
2. Create a full backup of database for safe side.
3. Restore your full database backup BUT with “RESTORE WITH NORECROVERY” option
4. Now
restore your currently created Transaction Log Backup, with “WITH
RECOVERY” option, BUT up to your desired time. In our example we will
restore our Transaction Log file up to 3:30PM.
RESTORE LOG [AdventureWorks]
FROM DISK = 'E:\EmergencyLogBackup.trn'
WITH RECOVERY,
STOPAT = 'Jan 03, 2011 03:30:00 PM'
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