If SQL Server Errorlog does not show most recent data, chances are your service account has issues. In this case, the instance could not open its systems database “model”, which caused it to stop.Ī case of corruption (on my test system) is shown here.Īnother test case stating master db itself has corruption (logical consistency-based I/O error) Or an example during my tests, this is the message in the error log.
After these issues had been fixed, the instance started normally and ran stable like before.
It turned out this instance had issues getting to its LUN on the SAN. The Error message we found in production is shown below. The SQL Server Configuration Manager will point to the errorlog file used by your instance: The SQL Server Errorlog will be your first resource to figure out what is going wrong. Typically you need to restore or rebuild master database when the instance no longer starts and performs an automatic shutdown after your command to start up the instance or in the case someone has messed up the objects you have put in master against the previous advice. When should you restore or rebuild the master database? Read about the restrictions for master database in the restrictions section of the documentation. See the images below to see that while we can change the recovery model, it does not help us. On top of that, you can put master in Full recovery model, but you will not be able to create log backups for it. You can create and use tables etc., just like in any user database, but keep in mind this database has a special role when it comes to SQL Server. …”Īlso read the recommendations in that document. This includes instance-wide metadata such as logon accounts, endpoints, linked servers, and system configuration settings. The Microsoft Docs state: “ The master database records all the system-level information for a SQL Server system. The master databaseįirst of all, I want to remind you to not implement any critical objects in the master database, as it is a systems database for SQL Server itself. By cheer luck, the glitch vanished in time and the instance picked up its workings, so we double checked it all and didn’t need the actual recoveries to be performed. We reached out for the appropriate scenarios to recover the instance. Most articles cover restoring a master database on a local instance, if you’re lucky for a named instance, but most do not cover a clustered instance.Īs with everything in SQL Server, things evolve over time and versions! So, with every new version you prepare for, you also need to re-evaluate the scenarios you already tested for your current SQL Server instances.Īs we recently experienced a production instance that lost the ability to reach its SAN hosted database files, due to a glitch of the SAN backup mechanism. It doesn’t happen often you have to recover systems databases in SQL Server.
0 kommentar(er)
