Installing SP3 has always been a highly debated issue.
We are going to break it down for you, and if anything goes wrong, you're already in the right place.
Besides keeping antivirus and a firewall updated and running (Windows Firewall works fine, by the way), keeping your system updated with Windows Updates is also important.
If information on this page needs a revision or expanded, please feel free to comment below.Please refer to Question 3 if you need a non-security hotfix for SP4 to address your issue.The SQL Server 2012 SP4 installation may require reboot post installation.If such discoveries were made for SQL Server 2012 Service Pack 3, then yes, GDRs would be released up to 12 months after SP4 release (10/4/2018). We recommend you contact Microsoft Support Services to get assistance and find a solution to your problem.You might be asked to upgrade to SP4 as part of troubleshooting.SQL Server Product Team is excited to bring you the final release of SQL Server 2012 Service Packs, Service Pack 4 (SP4).