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I'm considering learning and using MongoDB for a project, but I'm going to need to be able to store at least 1024 columns for the first part, and as many as 1048577 for the second. Does MongoDB have a limit on the number of columns?

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This depends of name space or the storage for each name of each field, MongoDB by default only available 16mb for each documents, including name space (field in documents, database name, collection name)

Read this: limits namespaces

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