Change instance level collation of SQL Server using powershell - sql-server

Question

I want to change the collation of SQL Server instance programmatically using powershell script. Followings are the manual steps:
Stop the SQL Server instance
Go to directory location: "C:\Program Files\Microsoft SQL Server\MSSQL14.SQL2017\MSSQL\Binn"
Execute following command: sqlservr -c -m -T4022 -T3659 -s"SQL2017" -q"SQL_Latin1_General_CP1_CI_AS"
After the execution of the above command, following message displayed: "The default collation was successfully changed."
Then I need to press ctrl+c to stop further execution. How can I do
this programmatically?

Answer 1

When we execute the command to change the SQL Server Collation, it logs the execution details in event viewer application logs. Using loop we can check the event viewer application logs for SqlServr.exe continuously, and when it generates the following log message: "The default collation was successfully changed", we can kill the process.
#Take the time stamp before execution of Collation Change Command
$StartDateTime=(Get-Date).AddMinutes(-1)
# Execute the Collation Change Process
Write-Host "Executing SQL Server Collation Change Command"
$CollationChangeProcess=Start-Process -FilePath $SQLRootDirectory -ArgumentList
"-c -m -T 4022 -T 3659 -s $JustServerInstanceName -q $NewCollationName" -
NoNewWindow -passthru
Do
{
$log=Get-WinEvent -FilterHashtable #{logname='application';
providername=$SQLServiceName; starttime = $StartDateTime} | Where-Object -
Property Message -Match 'The default collation was successfully changed.'
IF($log.count -gt 0 -and $log.TimeCreated -gt $StartDateTime )
{
Stop-Process -ID $CollationChangeProcess.ID
write-host 'Collation Change Process Completed Successfully.'
break
}
$DateTimeNow=(Get-Date)
$Duration=$DateTimeNow-$StartDateTime
write-host $Duration.totalminutes
Start-Sleep -Seconds 2
IF ($Duration.totalminutes -gt 2)
{
write-host 'Collation Change Process Failed.'
break
}
}while (1 -eq 1)

Answer 2

Thanks #Murali Dhar Darshan. I've made some changes to your solution to make it easier to use. (I don't have high enough reputation to add this as a comment to your answer).
# Params
$NewCollationName="Danish_Norwegian_CI_AS"
$SQLRootDirectory="C:\Program Files\Microsoft SQL Server\MSSQL15.MSSQLSERVER\MSSQL\Binn\sqlservr.exe"
$SQLServiceName="MSSQLSERVER"
# Stop running SQL instance
net stop $SQLServiceName
#Take the time stamp before execution of Collation Change Command
$StartDateTime=(Get-Date).AddMinutes(-1)
# Execute the Collation Change Process
Write-Host "Executing SQL Server Collation Change Command"
$CollationChangeProcess=Start-Process -FilePath $SQLRootDirectory -ArgumentList "-c -m -T 4022 -T 3659 -q $NewCollationName" -NoNewWindow -passthru
Do
{
$log=Get-WinEvent -FilterHashtable #{logname='application';
providername=$SQLServiceName; starttime = $StartDateTime} | Where-Object -Property Message -Match 'The default collation was successfully changed.'
IF($log.count -gt 0 -and $log.TimeCreated -gt $StartDateTime )
{
Stop-Process -ID $CollationChangeProcess.ID
write-host 'Collation Change Process Completed Successfully.'
# Start SQL instance again
net start $SQLServiceName
break
}
$DateTimeNow=(Get-Date)
$Duration=$DateTimeNow-$StartDateTime
write-host $Duration.totalminutes
Start-Sleep -Seconds 2
IF ($Duration.totalminutes -gt 2)
{
write-host 'Collation Change Process Failed.'
Stop-Process -ID $CollationChangeProcess.ID
break
}
}while (1 -eq 1)