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Home

Technical Articles

Database

MongoDB

How to Use Collations for Case-Insensitive Queries in MongoDB

MongoDBcollationsenablecase-insensitivestringcomparisonsbyspecifyinglanguage-specificrules,suchasusingstrength:1inacollationtoignorecaseanddiacriticdifferences,whichisidealforsearchesorloginsystems;thiscanbeappliedinquerieslikefind()oraggregate(),ens

Aug 23, 2025 am 09:49 AM

mongodb Sorting rules

How to Use GridFS for Storing Large Files in MongoDB

GridFSisMongoDB’ssolutionforstoringlargefilesexceeding16MBbysplittingtheminto255KBchunksacrosstwocollections:oneformetadataandoneforbinarychunks,enablingefficientstreamingandpartialretrieval.

Aug 23, 2025 am 01:46 AM

How to Scale MongoDB with Sharding

ShardingenablesMongoDBtoscalehorizontallybydistributingdataacrossmultipleservers.Ashardedclusterconsistsofshards(datastorage),mongos(queryrouters),andconfigservers(metadatastorage).Theshardkeymusthavehighcardinality,evenwritedistribution,andsupportqu

Aug 22, 2025 am 09:36 AM

How to Manage Users and Roles in MongoDB

TomanageusersandrolesinMongoDB,createuserswithdb.createUser(),assignbuilt-inorcustomrolesforleastprivilegeaccess,andenableauthorizationinconfig;usecommandslikedb.getUsers()anddb.updateUser()formanagementandauditing.

Aug 22, 2025 am 07:45 AM

How to Implement a Tagging System in MongoDB

AMongoDBtaggingsystemworksbestwithproperschemadesignandindexing.Useanarrayofstringsforsimpletagsoranarrayofobjectsfortagswithmetadata.Indexthetagsfield—usedb.collection.createIndex({"tags":1})forstringsordb.collection.createIndex({"tag

Aug 22, 2025 am 06:42 AM

How to Perform A/B Testing with MongoDB

MongoDBsupportsA/Btestingbystoringuserassignmentsandbehaviordata.1.Definetestgoalsandgroups(controlvs.variation).2.Useacollectiontotrackusergroupassignmentswithconsistentrandomization.3.Loguseractionslikeclicksinaneventscollectionlinkedtoexperiments.

Aug 22, 2025 am 05:56 AM

How to Set Up a Replica Set in MongoDB for Fault Tolerance

AMongoDBreplicasetrequiresatleastthreenodesforhighavailability;configureeachinstancewithuniqueports,samereplSetName,andpropernetworkaccess,theninitiatethesetusingrs.initiate()withdefinedmembers,verifyviars.status(),andoptionallyaddanarbiteroradjustme

Aug 21, 2025 pm 05:49 PM

mongodb 副本集

How to Use Compound Indexes Effectively in MongoDB

AcompoundindexinMongoDBimprovesqueryperformancewhenalignedwithquerypatterns.1.Fieldordermattersduetotheleftmostprefixrule:anindexon{status:1,createdAt:-1}supportsqueriesfilteringonstatus,orbothstatusandcreatedAt,butnotoncreatedAtalone.2.Designindexes

Aug 21, 2025 pm 05:03 PM

mongodb composite index

How to Use MongoDB for IoT Data Management

MongoDBisidealforIoTdatamanagementbyusingflexibledocumentmodels,optimizingwritethroughputwithbulkinsertsandtime-seriescollections,indexingstrategicallyforfastqueriesontimestampandlocation,andscalinghorizontallyviashardingondevice_idortimestamptohandl

Aug 21, 2025 pm 04:44 PM

How to Implement Role-Based Access Control in MongoDB

Createuserswithspecificrolesusingdb.createUser(),assigningbuilt-inroleslikeread,readWrite,orcustomrolesforpreciseaccesscontrol.2.Utilizebuilt-inrolesforcommonscenarios,adheringtoleastprivilege.3.Definecustomrolesviadb.createRole()torestrictpermission

Aug 20, 2025 pm 07:04 PM

Effective MongoDB Schema Design Patterns for Scalable Applications

Embed data is preferred when data is always accessed simultaneously, sub-data grows small and does not infinitely, and requires atomic updates; 2. Strategic pre-connection (Denormalization) commonly used associative fields to the main document to improve reading speed, but application logic needs to be kept synchronized; 3. Bucket is used for timing or high-volume data, grouping events by time to reduce the number of documents and improve performance; 4. Similar entities are stored in a single set in polymorphic mode, and distinguished by type fields to simplify query and code. MongoDB scalability depends on the query mode, update frequency and target. Core queries should be optimized first and then iterated designs to avoid late migration costs.

Aug 20, 2025 pm 05:32 PM

How to Choose the Right Shard Key in MongoDB

Awell-chosenshardkeyensuresevendatadistributionandefficientqueries;prioritizehighcardinality,uniformdistribution,andqueryisolationtoavoidbottlenecksandsupportscalability.

Aug 20, 2025 pm 03:26 PM

Installing MongoDB on Windows

DownloadMongoDBCommunityEditionfromtheofficialwebsite,selectingtheWindowsx64MSIpackage.2.RunthedownloadedMSIinstaller,chooseCompleteSetup,installMongoDBasaservice,andoptionallyskipMongoDBCompass.3.CreatethedatadirectorybymakingaC:\data\dbfolderusingF

Aug 20, 2025 pm 03:06 PM

windows mongodb

A Guide to Client-Side Field Level Encryption in MongoDB

CSFLE encryption process: first encrypt the data key with the master key, then encrypt the specified fields with the data key, and the driver automatically handles the encryption and decryption; 2. Key points of key management: the master key is stored in secure environments such as AWSKMS, and the data key is stored in MongoDB's admin.keyVault collection; 3. Field query restrictions: Only deterministic encryption supports precise query, random encryption cannot be queried; 4. Prerequisites for use: JSONSchema mapping needs to be defined in advance, MongoDB4.2 and the driver version is compliant; 5. Key risk warning: loss of key means permanent data loss, be sure to back up the data key, and the encrypted field cannot create a valid index.

Aug 19, 2025 pm 08:05 PM

mongodb 客戶端加密