Sitecore Fix 9.x instance does not come back up

Today I faced the problem that my local Sitecore 9.x instance does not come back up.

No errors in the log and it ends near a line about “Device Detection”… After a lengthy investigation, I deleted the file “DeviceDetectionDB-200113120345-2D42A43B32A055B9A54DFFACE61FF39B.db” in the folder “/App_Data/DeviceDetection”. There is a nifty tool called“Lock Hunter” that allows you to delete the file while it is in use.

I terminated the w3wp process, reloaded the page and (a miracle happens) the instance is running again!

It appears that the January 2020 database file is corrupted.

Happy Sitecoring
Dirk

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