Welcome to the sixth in a series of blog posts covering performance best practices for MongoDB. In this series, we are covering key considerations for achieving performance at scale across a number of important dimensions, including: Data modeling and sizing memory (the working set) Query patterns and profiling Indexing Sharding Transactions and read/write concerns Hardware and OS configuration, w
$cmdA virtual collection that exposes MongoDB's database commands. To use database commands, see Issue Commands._idA field required in every MongoDB document. The _id field must have a unique value. You can think of the _id field as the document's primary key. If you create a new document without an _id field, MongoDB automatically creates the field and assigns a unique BSON ObjectId to the field.
Monitoring is a critical component of all database administration. A firm grasp of MongoDB's reporting will allow you to assess the state of your database and maintain your deployment without crisis. Additionally, a sense of MongoDB's normal operational parameters will allow you to diagnose problems before they escalate to failures. This document presents an overview of the available monitoring ut
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