If you are a database administrator working with SQL Server, you may face situations when your production databases got corrupted by a hardware failure or malicious activity. There is a scenario when you need to restore a database in a disaster recovery situation without running the previous full backup since there are only differential backups available. The norecovery option allows you to restore and mount a damaged database without applying the full backup that precedes the most recent differential backup.
T Sql Restore Database With Norecovery
Restore database with norecovery is used to restore a database in SQL Server. This is the simplest way to restore the database, but it will delete all data from the restored database.
Restore Database with the Norecovery option means that the database is restored without a transaction log. This option requires that you have a full backup of the database. The Norecovery option is used to restore a database to its original state. The transaction log isn’t restored because the data in it has been deleted or modified since the backup was made. If you want to make changes to your database, use the Replace option instead.
Restore Database with Recovery Rollback Immediate means that when you restore a SQL Server database with this option, SQL Server rolls back any uncommitted transactions and then performs the restore operation. Use this option for an emergency recovery scenario if you need to recover from data loss without losing any committed transactions. For example, if you have lost all copies of your transaction log but have a good copy of your data file, you can use this option to recover your system without losing any committed changes (although there will be some redo records generated).
Restoring a database with no recovery is a quick operation. It does not require any transaction log files and the database can be opened immediately after the restore has completed. This method is suited for restoring databases when you want to get them back into service as soon as possible.
Restore Database In SQL Server W3schools
The SQL Server W3Schools site has a nice article on restoring databases. They have links to several useful resources, including this one: http://www.w3schools.com/sql/default.asp?q=restore_database
SQL Server Restore Database With NORECOVERY is a command to restore the database without taking backup. This can be useful in cases where you want to restore the database but not take a backup first, or if you want to use another backup file instead of the existing one.
Restore Database with NORECOVERY: Takes data from the current files and puts them into a new empty database. It does not use the existing log or partial backups. The new database will have no data in it (no user tables, indexes, or other objects). The format of each table is SQL Server 2008 (or later) style. You cannot use this option with an encrypted database.
SQL Database restore takes a long time.
Restoring a SQL Database in Azure SQL Database is easy, but it can take quite some time to complete. The default setting for the recovery model is simple. This means that all data will be overwritten, which can take a long time. In this article, we’ll show you how to restore your database with replace in Azure SQL Database and how to change the recovery model of your Azure SQL Database.
SQL Server W3Schools Introduction to Restore Database with Recovery Rollback Immediate
Restore database with recovery rollback immediate restores the database with no data loss and no transaction log replay from backup. When you issue this RESTORE command, SQL Server checks the backup chain and uses the most recent transaction log file as part of the restore process. If you do not specify an existing transaction log file during restore or if none was found in the backup chain, SQL Server creates one automatically during the process and starts logging transactions again immediately after restoring the database.
Restore with replace in Azure SQL Database
The restore operation will replace the target database with a new copy of the source database. The target database must be empty, or have all its data removed, before it can be restored. If you try to restore a database that contains data, the restore operation will fail.
You can use the WITH RECOVERY clause to restore a database from a backup into an existing database or into a new database. In this clause (available only for SQL Server), you specify whether you want to recover the database as part of your restore operation:
IMMEDIATE specifies that you want to recover the database immediately after restoring it. This is the default behavior if you don’t specify WITH RECOVERY.
REPLACE specifies that you want to drop and recreate the target database before restoring it from its backup file.
Restore database with replace in Azure SQL database
The restore database with replace command is used to restore a database from a backup. The database is restored with the same name, schema and other properties as the original database. If you are restoring a single file or transaction log, then you can use a T-SQL statement to perform the restore operation. You can also use the RESTORE DATABASE statement to restore one or more files that are part of a database backup.
The RESTORE DATABASE statement replaces an existing database with a newly restored copy of it. When you do this, all objects in the existing database are removed and replaced by objects in the new copy of the database. This includes all tables, views, stored procedures, user-defined functions and other data types that were present in the source database prior to its restoration using this method. Any changes made by users to objects in an existing database will be lost when you restore that database with replace.
Restore with replace is the easiest and fastest way to restore an Azure SQL Database. It replaces the existing database with a new one and makes it available for use right away. You can use this option when you have a backup of your Azure SQL Database and want to restore it quickly.
Restore with replace will fail if:
The restored database has the same name as the existing one.
There are any errors in the restored backup file.