New features of MongoDB 6.0

MongoDB 6.0 provides the following new features and optimizations:

• New features

  • Queryable encryption

  • Cluster-to-Cluster Sync

• Optimizations

  • Time series collections

  • Change streams

  • Aggregation

  • Queries

  • Elasticity

  • Security

Queryable encryption provides the following features:

• Encrypts sensitive data from the client side and allows only the client to obtain the encryption key.

• Encrypts data throughout the entire data lifecycle, which includes data transmission, storage, usage, auditing, and backup.

• Allows the client to run expressive queries on encrypted data, including equality, range, prefix, suffix, and substring queries.

• Protects data. Only applications that are authorized to access the client and users who have the permissions to access the encryption key can obtain the data in plaintext.

• Allows lightweight application development. Queryable encryption provides a comprehensive encryption solution that eliminates the concerns about data security and compliance for developers.

• Reduces security concerns for Alibaba Cloud users who want to store sensitive data.

The mongosync tool is introduced in MongoDB 6.0 to provide you with continuous and uni-directional data synchronization between ApsaraDB for MongoDB instances. The mongosync tool allows you to manage and monitor the synchronization process in real time. In the process, you can start, stop, resume, or reverse the synchronization task.

Time series collection is a new feature released in MongoDB 5.0. This feature is mainly used to perform time series data analytics. Since its release, the feature has been continuously updated. The following table describes the feature update records.

The following table describes the update records of the change stream feature.

The aggregation feature allows you to process multiple documents to return calculation results. You can use multiple operators in a single aggregation pipeline to create a complex data processing pipeline to retrieve and analyze data. MongoDB 6.0 provides the following optimizations to the aggregation feature:

• Supports $lookup and $graphLookup for sharded cluster instances.

• Improves the support of $lookup for joins.

• Improves the support of $graphLookup for graph traversal.

• Achieves up to a hundredfold improvement in the performance of $lookup.

Operators such as $maxN, $topN, $minN, $bottomN, $lastN, and $sortArray are added. Operators allow you to use databases for computing to reduce the burden on business applications.

MongoDB 6.0 provides the following new features and optimizations to improve elasticity:

• Updates the default size of a data chunk from 64 MB to 128 MB. This reduces data migration frequency and decreases networking and routing overheads.

• Supports the configureCollectionBalancing command that provides the following features:

  • Supports different chunk sizes for different sharded tables.

    For example, you can set the chunk size to 256 MB for ultra-large sharded tables and set the chunk size to 64 MB or 32 MB for small sharded tables that require even data distribution.

  • Supports the automatic defragmentation of sharded collections.

    You can run the configureCollectionBalancing command to configure automatic defragmentation. After you complete configurations, you no longer need to run the compact command to manage disk fragments. This reduces disk space usage.

  Note

  For more information about the configureCollectionBalancing command, see configureCollectionBalancing.

MongoDB 6.0 optimizes the Client-Side Field Level Encryption (CSFLE) feature. After the optimization, CSFLE is available for Key Management Interoperability Protocol (KMIP)-compliant key providers. In other words, in addition to local Keyfile-based key management services, MongoDB also supports third-party key management devices by using KMIP. This provides enhanced security.