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.
Database Profiler Output: Describes the data collected by MongoDB’s operation profiler, which introspects operations and reports data for analysis on performance and behavior.
Server Status Output: Provides an example and a high level overview of the output of the serverStatus command.
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.

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