Question

Point out the correct statement.

(a) The local database supports sharded cluster operation

(b) The config database is a dependable API, and users should not write data to the config database in the course of normal operation or maintenance

(c) Modification of the config database on a functioning system may lead to instability or inconsistent data sets

(d) All of the mentioned

The question was posed to me during an interview.

This interesting question is from Cluster Deployment in division Sharding Concepts, Mechanics and Sharded Cluster of MongoDB

Answer 1

Right option is (c) Modification of the config database on a functioning system may lead to instability or inconsistent data sets

The explanation is: If you must modify the config database, use mongodump to create a full backup of the config database.