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dbStats

As explained in MongoDB 8.0 in Action, Third Edition

dbStats is a MongoDB command that returns size, data usage, index usage, and storage-efficiency statistics for a database.

dbStats is a MongoDB command for inspecting a database’s size, data usage, index usage, and storage efficiency. It supports operational monitoring and helps identify opportunities for storage or performance optimization. section 21.2.3

Use dbStats when you need to:

  • Review database-level resource use and storage efficiency. section 21.2.3
  • Support decisions about indexing, sharding, and other database optimizations alongside workload and collection diagnostics. section 21.2.3
  • Pair database-wide statistics with collStats for document counts, collection data size, index counts, and collection-level performance details. section 21.2.3

Run dbStats

Execute `db.runCommand({ dbStats: 1 })` to retrieve statistics for the current database. Use the result with other native diagnostic commands when investigating resource use or potential bottlenecks. section 21.2.3

db.runCommand({ dbStats: 1 })

Copyable shell syntax for requesting database statistics. section 21.2.3

How MongoDB 8.0 in Action, Third Edition covers it

How deep it goes
Defines database-level statistics and command syntax, but defers detailed fields and collection-level analysis to companion diagnostics.
Examples
Uses db.runCommand({ dbStats: 1 }) and contrasts it with db.runCommand({ collStats: "collection_name" }).
What you can do after
Apply it via the MongoDB shell to inspect database resource use and inform optimization decisions.
How it connects
Connects dbStats with collStats, indexing, sharding, and native MongoDB diagnostic commands.
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