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If the Mongo DB schema fails to migrate to the proper version during a Server Upgrade, the Mongo database is stuck in an in-between state and the Gallery won't start. The most likely issues that block the schema from updating can be identified by the Pre-Upgrade Checks workflow.
The procedures below allow you to run the Pre-Upgrade Checks workflow without the Gallery functioning by manually start the Mongo database.
1) Open a Command Prompt As Administrator
2) Start Mongo directly in the Command Prompt with the single-line command below. Adjust paths to mongod.exe and to the persistence folder set by Alteryx System Settings > Controller > Persistence > Data Folder