MongoDB compatibility and feature support with Azure Cosmos DB for MongoDB vCore

Article
06/11/2024

APPLIES TO: MongoDB vCore

Azure Cosmos DB for MongoDB vCore allows you to experience the familiar MongoDB advantages while accessing the enhanced enterprise features offered by Azure Cosmos DB. It ensures compatibility by following the MongoDB wire protocol, allowing you to leverage existing client drivers, SDKs and other tools you're already familiar with.

Protocol support

The supported operators and any limitations or exceptions are listed here. Any client driver that understands these protocols should be able to connect to Azure Cosmos DB for MongoDB. When you create Azure Cosmos DB for MongoDB vCore clusters, the endpoint is in the format *.mongocluster.cosmos.azure.com.

Query language support

Azure Cosmos DB for MongoDB provides comprehensive support for MongoDB query language constructs. Below you can find the detailed list of currently supported database commands, operators, stages, and options.

Note

This article only lists the supported server commands, and excludes client-side wrapper functions. Client-side wrapper functions such as deleteMany() and updateMany() internally utilize the delete() and update() server commands. Functions utilizing supported server commands are compatible with the Azure Cosmos DB for MongoDB.

Database commands

Azure Cosmos DB for MongoDB vCore supports the following database commands:

Category	Command	Feature
Category	Command	v5.0	v6.0	v7.0
Aggregation Commands	`aggregate`
	`count`
	`distinct`
	`mapReduce`	Deprecated in MongoDB 5.0
Authentication Commands	`authenticate`
	`getnonce`
	`logout`
Geospatial Commands	`geoSearch`	Deprecated in MongoDB 5.0
Query Plan Cache Commands
Administrative Commands	`cloneCollectionAsCapped`	No, capped collections are currently not supported.
	`collMod`
	`compact`
	`convertToCapped`	No. Capped collections are currently not supported.
	`create`
	`createIndexes`
	`currentOp`
	`drop`
	`dropDatabase`
	`dropConnections`	As a PaaS service, this will be managed by Azure.
	`dropIndexes`
	`filemd5`
	`fsync`	As a PaaS service, this will be managed by Azure.
	`fsyncUnlock`	As a PaaS service, this will be managed by Azure.
	`getDefaultRWConcern`
	`getClusterParameter`
	`getParameter`
	`killCursors`
	`killOp`
	`listCollections`
	`listDatabases`
	`listIndexes`
	`logRotate`	As a PaaS service, this will be managed by Azure.
	`reIndex`
	`renameCollection`
	`rotateCertificates`	As a PaaS service, this will be managed by Azure.
	`setFeatureCompatibilityVersion`	As a PaaS service, this will be managed by Azure.
	`setIndexCommitQuorum`
	`setParameter`
	`setDefaultRWConcern`
	`shutdown`	As a PaaS service, this will be managed by Azure.
User & Role Management Commands	Not supported today, but will be made available through Azure Active Directory in the future.
Replication Commands	Azure manages replication, removing the necessity for customers to replicate manually.
Sharding Commands	`enableSharding`
	`isdbgrid`
	`reshardCollection`
	`shardCollection`
	`unsetSharding`	Deprecated in MongoDB 5.0
	`addShard`	As a Platform-as-a-Service (PaaS) offering, Azure manages shard management and rebalancing. Users only need to specify the sharding strategy for the collections and Azure will handle the rest.
	`addShardToZone`
	`clearJumboFlag`
	`cleanupOrphaned`
	`removeShard`
	`removeShardFromZone`
	`setShardVersion`
	`mergeChunks`
	`checkShardingIndex`
	`getShardMap`
	`getShardVersion`
	`medianKey`
	`splitVector`
	`shardingState`
	`cleanupReshardCollection`
	`flushRouterConfig`
	`balancerCollectionStatus`
	`balancerStart`
	`balancerStatus`
	`balancerStop`
	`configureCollectionBalancing`
	`listShards`
	`split`
	`moveChunk`
	`updateZoneKeyRange`
	`movePrimary`
	`abortReshardCollection`
	`commitReshardCollection`
	`refineCollectionShardKey`
Query and Write Operation Commands	`change streams`
	`delete`
	`find`
	`findAndModify`
	`getLastError`
	`getMore`
	`insert`
	`resetError`	Deprecated in MongoDB 5.0
	`update`
Session Commands	`abortTransaction`
	`commitTransaction`
	`endSessions`
	`killAllSessions`
	`killAllSessionsByPattern`
	`killSessions`
	`refreshSessions`
	`startSession`
Diagnostic Commands	`availableQueryOptions`
	`buildInfo`
	`collStats`
	`connPoolStats`
	`connectionStatus`
	`dataSize`
	`dbHash`
	`dbStats`
	`driverOIDTest`	As a PaaS service, this will be managed by Azure.
	`explain`
	`features`	As a PaaS service, this will be managed by Azure.
	`getCmdLineOpts`
	`getLog`
	`hostInfo`
	`_isSelf`
	`listCommands`
	`lockInfo`
	`netstat`
	`ping`
	`profile`	As a PaaS service, this will be managed by Azure.
	`serverStatus`
	`shardConnPoolStats`	Deprecated in MongoDB 5.0
	`top`
	`validate`
	`whatsmyuri`
System Events Auditing Commands	`logApplicationMessage`

Operators

Below are the list of operators currently supported on Azure Cosmos DB for MongoDB vCore:

Note

The $lookup aggregation does not yet support using variable expressions using 'let'. AvgObjsize and size in "collStats" & "dbStats" works with document size less than 2KB only.

Category	Command	Feature
Category	Command	v5.0	v6.0	v7.0
Comparison Query Operators	`$eq`
	`$gt`
	`$gte`
	`$in`
	`$lt`
	`$lte`
	`$ne`
	`$nin`
Logical Query Operators	`$and`
	`$not`
	`$nor`
	`$or`
Element Query Operators	`$exists`
Element Query Operators	`$type`
Evaluation Query Operators	`$expr`
	`$jsonSchema`
	`$mod`
	`$regex`
	`$text`
	`$where`
Geospatial Operators	`$geoIntersects`	In Preview*
	`$geoWithin`
	`$box`
	`$center`
	`$centerSphere`
	`$geometry`
	`$maxDistance`
	`$minDistance`
	`$polygon`
	`$near`
	`$nearSphere`
Array Query Operators	`$all`
	`$elemMatch`
	`$size`
Bitwise Query Operators	`$bitsAllClear`
	`$bitsAllSet`
	`$bitsAnyClear`
	`$bitsAnySet`
Projection Operators	`$`
	`$elemMatch`
	`$meta`
	`$slice`
Miscellaneous Query Operators	`$comment`
	`$rand`
	`$natural`
Field Update Operators	`$currentDate`
	`$inc`
	`$min`
	`$max`
	`$mul`
	`$rename`
	`$set`
	`$setOnInsert`
	`$unset`
Array Update Operators	`$`
	`$[]`
	`$[identifier]`
	`$addToSet`
	`$pop`
	`$pull`
	`$push`
	`$pullAll`
	`$each`
	`$position`
	`$slice`
	`$sort`
Bitwise Update Operators	`$bit`
Arithmetic Expression Operators	`$abs`
	`$add`
	`$ceil`
	`$divide`
	`$exp`
	`$floor`
	`$ln`
	`$log`
	`$log10`
	`$mod`
	`$multiply`
	`$pow`
	`$round`
	`$sqrt`
	`$subtract`
	`$trunc`
Array Expression Operators	`$arrayElemAt`
	`$arrayToObject`
	`$concatArrays`
	`$filter`
	`$firstN`
	`$in`
	`$indexOfArray`
	`$isArray`
	`$lastN`
	`$map`
	`$maxN`
	`$minN`
	`$objectToArray`
	`$range`
	`$reduce`
	`$reverseArray`
	`$size`
	`$slice`
	`$sortArray`
	`$zip`
Bitwise Operators	`$bitAnd`
	`$bitNot`
	`$bitOr`
	`$bitXor`
Boolean Expression Operators	`$and`
	`$not`
	`$or`
Comparison Expression Operators	`$cmp`
	`$eq`
	`$gt`
	`$gte`
	`$lt`
	`$lte`
	`$ne`
Custom Aggregation Expression Operators	Not supported yet.
Data Size Operators	`$bsonSize`
Data Size Operators	`$binarySize`
Date Expression Operators	`$dateAdd`
	`$dateDiff`
	`$dateFromParts`
	`$dateFromString`
	`$dateSubtract`
	`$dateToParts`
	`$dateToString`
	`$dateTrunc`
	`$dayOfMonth`
	`$dayOfWeek`
	`$dayOfYear`
	`$hour`
	`$isoDayOfWeek`
	`$isoWeek`
	`$isoWeekYear`
	`$millisecond`
	`$minute`
	`$month`
	`$second`
	`$toDate`
	`$week`
	`$year`
Literal Expression Operator	`$literal`
Miscellaneous Operators	`$getField`
	`$rand`
	`$sampleRate`
Object Expression Operators	`$mergeObjects`
	`$objectToArray`
	`$setField`
Set Expression Operators	`$allElementsTrue`
	`$anyElementTrue`
	`$setDifference`
	`$setEquals`
	`$setIntersection`
	`$setIsSubset`
	`$setUnion`
String Expression Operators	`$concat`
	`$dateFromString`
	`$dateToString`
	`$indexOfBytes`
	`$indexOfCP`
	`$ltrim`
	`$regexFind`
	`$regexFindAll`
	`$regexMatch`
	`$replaceOne`
	`$replaceAll`
	`$rtrim`
	`$split`
	`$strLenBytes`
	`$strLenCP`
	`$strcasecmp`
	`$substr`
	`$substrBytes`
	`$substrCP`
	`$toLower`
	`$toString`
	`$trim`
	`$toUpper`
Text Expression Operator	`$meta`
Timestamp Expression Operators	`$tsIncrement`
Timestamp Expression Operators	`$tsSecond`
Trigonometry Expression Operators	Not supported yet.
Type Expression Operators	`$convert`
	`$isNumber`
	`$toBool`
	`$toDate`
	`$toDecimal`
	`$toDouble`
	`$toInt`
	`$toLong`
	`$toObjectId`
	`$toString`
	`$type`
Accumulators ($group, $bucket, $bucketAuto, $setWindowFields)	`$accumulator`
	`$addToSet`
	`$avg`
	`$bottom`
	`$bottomN`
	`$count`
	`$first`
	`$firstN`
	`$last`
	`$lastN`
	`$max`
	`$maxN`
	`$median`
	`$mergeObjects`
	`$min`
	`$percentile`
	`$push`
	`$stdDevPop`
	`$stdDevSamp`
	`$sum`
	`$top`
	`$topN`
Accumulators (in Other Stages)	`$avg`
	`$first`
	`$last`
	`$max`
	`$median`
	`$min`
	`$percentile`
	`$stdDevPop`
	`$stdDevSamp`
	`$sum`
Variable Expression Operators	Not supported yet.
Window Operators	Not supported yet.
Conditional Expression Operators	`$cond`
	`$ifNull`
	`$switch`
Aggregation Pipeline Stages	`$addFields`
	`$bucket`
	`$bucketAuto`
	`$changeStream`
	`$changeStreamSplitLargeEvent`
	`$collStats`
	`$count`
	`$densify`
	`$documents`
	`$facet`
	`$fill`
	`$geoNear`
	`$graphLookup`
	`$group`
	`$indexStats`
	`$limit`
	`$listSampledQueries`
	`$listSearchIndexes`
	`$listSessions`
	`$lookup`
	`$match`
	`$merge`
	`$out`
	`$planCacheStats`
	`$project`
	`$redact`
	`$replaceRoot`
	`$replaceWith`
	`$sample`
	`$search`
	`$searchMeta`
	`$set`
	`$setWindowFields`
	`$skip`
	`$sort`
	`$sortByCount`
	`$unionWith`
	`$unset`
	`$unwind`
	`$shardedDataDistribution`
	`$changeStream`
	`$currentOp`
	`$listLocalSessions`
	`$documents`
Variables in Aggregation Expressions	`NOW`
	`ROOT`
	`REMOVE`
	`CURRENT`
	`CLUSTER_TIME`
	`DESCEND`
	`PRUNE`
	`KEEP`
	`SEARCH_META`
	`USER_ROLES`

Indexes and index properties

Azure Cosmos DB for MongoDB vCore supports the following indexes and index properties:

Note

Creating a unique index obtains an exclusive lock on the collection for the entire duration of the build process. This blocks read and write operations on the collection until the operation is completed.

Indexes

Command	Supported
Single Field Index
Compound Index
Multikey Index
Text Index
Wildcard Index
Geospatial Index	In Preview*
Hashed Index
Vector Index (only available in Cosmos DB)	Yes, with vector search

Index properties

Command	Supported
TTL
Unique
Partial
Case Insensitive
Sparse
Background

Next steps

Migration options for Azure Cosmos DB for MongoDB vCore

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MongoDB compatibility and feature support with Azure Cosmos DB for MongoDB vCore

Protocol support

Query language support

Database commands

Operators

Indexes and index properties

Indexes

Index properties

Next steps

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