How to store large JSON configs?

Question

MySQL

How best to organize the storage of JSON configs, given that
1. The number of Inserts and fetches of such rows in the database will be approximately the same
2. JSON configs are very large, can reach up to 2,000,000 characters
3. Each user has such configs
Interested in how to reduce the volume disk space occupied by configs to make it all work fast enough.

Answer 1

Alternatively, see arangodb.com and https://www.rethinkdb.com/

Answer 2

Is MongoDB the way out? Searchable by fields