In SQL Server, a backup log with norecovery is a type of backup that is used to create a full database backup. A full database backup is a copy of the entire database, including the data and the transaction log. The transaction log records all the changes that are made to the database.
When you create a backup log with norecovery, SQL Server does not copy the transaction log to the backup file. This means that the backup is not a usable copy of the database. However, it does create a copy of the database that can be used to restore the database to a point in time.
If you need to restore the database to a point in time, you can use the backup file to restore the database. Then, you can use the transaction log to restore the transaction log. This will restore the database to the point in time that the backup was taken.
If you are using SQL Server 2005 or later, you can use the WITH NO_LOG clause to create a backup log with norecovery. This clause tells SQL Server not to copy the transaction log to the backup file.
When you create a backup log with norecovery, you should be aware of the following:
– The backup is not a usable copy of the database.
– The backup can be used to restore the database to a point in time.
– The backup file can be used to restore the database if the transaction log is lost.
– If you are using SQL Server 2005 or later, you can use the WITH NO_LOG clause to create a backup log with norecovery.
Contents
- 1 How do I back up my tail log?
- 2 How do I backup a tail log in SQL?
- 3 Can we perform a tail log backup if MDF file is corrupted?
- 4 Which of the option is used to take the log backup in case of data file crash?
- 5 How can I backup MDF and LDF file in SQL Server?
- 6 How do I restore a database with Norecovery?
- 7 What is differential data backup?
How do I back up my tail log?
A tail log is a log file that records all the activity that has taken place on a server since the last time the log was cleared. This can be helpful for troubleshooting purposes, as it allows you to review the activity that has occurred on the server since the last time the log was cleared.
If you need to back up your tail log, you can use a tool like rsync to create a backup of the log file. To do this, you can run the following command:
rsync -avz /var/log/apache2/access.log /path/to/backup/directory
This will create a copy of the access.log file in the /path/to/backup/directory directory.
How do I backup a tail log in SQL?
Backing up a tail log in SQL is a relatively simple process. In order to do so, you will need to use a utility such as mysqldump. Below is an example of how to backup a tail log in SQL using mysqldump:
mysqldump -u username -p password –opt –single-transaction –all-databases > backup.sql
Can we perform a tail log backup if MDF file is corrupted?
Yes, you can still perform a tail log backup even if the MDF file is corrupted. This is possible because the tail log backup only copies the active transactions that have not yet been committed to the database. Therefore, if the MDF file is corrupted, you will still be able to backup the most recent transactions.
Which of the option is used to take the log backup in case of data file crash?
There are three options for taking log backups:
1. Taking a full log backup
2. Taking a differential log backup
3. Taking a log backup with the truncate option
1. Taking a full log backup: This is the most basic way to take a log backup. A full log backup copies all the log records since the last full or differential backup. This option is useful when you want to restore the entire database to a point in time.
2. Taking a differential log backup: A differential log backup copies all the log records since the last full or differential backup. This option is useful when you want to restore the database to a point in time, but you don’t want to restore all the data.
3. Taking a log backup with the truncate option: This option copies all the log records since the last full or differential backup, and then truncates the log file. This option is useful when you want to reduce the size of the log file.
How can I backup MDF and LDF file in SQL Server?
Backing up your SQL Server databases is an important task that should be done frequently to protect your data. In this article we will show you how to backup your MDF and LDF files.
Backing up your MDF file is simple. You can use the T-SQL command BACKUP DATABASE to create a backup of your database. To backup your MDF file, run the following command:
BACKUP DATABASE MyDatabase TO DISK = ‘C:\MyBackup.bak’
The above command will backup the MyDatabase database to the C:\MyBackup.bak file.
Backing up your LDF file is a little more complicated. The LDF file contains transaction log data and must be backed up in a different way than the MDF file. You can use the T-SQL command BACKUP LOG to create a backup of your transaction logs. To backup your LDF file, run the following command:
BACKUP LOG MyDatabase TO DISK = ‘C:\MyBackup.trn’
The above command will backup the MyDatabase transaction logs to the C:\MyBackup.trn file.
How do I restore a database with Norecovery?
In the event of a system failure, you may need to restore a database from a backup. This document provides instructions on how to restore a database with Norecovery enabled.
To restore a database with Norecovery enabled, you will need to use the SQL Server Management Studio.
1. Open the SQL Server Management Studio.
2. In the Object Explorer pane, expand the Servers tree and then select the server on which you want to restore the database.
3. In the Connect to Server dialog box, enter the credentials for the server.
4. In the Object Explorer pane, expand the Databases tree and then select the database you want to restore.
5. In the right pane, right-click the database and then select Restore.
6. In the Restore Database dialog box, select the backup file you want to use to restore the database.
7. In the Restore Options section, select the Overwrite existing database check box.
8. In the Ready to Restore section, click the Restore button.
9. In the Restore Progress dialog box, click the Details tab.
10. In the Details tab, click the Show Script button.
11. In the Script Output pane, the following script will be generated:
USE [master]
GO
RESTORE DATABASE [database]
FROM DISK = N’\\server\path\to\backup.bak’
WITH REPLACE, NORECOVERY;
GO
12. Copy the code in the Script Output pane and paste it into a text editor.
13. Save the file as a .sql file.
14. In the Connect to Server dialog box, select the server on which you want to run the script.
15. In the Object Explorer pane, expand the Databases tree and then select the database you want to restore.
16. In the right pane, right-click the database and then select Script Database as > ALTER TO.
17. In the Script Database as > ALTER TO dialog box, enter the location of the .sql file you created in Step 13.
18. Click the OK button.
19. In the Object Explorer pane, right-click the database and then select Refresh.
20. In the right pane, right-click the database and then select Options.
21. In the Options dialog box, click the Recovery tab.
22. In the Recovery tab, make sure the Recovery mode is set to Full.
23. Click the OK button.
24. In the Object Explorer pane, right-click the database and then select Restart.
The database will be restored and will be in the Recovery mode.
What is differential data backup?
A differential data backup is a process that backs up only the data that has changed since the last full backup. This is a more efficient process than a full backup, because it requires less time and space.
A differential data backup can be created manually or automatically. It is typically stored on a different disk than the original data, so that it can be accessed quickly if needed.
The main advantage of a differential data backup is that it is faster and takes up less space than a full backup. It is also easier to restore data from a differential backup than from a full backup.
The main disadvantage of a differential data backup is that it is less reliable than a full backup. If the original data is lost or damaged, it can be difficult or impossible to restore the data from a differential backup.
