Mongo特性 之 4.2

docker run --name mongo-4.2 -p 27017:27017 -d mongo:4.2

Distributed Transaction

• 4.0支持multi-document ACID transactions

• 4.2支持multi-document ACID transactions on sharded clusters

High Availablity

• 4.0支持Retryable Write

• 4.2支持Retryable Read

Wildcard Index

{ "userMetadata" : { "likes" : [ "dogs", "cats" ] } }
{ "userMetadata" : { "dislikes" : "pickles" } }
{ "userMetadata" : { "age" : 45 } }
{ "userMetadata" : "inactive" }

db.userData.createIndex( { "userMetadata.$**" : 1 } )

db.userData.find({ "userMetadata.likes" : "dogs" })
db.userData.find({ "userMetadata.dislikes" : "pickles" })
db.userData.find({ "userMetadata.age" : { $gt : 30 } })
db.userData.find({ "userMetadata" : "inactive" })

Full-Text Search

该功能只在Mongo Altas服务提供 Mongo Altas = Cloud-hosted MongoDB service on AWS, Azure, and GCP

How Atlas full-text search works

参考

• Release Notes for MongoDB 4.2

• 阿里云 MongoDB 4.2 重磅发布

• MongoDB 4.2 新特性解读