code 128 check digit c# Automating SQL Server Management using SMO in C#.NET

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Automating SQL Server Management using SMO
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code can then be executed every time your backup strategy calls for a full database backup of all databases on the target server. If you remove the full database backup logic from the code sample the code can be run every time transaction log backups are to be run for all databases on the server, improving your recovery interval to minimize the potential data loss in the event of a system failure. In the following script, shown in listing 2, we ll connect to our target server, and then get the default backup directory from the Settings collection. We ll next grab the database collection and iterate through that to do the backups. For each database we ll get the current date and time and put it into a string to use in the backup filename. We ll do the full backup for the database, then we ll check to see if the database recovery model is Simple. If not, we ll perform a transaction log backup on the database as well.
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Listing 2 Backing up user databases
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Action BackupSetDescription BackupSetName Database MediaDescription Devices BackupDevice AddDevice SqlBackup
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The SMO Backup object
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#backup.ps1 #Performs a Full backup followed by a transaction log backup on all user databases param ( [string]$srvname='MyServer\MyInstance' ) # Load SMO assembly, and if we're running SQL 2008 DLLs load the SMOExtended and SQLWMIManagement libraries $v = [System.Reflection.Assembly]::LoadWithPartialName ('Microsoft.SqlServer.SMO') $p = $v.FullName.Split(',') $p1 = $p[1].Split('=') $p2 = $p1[1].Split('.') if ($p2[0] -ne '9') { [System.Reflection.Assembly]::LoadWithPartialName('Microsoft.SqlServer. SMOExtended') | out-null [System.Reflection.Assembly]::LoadWithPartialName('Microsoft.SqlServer. SQLWMIManagement') | out-null } $s = new-object ('Microsoft.SqlServer.Management.Smo.Server') $srvname $bkdir = $s.Settings.BackupDirectory $dbs = $s.Databases foreach ($db in $dbs) { if ($db.IsSystemObject -eq $False -and $db.IsMirroringEnabled -eq $False)
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Restore
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$dbname = $db.Name $dt = get-date -format yyyyMMddHHmmss $bk = new-object ('Microsoft.SqlServer.Management.Smo.Backup') $bk.Action = 'Database' $bk.BackupSetDescription = "Full backup of " + $dbname $bk.BackupSetName = $dbname + " Backup" $bk.Database = $dbname $bk.MediaDescription = "Disk" $bk.Devices.AddDevice($bkdir + "\" + $dbname + "_db_" + $dt + ".bak", 'File') $bk.SqlBackup($s)
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# Simple Recovery Model has a Value Property of 3 # SQL Server 2008 doesn't recognize the enumerated value so the code is slightly different # Set a variable to run the transaction log backup, and if Simple, turn it off $trnbck = 1 if ($p2[0] -eq '9') { if ($db.DatabaseOptions.RecoveryModel -eq 'Simple') { $trnbck = 0 } } else { if ($db.RecoveryModel.value__ -eq 3) { $trnbck = 0 } } if ($trnbck -eq 1) { $dt = get-date -format yyyyMMddHHmmss $trn = new-object ('Microsoft.SqlServer.Management.Smo.Backup') $trn.Action = 'Log' $trn.BackupSetDescription = "Trans Log backup of " + $dbname $trn.BackupSetName = $dbname + " Backup" $trn.Database = $dbname $trn.MediaDescription = "Disk" $trn.Devices.AddDevice($bkdir + "\" + $dbname + "_tlog_" + $dt + ".trn", 'File') $trn.SqlBackup($s) } } }
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Restore
All the backups in the world don t do a bit of good if they can t be restored, and there are scenarios that require restores to be done. One is where a server or disk drive fails and the data needs to be recovered for business to continue. This is the primary reason we perform regular backups. For this case, the backup is restored (generally) to the same location where the original database files existed. In addition to this there may be the case where data is inadvertently modified or deleted, and some alternate recovery method is required, usually restoring the database backup to a new database name, so that the original data can be copied to the production database without disturbing other transactional activity occurring.
Automating SQL Server Management using SMO
Another use is for development and Quality Assurance (QA) testing, where a copy of the production database is restored in the development or QA environment to examine the effect of some application update. Finally, and this is often overlooked, database backups should be regularly tested in disaster recovery testing, to be certain that, should a problem occur, the backups are in fact usable. A valuable piece of information is available to us via SMO for the restore process that isn t available through Management Studio or through straight T-SQL, and that is the location of the default data and log file paths (figure 3). We can use this in our restore scenario, using the following objects. When we have this information, we can set the properties of the SMO Restore object (figure 4). We first connect to the server, then we create a BackupDeviceItem, specifying the name and path of the backup file we re going to use, and add that to the Devices collection of the Restore object. We need to create at least two RelocateFile objects (more if there are more logical files in the backup file) and add them to the RelocateFiles collection. These RelocateFile objects will allow us to specify both the LogicalFileName and the PhysicalFileName properties of the new database. In the PhysicalFileName properties, we ll use the MasterDBPath and MasterDBLogPath properties from the server information shown previously. Figure 4 shows the object hierarchy for the Restore object. As shown in listing 3, after we ve set the properties, we can invoke the SqlRestore method to perform the restore; then the restored database is available for use.
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