How to reduce the size of records in MongoDB?

Question

MongoDB

By default, MongoDB reserves 16 MB for each record, which makes it difficult when there are millions of such records.
How can I set the record size for a certain database or collection or make it not fixed, but expandable.

Answer 1

docs.mongodb.org/manual/core/storage/#record-alloc...
in particular, the compact and repair commands should remove padding by default.