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iE:\LogShipFolder\scripts\SQL\" oE:\LogShipFolder\scripts\SQL\" errors
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objShell.Run("sqlcmd -S<STANDBYINSTANCENAME> -E & strDatabaseName & ".sql & strDatabaseName & "-results.txt")
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'Call subroutine to read the results file for RESTORE strFileNameResults="E:\LogShipFolder\scripts\SQL\" & & "-results.txt" Call CheckforErrors(strFileNameResults, strParentFolder, strDatabaseName) End If
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strDatabaseName
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End If Next objFile.Close SET objFile = NOTHING SET fso = NOTHING SET folder = NOTHING SET files = NOTHING SET objShell = NOTHING
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SET objFSO = NOTHING SET objMyFile = NOTHING 'SUBROUTINE - used to read the results of the SQLCMD query to check for 'errors Sub CheckforErrors(fileNameResults,parentFolder,databaseName) strFileNameResults=fileNameResults strParentFolder=parentFolder strDatabaseName=databaseName Const ForReading = 1 SET objShell = CreateObject("Wscript.Shell") Set objFSO = CreateObject("Scripting.FileSystemObject") Set objFile = objFSO.OpenTextFile(strFileNameResults, ForReading) strContents = objFile.ReadAll 'The value=0 means that it cannot find the phrase RESTORE LOG successfully 'processed and thus means an error If Instr(strContents,"RESTORE LOG successfully processed")=0 then objShell.Run(strParentFolder & "scripts\sendEmailSMTP.vbs " & strDatabaseName & " RESTORE ") End If objFile.Close Set objFSO=NOTHING Set objFile=NOTHING Set objShell=NOTHING End Sub
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The script accepts two parameters the folder containing the copied log backups and the database name. It iterates through the contents of the folder and retrieves the file extension of all the files in this case, TRN. It then checks for the DateCreated attribute of the file and compares it to the system date and time. If the value for the DateCreated attribute for the file differs in less than or equal to 15 minutes from the system date and time, it creates a SQL file containing the RESTORE LOG command for the database you ve passed as a parameter to the script. Notice how the script is dynamically generated, passing the filename of the retrieved log backup. After the SQL file has been generated, a call to the sqlcmd.exe utility is made, passing the filename of the SQL file generated as an input and generating an output file, which we ll use to send email alerts should the RESTORE LOG command fail. Because the script will be executed using the Windows Task Scheduler, we need something to send us email alerts for notification, as SQLMail and Database Mail are not available in SQL Server Express. The script calls another VBScript file, sendEmailSMTP.vbs, which accepts two parameters the database name and the job type, which in this case is a RESTORE job. Listing 6 shows the script for the sendEmailSMTP.vbs file. Make sure to change the SMTP server address and the recipient email address.
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The poor man s SQL Server log shipping
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Listing 6
VBScript file (sendEmailSMTP.vbs) sends email notifications
'Accept input parameters Dim databaseName Dim jobType 'first parameter databaseName= Wscript.Arguments.Item(0) 'second parameter jobType= Wscript.Arguments.Item(1) Set objMessage = CreateObject("CDO.Message") objMessage.Subject = "Message Alert from STANDBY SQL Server: " & databaseName & " " & jobType & " job failed" objMessage.From = "admin@domain.local" objMessage.To = "sqladmin@domain.local" objMessage.TextBody = "The " & databaseName & " " & jobType & " job running in the STANDBY SQL Server instance failed on " & Now() & vbCrLF & vbCrLf & "Please look at this problem ASAP " & vbCrlf & vbCrlf & vbCrlf & vbCrlf & "- The SQL Server Administrator/DBA -" 'This section provides the configuration information for the remote SMTP 'server.Normally you will only change the server name or IP. objMessage.Configuration.Fields.Item("http://schemas.microsoft.com/cdo/ configuration/sendusing") = 2 'Name or IP of Remote SMTP Server objMessage.Configuration.Fields.Item("http://schemas.microsoft.com/cdo/ configuration/smtpserver") = "smtp.domain.local" 'Server port number(typically 25) objMessage.Configuration.Fields.Item("http://schemas.microsoft.com/cdo/ configuration/smtpserverport") = 25 objMessage.Configuration.Fields.Update objMessage.Send Set objMessage = Nothing
After all the required scripts have been created, we ll use the same process we used in the primary server by creating a Scheduled Task that will call the logShipRobocopy.cmd batch file. This is the tricky part. You need to make sure that the batch file will execute after the log backup in the primary server is generated but before the new one starts. We must monitor this after implementation as the log backup time in the primary server may increase due to increased transactions, which means increased file size resulting in increased file transfer time. To illustrate, if we enabled log backups on the primary server to run every 15 minutes starting from 12:00 a.m., the log backups will be generated in 15-minute sequences: 12:00 a.m., 12:15 a.m., 12:30 a.m., and so on. On the standby server, the scheduled task to call the logShipRobocopy.cmd batch file should be scheduled to run every 15 minutes but after 12:00 a.m. To be safe, it should run in sequences that are two-thirds of the time sequences of the primary server, say 12:10 a.m. This would provide ample time for a medium-sized database with an average-to-high number of transactions to generate the log backups. Using a trial-and-error process to find the
Summary
appropriate timing, you could begin by setting 5 minutes for copying the log backups from the primary to the standby and to restoring them. To reiterate, when the log backup job runs on the primary server at 12:00 a.m., your Scheduled Task on the standby server should be scheduled to execute at 12:10 a.m. When you create the Scheduled Task, make sure that the domain account that you use has the appropriate rights to copy from the shared folder and dbo or dbcreator privileges to restore the log backups. You also need to take into account password changes on the account, as changes will cause the jobs on the primary and standby servers to fail. Note that all the scripts used in the entire process are interdependent. Changing the frequency of the transaction log backups would mean changing the VBScript file that reads the DateCreated attribute of the log backup file to reflect that interval. It also means changing the frequency of the Scheduled Task created on the standby server. Overall, understanding the entire process will give you the flexibility to modify parameters used in all the scripts.
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