Sometimes you’ll run MongoSluice but there may be an error. To help troubleshoot, start with this question: Did MongoSluice complete the data interrogation and generate a schema?
Open MongoSluice and go to ‘bin; and look for something like jsonGraph_JobId1.json. If the file is not there, you ran into a connection error. However, if this file is there, then you know that MongoSluice ripped through the documents and created the schema. If you are running into another error, it might have something to do with streaming the data to SQL.