[TOC]
- MongoDB官方文档中文版
- MongoDB用户手册
- MongoDB简介
- 安装 MongoDB
- 安装MongoDB社区版
- 安装MongoDB企业版
- 将社区版MongoDB升级到企业版MongoDB
- 验证MongoDB软件包的完整性
- Mongo Shell
- 增删改查操作
- 聚合
- 数据模式
- 数据建模介绍
- 模式验证
- Data Modeling Concepts
- Data Model Examples and Patterns
- Model Relationships Between Documents
- Model One-to-One Relationships with Embedded Documents
- Model One-to-Many Relationships with Embedded Documents
- Model One-to-Many Relationships with Document References
- Model Tree Structures
- Model Tree Structures with Parent References
- Model Tree Structures with Child References
- Model Tree Structures with an Array of Ancestors
- Model Tree Structures with Materialized Paths
- Model Tree Structures with Nested Sets
- Model Specific Application Contexts
- Model Data for Atomic Operations
- Model Data to Support Keyword Search
- Model Data for Schema Versioning
- Model Monetary Data
- Model Time Data
- Model Computed Data
- Data Model Reference
- 事务
- 索引
- Single Field Indexes
- Compound Indexes
- Multikey Indexes
- Text Indexes
- Wildcard Indexes
- 2dsphere Indexes
- 2d Indexes
- geoHaystack Indexes
- Hashed Indexes
- 索引特性
- Index Builds on Populated Collections
- 索引交集
- Manage Indexes
- 衡量索引使用
- Indexing Strategies
- Indexing Reference
- 2d索引
- 2dsphere索引
- 复合索引
- geoHaystack索引
- Hashed 索引
- 在填充的集合上建立索引
- 索引参考
- 索引策略
- 管理索引
- 多键索引
- 单字段索引
- 文本索引
- 通配符索引
- 安全
- 安全检查列表
- Enable Access Control
- 身份验证
- Users
- Add Users
- Authentication Mechanisms
- SCRAM
- x.509
- Enterprise Authentication Mechanisms
- Kerberos Authentication
- LDAP Proxy Authentication
- LDAP Authorization
- Internal/Membership Authentication
- Deploy Replica Set With Keyfile Authentication
- Update Replica Set to Keyfile Authentication
- Update Replica Set to Keyfile Authentication (No Downtime)
- Rotate Keys for Replica Sets
- Deploy Sharded Cluster with Keyfile Authentication
- Update Sharded Cluster to Keyfile Authentication
- Update Sharded Cluster to Keyfile Authentication (No Downtime)
- Rotate Keys for Sharded Clusters
- Use x.509 Certificate for Membership Authentication
- Upgrade from Keyfile Authentication to x.509 Authentication
- Rolling Update of x.509 Cluster Certificates that Contain New DN
- Role-Based Access Control
- TLS/SSL (Transport Encryption)
- Encryption at Rest
- Client-Side Field Level Encryption
- 审计
- Network and Configuration Hardening
- Implement Field Level Redaction
- Security Reference
- Create a Vulnerability Report
- Appendix
- 附录
- 启用访问控制
- 网络和配置强化
- 安全参考
- 改变流
- 复制集
- 复制集成员
- 副本集日志
- Replica Set Data Synchronization
- 副本集部署架构
- Replica Set High Availability
- Replica Set Read and Write Semantics
- Replica Set Deployment Tutorials
- Member Configuration Tutorials
- Replica Set Maintenance Tutorials
- Change the Size of the Oplog
- Perform Maintenance on Replica Set Members
- Force a Member to Become Primary
- Resync a Member of a Replica Set
- Configure Replica Set Tag Sets
- Reconfigure a Replica Set with Unavailable Members
- Manage Chained Replication
- Change Hostnames in a Replica Set
- Configure a Secondary’s Sync Target
- Replication Reference
- 副本集数据同步
- 分片
- 分片集群组成]
- 片键
- 哈希分片
- 范围分片
- 部署分片集群
- 区域
- Data Partitioning with Chunks
- Balancer
- Administration
- Config Server Administration
- Replace a Config Server
- View Cluster Configuration
- Restart a Sharded Cluster
- Migrate a Sharded Cluster to Different Hardware
- Add Shards to a Cluster
- Remove Shards from an Existing Sharded Cluster
- Clear jumbo Flag
- Back Up Cluster Metadata
- Convert Sharded Cluster to Replica Set
- Convert a Replica Set to a Sharded Cluster
- Convert a Shard Standalone to a Shard Replica Set
- Sharding Reference
- 分片键
- Zone
- 管理权限
- 产品说明
- Operations Checklist
- Development Checklist
- Performance
- 配置和维护
- Data Center Awareness
- MongoDB Backup Methods
- Back Up and Restore with Filesystem Snapshots
- Back Up and Restore with MongoDB Tools
- Restore a Replica Set from MongoDB Backups
- Backup and Restore Sharded Clusters
- Back Up a Sharded Cluster with File System Snapshots
- Back Up a Sharded Cluster with Database Dumps
- Schedule Backup Window for Sharded Clusters
- Restore a Sharded Cluster
- Recover a Standalone after an Unexpected Shutdown
- Monitoring for MongoDB
- 开发检查表
- MogoDB 备份方法
- 操作检查表
- MongoDB性能
- 存储
- 常见问题
- 参考
- Operators
- Query and Projection Operators
- Comparison Query Operators
- Logical Query Operators
- Element Query Operators
- Evaluation Query Operators
- Geospatial Query Operators
- Array Query Operators
- Bitwise Query Operators
- $comment
- 查询与映射运算符
- 更新运算符
- Field Update Operators
- Array Update Operators
- Bitwise Update Operator
- Aggregation Pipeline Stages
- $addFields (aggregation)
- $bucket (aggregation)
- $bucketAuto (aggregation)
- $collStats (aggregation)
- $count (aggregation)
- $currentOp (aggregation)
- $facet (aggregation)
- $geoNear (aggregation)
- $graphLookup (aggregation)
- $group (aggregation)
- $indexStats (aggregation)
- $limit (aggregation)
- $listLocalSessions
- $listSessions
- $lookup (aggregation)
- $match (aggregation)
- $merge (aggregation)
- $out (aggregation)
- $planCacheStats
- $project (aggregation)
- $redact (aggregation)
- $replaceRoot (aggregation)
- $replaceWith (aggregation)
- $sample (aggregation)
- $set (aggregation)
- $skip (aggregation)
- $sort (aggregation)
- $sortByCount (aggregation)
- $unionWith (aggregation)
- $unset (aggregation)
- $unwind (aggregation)
- Aggregation Pipeline Operators
- $sin (aggregation)
- $abs (aggregation)
- $slice (aggregation)
- $accumulator (aggregation)
- $split (aggregation)
- $acos (aggregation)
- $sqrt (aggregation)
- $acosh (aggregation)
- $add (aggregation)
- $addToSet (aggregation)
- $allElementsTrue (aggregation)
- $and (aggregation)
- $anyElementTrue (aggregation)
- $arrayElemAt (aggregation)
- $arrayToObject (aggregation)
- $asin (aggregation)
- $asinh (aggregation)
- $sum (aggregation)
- $atan (aggregation)
- $atan2 (aggregation)
- $tan (aggregation)
- $atanh (aggregation)
- $avg (aggregation)
- $binarySize (aggregation)
- $bsonSize (aggregation)
- $ceil (aggregation)
- $toInt (aggregation)
- $cmp (aggregation)
- $concat (aggregation)
- $concatArrays (aggregation)
- $cond (aggregation)
- $convert (aggregation)
- $cos (aggregation)
- $dateFromParts (aggregation)
- $dateToParts (aggregation)
- $type (aggregation)
- $dateFromString (aggregation)
- $week (aggregation)
- $dateToString (aggregation)
- $year (aggregation)
- $dayOfMonth (aggregation)
- $zip (aggregation)
- $dayOfWeek (aggregation)
- $dayOfYear (aggregation)
- $degreesToRadians (aggregation)
- $divide (aggregation)
- $eq (aggregation)
- $exp (aggregation)
- $filter (aggregation)
- $first (aggregation accumulator)
- $first (aggregation)
- $floor (aggregation)
- $function (aggregation)
- $gt (aggregation)
- $gte (aggregation)
- $hour (aggregation)
- $ifNull (aggregation)
- $in (aggregation)
- $indexOfArray (aggregation)
- $indexOfBytes (aggregation)
- $indexOfCP (aggregation)
- $isArray (aggregation)
- $isNumber (aggregation)
- $isoDayOfWeek (aggregation)
- $isoWeek (aggregation)
- $isoWeekYear (aggregation)
- $last (aggregation accumulator)
- $last (aggregation)
- $let (aggregation)
- $literal (aggregation)
- $ln (aggregation)
- $log (aggregation)
- $log10 (aggregation)
- $lt (aggregation)
- $lte (aggregation)
- $trim (aggregation)
- $map (aggregation)
- $max (aggregation)
- $mergeObjects (aggregation)
- $meta
- $min (aggregation)
- $millisecond (aggregation)
- $minute (aggregation)
- $mod (aggregation)
- $month (aggregation)
- $multiply (aggregation)
- $ne (aggregation)
- $not (aggregation)
- $objectToArray (aggregation)
- $or (aggregation)
- $pow (aggregation)
- $push (aggregation)
- $radiansToDegrees (aggregation)
- $range (aggregation)
- $reduce (aggregation)
- $regexFind (aggregation)
- $regexFindAll (aggregation)
- $regexMatch (aggregation)
- $replaceOne (aggregation)
- $replaceAll (aggregation)
- $reverseArray (aggregation)
- $round (aggregation)
- $rtrim (aggregation)
- $second (aggregation)
- $setDifference (aggregation)
- $setEquals (aggregation)
- $setIntersection (aggregation)
- $setIsSubset (aggregation)
- $setUnion (aggregation)
- $size (aggregation)
- $slice (aggregation)
- $split (aggregation)
- $sqrt (aggregation)
- $stdDevPop (aggregation)
- $stdDevSamp (aggregation)
- $strcasecmp (aggregation)
- $strLenBytes (aggregation)
- $strLenCP (aggregation)
- $substr (aggregation)
- $substrBytes (aggregation)
- $substrCP (aggregation)
- $subtract (aggregation)
- $sum (aggregation)
- $switch (aggregation)
- $tan (aggregation)
- $toBool (aggregation)
- $toDate (aggregation)
- $toDecimal (aggregation)
- $toDouble(aggregation)
- $toInt (aggregation)
- $toLong (aggregation)
- $toObjectId (aggregation)
- $toString (aggregation)
- $toLower (aggregation)
- $toUpper (aggregation)
- $trim (aggregation)
- $trunc (aggregation)
- $type (aggregation)
- $week (aggregation)
- $year (aggregation)
- $zip (aggregation)
- 查询修饰符
- $comment
- $explain
- $hint
- $max
- $maxTimeMS
- $min
- $orderby
- $query
- $returnKey
- $showDiskLoc
- $natural
- 聚合管道操作符
- $abs (aggregation)
- $acos (aggregation)
- $acosh (aggregation)
- $add (aggregation)
- $addToSet (aggregation)
- $and (aggregation)
- $anyElementTrue (aggregation)
- $arrayElemAt (aggregation)
- $arrayToObject (aggregation)
- $asin (aggregation)
- $asinh (aggregation)
- $atan (aggregation)
- $atan2 (aggregation)
- $atanh (aggregation)
- $avg (aggregation)
- $ceil (aggregation)
- $cmp (aggregation)
- $concat (aggregation)
- $concatArrays (aggregation)
- $cond (aggregation)
- $convert (aggregation)
- $cos (aggregation)
- $dateFromParts (aggregation)
- $dateFromString (aggregation)
- $dateToParts (aggregation)
- $dateToString (aggregation)
- $literal (aggregation)
- 聚合管道阶段
- 数据库命令
- Aggregation Commands
- aggregate
- count
- distinct
- mapReduce
- Geospatial Commands
- geoSearch
- Query and Write Operation Commands
- delete
- find
- findAndModify
- getLastError
- getMore
- insert
- resetError
- update
- 查询计划缓存命令
- planCacheClear
- planCacheClearFilters
- planCacheListFilters
- planCacheSetFilter
- 认证命令
- authenticate
- getnonce
- logout
- User Management Commands
- createUser
- dropAllUsersFromDatabase
- dropUser
- grantRolesToUser
- revokeRolesFromUser
- updateUser
- usersInfo
- Role Management Commands
- createRole
- dropRole
- dropAllRolesFromDatabase
- grantPrivilegesToRole
- grantRolesToRole
- invalidateUserCache
- revokePrivilegesFromRole
- revokeRolesFromRole
- rolesInfo
- updateRole
- Replication Commands
- applyOps
- isMaster
- replSetAbortPrimaryCatchUp
- replSetFreeze
- replSetGetConfig
- replSetGetStatus
- replSetInitiate
- replSetMaintenance
- replSetReconfig
- replSetResizeOplog
- replSetStepDown
- replSetSyncFrom
- Sharding Commands
- addShard
- addShardToZone
- balancerCollectionStatus
- balancerStart
- balancerStatus
- balancerStop
- checkShardingIndex
- clearJumboFlag
- cleanupOrphaned
- enableSharding
- flushRouterConfig
- getShardMap
- getShardVersion
- isdbgrid
- listShards
- medianKey
- moveChunk
- movePrimary
- mergeChunks
- refineCollectionShardKey
- removeShard
- removeShardFromZone
- setShardVersion
- shardCollection
- shardingState
- split
- splitChunk
- splitVector
- unsetSharding
- updateZoneKeyRange
- Sessions Commands
- abortTransaction
- commitTransaction
- endSessions
- killAllSessions
- killAllSessionsByPattern
- killSessions
- refreshSessions
- startSession
- Administration Commands
- cloneCollectionAsCapped
- collMod
- compact
- connPoolSync
- convertToCapped
- create
- createIndexes
- currentOp
- drop
- dropDatabase
- dropConnections
- dropIndexes
- filemd5
- fsync
- fsyncUnlock
- getDefaultRWConcern
- getParameter
- killCursors
- killOp
- listCollections
- listDatabases
- listIndexes
- logRotate
- reIndex
- renameCollection
- setFeatureCompatibilityVersion
- setIndexCommitQuorum
- setParameter
- setDefaultRWConcern
- shutdown
- Diagnostic Commands
- availableQueryOptions
- buildInfo
- collStats
- connPoolStats
- connectionStatus
- cursorInfo
- dataSize
- dbHash
- dbStats
- diagLogging
- driverOIDTest
- explain
- features
- getCmdLineOpts
- getLog
- hostInfo
- isSelf
- listCommands
- lockInfo
- netstat
- ping
- profile
- serverStatus
- shardConnPoolStats
- top
- validate
- whatsmyuri
- 免费监控命令
- getFreeMonitoringStatus
- setFreeMonitoring
- 数据库命令
- logApplicationMessage
- 管理命令
- 聚合命令
- 诊断命令
- 地理空间命令
- 查询和写操作命令
- 复制命令
- 角色管理命令
- 会话命令
- 分片命令
- 用户管理命令
- mongo Shell 方法
- Collection Methods
- db.collection.aggregate（）
- db.collection.bulkWrite（）
- db.collection.copyTo（）
- db.collection.count（）
- db.collection.countDocuments（）
- db.collection.estimatedDocumentCount（）
- db.collection.createIndex（）
- db.collection.createIndexes（）
- db.collection.dataSize（）
- db.collection.deleteOne（）
- db.collection.deleteMany（）
- db.collection.distinct（）
- db.collection.drop（）
- db.collection.dropIndex（）
- db.collection.dropIndexes（）
- db.collection.ensureIndex（）
- db.collection.explain（）
- db.collection.find（）
- db.collection.findAndModify（）
- db.collection.findOne（）
- db.collection.findOneAndDelete（）
- db.collection.findOneAndReplace（）
- db.collection.findOneAndUpdate（）
- db.collection.getIndexes（）
- db.collection.getShardDistribution（）
- db.collection.getShardVersion（）
- db.collection.hideIndex()
- db.collection.insert（）
- db.collection.insertOne（）
- db.collection.insertMany（）
- db.collection.isCapped（）
- db.collection.latencyStats（）
- db.collection.mapReduce（）
- db.collection.reIndex（）
- db.collection.remove（）
- db.collection.renameCollection（）
- db.collection.replaceOne（）
- db.collection.save（）
- db.collection.stats（）
- db.collection.storageSize（）
- db.collection.totalIndexSize（）
- db.collection.totalSize（）
- db.collection.unhideIndex()
- db.collection.update（）
- db.collection.updateOne（）
- db.collection.updateMany（）
- db.collection.watch（）
- db.collection.validate（）
- Cursor Methods
- cursor.addOption()
- cursor.allowDiskUse()
- cursor.allowPartialResults()
- cursor.batchSize()
- cursor.close()
- cursor.isClosed()
- cursor.collation()
- cursor.comment()
- cursor.count()
- cursor.explain()
- cursor.forEach()
- cursor.hasNext()
- cursor.hint()
- cursor.isExhausted()
- cursor.itcount()
- cursor.limit()
- cursor.map()
- cursor.max()
- cursor.maxTimeMS()
- cursor.min()
- cursor.next()
- cursor.noCursorTimeout()
- cursor.objsLeftInBatch()
- cursor.pretty()
- cursor.readConcern()
- cursor.readPref()
- cursor.returnKey()
- cursor.showRecordId()
- cursor.size()
- cursor.skip()
- cursor.sort()
- cursor.tailable()
- cursor.toArray()
- Database Methods
- db.adminCommand()
- db.aggregate()
- db.cloneDatabase()
- db.commandHelp()
- db.copyDatabase()
- db.createCollection()
- db.createView()
- db.currentOp()
- db.dropDatabase()
- db.eval()
- db.fsyncLock()
- db.fsyncUnlock()
- db.getCollection()
- db.getCollectionInfos()
- db.getCollectionNames()
- db.getLastError()
- db.getLastErrorObj()
- db.getLogComponents()
- db.getMongo()
- db.getName()
- db.getProfilingLevel()
- db.getProfilingStatus()
- db.getReplicationInfo()
- db.getSiblingDB()
- db.help()
- db.hostInfo()
- db.isMaster()
- db.killOp()
- db.listCommands()
- db.logout()
- db.printCollectionStats()
- db.printReplicationInfo()
- db.printShardingStatus()
- db.printSlaveReplicationInfo()
- db.resetError()
- db.runCommand()
- db.serverBuildInfo()
- db.serverCmdLineOpts()
- db.serverStatus()
- db.setLogLevel()
- db.setProfilingLevel()
- db.shutdownServer()
- db.stats()
- db.version()
- db.watch()
- Query Plan Cache Methods
- db.collection.getPlanCache()
- PlanCache.clear()
- PlanCache.clearPlansByQuery()
- PlanCache.help()
- PlanCache.list()
- Bulk Operation Methods
- db.collection.initializeOrderedBulkOp()
- db.collection.initializeUnorderedBulkOp()
- Bulk()
- Bulk.execute()
- Bulk.find()
- Bulk.find.arrayFilters()
- Bulk.find.collation()
- Bulk.find.hint()
- Bulk.find.remove()
- Bulk.find.removeOne()
- Bulk.find.replaceOne()
- Bulk.find.updateOne()
- Bulk.find.update()
- Bulk.find.upsert()
- Bulk.getOperations()
- Bulk.insert()
- Bulk.tojson()
- Bulk.toString()
- User Management Methods
- db.auth()
- db.changeUserPassword()
- db.createUser()
- db.dropUser()
- db.dropAllUsers()
- db.getUser()
- db.getUsers()
- db.grantRolesToUser()
- db.removeUser()
- db.revokeRolesFromUser()
- db.updateUser()
- passwordPrompt()
- Role Management Methods
- db.createRole()
- db.dropRole()
- db.dropAllRoles()
- db.getRole()
- db.getRoles()
- db.grantPrivilegesToRole()
- db.revokePrivilegesFromRole()
- db.grantRolesToRole()
- db.revokeRolesFromRole()
- db.updateRole()
- Replication Methods
- rs.add()
- rs.addArb()
- rs.conf()
- rs.freeze()
- rs.help()
- rs.initiate()
- rs.printReplicationInfo()
- rs.printSlaveReplicationInfo()
- rs.reconfig()
- rs.remove()
- rs.status()
- rs.stepDown()
- rs.syncFrom()
- Sharding Methods
- sh.addShard()
- sh.addShardTag()
- sh.addShardToZone()
- sh.addTagRange()
- sh.balancerCollectionStatus()
- sh.disableBalancing()
- sh.enableBalancing()
- sh.disableAutoSplit
- sh.enableAutoSplit
- sh.enableSharding()
- sh.getBalancerHost()
- sh.getBalancerState()
- sh.removeTagRange()
- sh.removeRangeFromZone()
- sh.help()
- sh.isBalancerRunning()
- sh.moveChunk()
- sh.removeShardTag()
- sh.removeShardFromZone()
- sh.setBalancerState()
- sh.shardCollection()
- sh.splitAt()
- sh.splitFind()
- sh.startBalancer()
- sh.status()
- sh.stopBalancer()
- sh.waitForBalancer()
- sh.waitForBalancerOff()
- sh.waitForPingChange()
- sh.updateZoneKeyRange()
- convertShardKeyToHashed
- Free Monitoring Methods
- db.disableFreeMonitoring()
- db.enableFreeMonitoring()
- db.getFreeMonitoringStatus
- Object Constructors and Methods
- BulkWriteResult()
- Date()
- ObjectId
- ObjectId.getTimestamp()
- ObjectId.toString()
- ObjectId.valueOf()
- UUID()
- WriteResult()
- WriteResult.hasWriteError()
- WriteResult.hasWriteConcernError()
- Connection Methods
- connect()
- Mongo()
- Mongo.getDB()
- Mongo.getReadPrefMode()
- Mongo.getReadPrefTagSet()
- Mongo.isCausalConsistency()
- Mongo.setCausalConsistency()
- Mongo.setReadPref()
- Mongo.startSession()
- Mongo.watch()
- Session
- SessionOptions
- Native Methods
- cat()
- cd()
- copyDbpath()
- getHostName()
- getMemInfo()
- hostname()
- isInteractive()
- listFiles()
- load()
- ls()
- md5sumFile()
- mkdir()
- pwd()
- quit()
- removeFile()
- resetDbpath()
- sleep()
- setVerboseShell()
- version()
- _isWindows()
- _rand()
- Client-Side Field Level Encryption Methods
- getKeyVault()
- KeyVault.createKey()
- KeyVault.deleteKey()
- KeyVault.getKey()
- KeyVault.getKeys()
- KeyVault.addKeyAlternateName()
- KeyVault.removeKeyAlternateName()
- KeyVault.getKeyByAltName()
- getClientEncryption()
- ClientEncryption.encrypt()
- ClientEncryption.decrypt()
- mongo Shell 方法
- MongoDB Package Components
- Configuration File Options
- MongoDB Server Parameters
- MongoDB Limits and Thresholds
- Explain Results
- System Collections
- 连接字符串URI格式
- 排序
- MongoDB的Wire协议
- 日志消息
- Exit Codes and Statuses
- 词汇表
- 默认的MongoDB端口
- Default MongoDB Read Concerns/Write Concerns
- 服务器会话
- Configuration File Options
- 默认的MongoDB读/写关注
- 退出代码和状态
- MongoDB Limits and Thresholds
- Operators
- 更新说明
- Release Notes for MongoDB 4.4
- Release Notes for MongoDB 4.2
- Release Notes for MongoDB 4.0
- Release Notes for MongoDB 3.6
- Release Notes for MongoDB 3.4
- Release Notes for MongoDB 3.2
- Release Notes for MongoDB 3.0
- Release Notes for MongoDB 2.6
- Release Notes for MongoDB 2.4
- Release Notes for MongoDB 2.2
- Release Notes for MongoDB 2.0
- Release Notes for MongoDB 1.8
- Release Notes for MongoDB 1.6
- Release Notes for MongoDB 1.4
- Release Notes for MongoDB 1.2.x
- MongoDB Versioning
- 技术支持
- 开始使用MongoDB开发
- 联系我们
- 更多资料
- 本书使用 GitBook 发布
storage-engines
Storage Engines The storage engine is the component of the database that is responsible for managing how data is stored, both in memory and on disk. MongoDB supports multiple storage engines, as different engines perform better for specific workloads. Choosing the appropriate storage engine for your use case can significantly impact the performance of your applications.
NOTE
Starting in version 4.2, MongoDB removes the deprecated MMAPv1 storage engine.
➤ WiredTiger Storage Engine (Default) WiredTiger is the default storage engine starting in MongoDB 3.2. It is well-suited for most workloads and is recommended for new deployments. WiredTiger provides a document-level concurrency model, checkpointing, and compression, among other features.
In MongoDB Enterprise, WiredTiger also supports Encryption at Rest. See Encrypted Storage Engine.
➤ In-Memory Storage Engine In-Memory Storage Engine is available in MongoDB Enterprise. Rather than storing documents on-disk, it retains them in-memory for more predictable data latencies.
参见
原文 - Storage Engines
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