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Administration Reference

UNIX ulimit Settings
Describes user resources limits (i.e. ulimit) and introduces the considerations and optimal configurations for systems that run MongoDB deployments.
System Collections
Introduces the internal collections that MongoDB uses to track per-database metadata, including indexes, collections, and authentication credentials.
MongoDB Extended JSON
Describes the JSON super set used to express BSON documents in the mongo shell and other MongoDB tools.
Database Profiler Output
Describes the data collected by MongoDB’s operation profiler, which introspects operations and reports data for analysis on performance and behavior.
Journaling Mechanics
Describes the internal operation of MongoDB’s journaling facility and outlines how the journal allows MongoDB to provide provides durability and crash resiliency.
Exit Codes and Statuses
Lists the unique codes returned by mongos and mongod processes upon exit.