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Release Notes for MongoDB 8.0 (Release Candidate)
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Important
MongoDB 8.0 Release Candidates
MongoDB 8.0 binaries are currently available only as release candidates. Release candidates can be used for early testing of new features, but are not suitable for production deployments.
This version of the manual is for an upcoming release and is currently a work in progress.
This page describes changes and new features introduced in MongoDB 8.0.
MongoDB 8.0 is a Major Release, which means that it is supported for both MongoDB Atlas and on-premises deployments. MongoDB 8.0 includes changes introduced in MongoDB Rapid Releases 7.1, 7.2, and 7.3. To see changes introduced in these rapid releases, see Changes Introduced in 7.X-Series Rapid Releases.
To learn more about the differences between Major and Rapid releases, see MongoDB Versioning.
General Changes
Compaction Improvements
Background Compaction
Starting in MongoDB 8.0, you can use the new autoCompact command
to perform background compaction. If enabled, the server attempts to keep free
space within each collection and index below the specified the
freeSpaceTargetMB value.
dryRun Option
If enabled, the compact command returns an estimate of how much space, in
bytes, compaction can reclaim from the targeted collection. If you run
compact with dryRun set to true, MongoDB only returns the estimated
value and does not perform any kind of compaction.
New Bulk Write Command
Starting in MongoDB 8.0, you can use the new bulkWrite
command to perform many insert, update, and delete operations on
multiple collections in one request. The existing
db.collection.bulkWrite() method only allows you to modify one
collection in one request.
Changes Introduced in 7.X-Series Rapid Releases
MongoDB 8.0 includes changes and features from the following Rapid Release versions:
Upgrade Procedures
Important
Feature Compatibility Version
To upgrade to MongoDB 8.0 from a 7.0 deployment, the 7.0 deployment
must have featureCompatibilityVersion set to 8.0. To check
the version:
db.adminCommand( { getParameter: 1, featureCompatibilityVersion: 1 } )
To upgrade to MongoDB 8.0, refer to the upgrade instructions specific to your MongoDB deployment:
If you need guidance on upgrading to 8.0, MongoDB professional services offer major version upgrade support to help ensure a smooth transition without interruption to your MongoDB application. To learn more, see MongoDB Consulting.
Download
To download MongoDB 8.0, go to the MongoDB Download Center.