Microsoft SQL Server 2008 Administration for Oracle DBAs in Visual Studio .NET

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Microsoft SQL Server 2008 Administration for Oracle DBAs
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WITH STOPAT clause of the RESTORE statement to just overwrite the contents of the log Msg 3013, Level 16, State 1, Line 1 RESTORE DATABASE is terminating abnormally
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The message is telling you that you have not performed a tail-log backup and that your restore operation would result in losing any transactions currently contained within the transaction log that have not been backed up SQL Server then aborts the database restore If you are restoring to a previous point in time covered by the backup and have no interest in preserving the transactions within the log, then using the REPLACE option will override the message:
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RESTORE DATABASE AdventureWorks FROM DISK = 'AdventureWorks_Fullbak' WITH RECOVERY, REPLACE
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Checking Restore Integrity
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In the Backup section, we covered the use of CHECKSUM for verifying the integrity of the data pages as part of the backup process When performing a restore of a backup that used the CHECKSUM option, the default action is to re-verify the checksums on restore and, upon encountering any errors, to stop the restore process (STOP_ON_ ERROR is the default option) If you want the restore to continue through any errors, specifying CONTINUE_AFTER_ERROR will continue with the restore and report which pages contain errors at the end of the process The following restore will verify the backup checksums and will continue through any errors it finds:
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RESTORE DATABASE AdventureWorks FROM DISK = 'AdventureWorks_Fullbak' WITH RECOVERY, CHECKSUM, CONTINUE_AFTER_ERROR
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It is possible to disable checksum verification by specifying NO_CHECKSUM Also, if your backup did not use checksums and you specify that the restore should use the CHECKSUM feature, then the restore operation will fail and an error message will be displayed
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When restoring a database, you may not want users to be able to access the database as soon as you have brought it online, as you may need to perform other operations on
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7: Backup and Recovery
the database The RESTRICTED_USER option ensures that following a restore, only members of the sysadmin, db_owner, or dbcreator roles have access to the database:
RESTORE DATABASE AdventureWorks FROM DISK = 'AdventureWorks_Fullbak' WITH RECOVERY, RESTRICTED_USER
Restore Permissions
The fixed server role of sysadmin has all the required permissions to perform a database restore For administrative users who are not sysadmins, consider making them members of the dbcreator fixed server role This role is equivalent to granting the ALTER ANY DATABASE server permission and will allow a login to CREATE, DROP, and RESTORE any database on the instance Logins having only the CREATE ANY DATABASE permission can create new databases and RESTORE and DROP only their own databases All of the metadata reading operations, such as RESTORE LABELONLY and RESTORE FILELISTONLY, require the CREATE DATABASE permission
Restore History Tables
As with the backup history tables, all data relating to restore operations is stored within msdb Table 7-4 lists the restore tables with brief descriptions Using these tables, it is possible to write scripts to return details of any restore operations that have taken place on your database Following is a quick example of how to check what type of restore operations have taken place on the AdventureWorks database and when they were performed and by whom:
SELECT rhrestore_date, rhrestore_type, rhuser_name FROM msdbdborestorehistory rh WHERE rhdestination_database_name = 'AdventureWorks' ORDER BY rhrestore_history_id DESC
Table
dborestorehistory dborestorefilegroup dborestorefile Table 7-4 Restore-Related History Tables
Description
A row for each restore operation A row per restored filegroup A row per restored file
Microsoft SQL Server 2008 Administration for Oracle DBAs
This example query could be joined to other tables to provide full details of the restore such as the name of the file and whether or not it was restored to its original location Finally, when using tape devices, an additional DMV called sysdm_io_backup_tapes is available in the master database and will show the status of each tape device
Restoring System Databases
In the Backup section, we covered which of the system databases you should back up and which backup method to use The restore process for most of the system databases does not differ from that of restoring a standard user database To restore the model and msdb databases, you would use a standard database restore operation as we have shown in previous examples A point to note when attempting to restore msdb is to make sure that the SQL Server Agent service is stopped; otherwise, it will hold open a connection to the database, preventing it from being restored Restoring the master database is the exception The master database is fundamental to the operation of SQL Server and, as such, has a specific restore method If SQL Server is still operational, to restore the master database the server must be started in single-user mode Once SQL Server is up and running in single-user mode, a normal full restore and recovery of the database can take place If SQL Server has suffered a severe failure of the master database, and as such will not start, it is possible to perform a master database rebuild operation using the SQL Server setup media The rebuild operation replaces the damaged master database and also the model and msdb databases Once they are all rebuilt and SQL Server is able to start again, you can then attach the user databases or restore the databases using your last backup set
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