Go to Admin -> Databases, and click the Add database button. For more info, check out our troubleshooting guide.

And while the sampling does a pretty good job keeping Metabase up to date, it can also mean that new fields can sometimes fall through the cracks, leading to visualization issues, or even fields failing to appear in your results. The reason Metabase only scans a sample of the documents is because scanning every document in every collection on every sync would be put too much strain on your database. This sampling helps Metabase do things like differentiate datetime fields from string fields, and provide people with pre-populated filters. To get a sense of the schema, Metabase will scan the first ten thousand documents of each collection in your MongoDB.

How Metabase syncs data in MongoDBīecause MongoDB contains unstructured data, Metabase takes a different approach to syncing your database’s metadata. Metabase supports MongoDB version 4.2 or higher.