Patching SQL Server is an ongoing process. Service packs and cumulative updates are being regularly released, in order to apply possible bug fixes as well as provide additional functionality. This article, suggests a procedure for how to patch a standalone SQL Server instance.
First Patch SQL Server on the TEST Environment
First, always patch the respective SQL Server on the Test environment.
Here’s the suggested procedure:
- Plan ahead – inform application owners – get approvals
- Stop all application/services that connect to the SQL Server instance
- Backup server (OS)
- Backup all user databases
- Backup the system databases: master, model, msdb
- Backup the resource database via file system – copy files to a safe location (use the query in the appendix below to find resource database’s files location)
- Install patches
- Reboot server
- Make sure that SQL Server and related services are started
- Start application/services that connect to the SQL Server instance
- Certify that everything works well on the Test server after the installation of patches is completed.
- You need to get acceptance by all affected parties (i.e. IT users, application owners, etc.).
- If there is a problem, you will have to troubleshoot in order to resolve it
- In the unfortunate case where you cannot resolve the problem, as a last resort, you can follow a rollback procedure which involves the following but is not limited to:
- Uninstall the patch(es) previously installed
- Restore the system databases as well as the resource database (both data and log files)
- Reboot the server
- Check if everything is back to normal, that is the state of SQL Server just before the patching started
- If there is still a problem, restore server (OS) from the backup taken prior to start the process
- Check if all user databases are OK. If not, restore them from the backup taken prior to start the patching process.
- Check again if everything OK
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When to Proceed with Patching SQL Server on Production
If everything is OK on the TEST environment after the patching and you have the green light to proceed with patching Production (i.e. approvals/acceptance by business users/application owners, etc.), then you may follow the same steps as above for the Production standalone server (note: make sure you get approval for an adequate amount of downtime and also take into consideration possible unexpected problems during the patching process).
Tip: T-SQL Script to Find the Location of SQL Server Resource Database
By running the below T-SQL script, you can find the location of the Resource Database of your SQL Server instance(s).
USE master; GO SELECT 'ResourceDB' AS DBName , [name] AS DBFile, [filename] AS FilePath FROM sys.sysaltfiles WHERE dbid = 32767; GO
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Artemakis Artemiou is a Senior SQL Server Architect, Author, a 9 Times Microsoft Data Platform MVP (2009-2018) and a Udemy Instructor. He has over 15 years of experience in the IT industry in various roles. Artemakis is the founder of SQLNetHub and TechHowTos.com. Artemakis is the creator of the well-known software tools Snippets Generator and DBA Security Advisor. Also, he is the author of many eBooks on SQL Server. Artemakis currently serves as the President of the Cyprus .NET User Group (CDNUG) and the International .NET Association Country Leader for Cyprus (INETA). Moreover, Artemakis teaches on Udemy, you can check his courses here.