For R4, the database limit is 1, 2 or 4 GB, which you set when you create the database.
For R5+, there is effectively no limit to the size of a database, the number of documents in a database or the number of documents you can import to a database. The database will get unwieldy and slow before you hit a hard limit.
For R5, there is a maximum size of 130 MB for a view index, but this depends on the complexity of the view, not just how many documents are in it.
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