With the introduction of DDS 4.2 Version following partial features from MongoDB 4.2 will be compatible.
MongoDB compatibility:
With the introduction of DDS 4.2 Version following partial features from MongoDB 4.2 will be compatible.
MongoDB compatibility:
Feature Category | Feature Details | DDS 4.0 | DDS 4.2 | Community edition MongoDB 4.2 |
Database Commands | The find command supports the allowDiskUse field, which allows MongoDB to use temporary files on disk to store data that exceeds the memory limit when processing non-indexed sort operations. |
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New syntax and usage of projection, such as |
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Distributed transaction | Supports distributed transaction functions. Distributed transactions are multi-document transactions on sharded clusters and replica sets. Starting with MongoDB 4.2, multi-document transactions. (whether on a sharded cluster or replica set) Also known as distributed transactions. |
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Remove the 16 MB limit for the total size of a transaction. |
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Drivers supporting version 4.2 must be used. |
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agglomerated | The aggregation capability is improved and data can be updated in the aggregation pipeline. |
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Wildcard Index | Supports wildcard indexing. |
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Sharded cluster | Allows you to modify the shard key value of the cluster document. |
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Adjust the fields associated with the shard key. |
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A collection can be sharded using a composite shard key with a single hash field. |
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The length limit of the key is removed from 512 bytes. |
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Multi-document transactions allow the creation of indexes and collections (non-distributed transactions) to be performed. |
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Index | Remove the restriction on the length of the index field. |
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The length limit for index names is removed. |
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Composite indexes can contain hash indexes. |
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Supports the function of hiding indexes for commissioning. |
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Collection namespace limit. |
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Other Optimized Features | Default Read and Write Concern |
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Supports jumbo chunk migration. |
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Hedge query is supported. |
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Mongos supports the javascripts function to support. |
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Further information can be found in the Document Database Service (DDS) Help Center.
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