When you log in to MongoDB, you can use the Help command to view the assistance Document System-level Help documentation > Helpdb.help () Help on DB methods # Database-Level Assistance Document DB.MYCOLL.HELP () Assist on Collectio N Methods # Collection-Level help document SH.HELP () sharding Helpers # Help document about Shards Rs.help () replica set HELPERSHELP Admin Administrative Assist # Management Help connection connecting to a DB Help # connecting to a database assist document helping keys key Shortcutshelp misc Misc Things to Knowhelp Mr MapReduce show DBS Show Database names # show databases show collections show collections in the current database # Display collection show users show user s in current database # Show user Show profile show most recent system.profile entries with time >= 1ms # show Profileshow logs Show the accessible logger names # shows the log (just what logs are shown) show log [name] prints out the last segment of log in memory, ' global ' I s default # Displays the contents of the specified log use <db_name> set current database # switches to the specified databases and, if not present, creates the default Db.foo.find () List objects in Collectio n Foo # queries all data Db.foo.find ({a:1}) List objects in Foo where a = = 1 # query specifies data it result of the last line evaluated; Use to further Iteratedbquery.shellbatchsize = X Set default number of items to display on Shellexit quit the MONGO shell> database level help document uses DB. database name Called. Help () For example: > db.mymongo.help () dbcollection helpdb.mymongo.find (). Help ()-Show dbcursor Help # Query Help document Db.mymongo.bulkWrite (operations, <optional params>)-Bulk Execute write operations, optional parameters are: W, Wtimeout, jdb.mymongo.count (query = {}, <optional params>)-Count the number of documents that matches the Que ry, optional Parameters are:limit, skip, hint, MaxTimeMSdb.mymongo.copyTo (newcoll)-duplicates collection by copying all Documents to Newcoll; No indexes is copied.db.mymongo.convertToCapped (maxbytes)-Calls {converttocapped: ' Mymongo ', Size:maxbytes}} Commanddb.mymongo.createIndex (Keypattern[,options]) db.mymongo.createIndexes ([Keypatterns], <options>) Db.mymongo.dataSize () Db.mymongo.deleteOne (filter, <optional params>)-delete first matching document, optional p Arameters are:w, Wtimeout, Jdb.mymonGo.deletemany (filter, <optional params>)-Delete all matching documents, optional parameters are:w, Wtimeout, JD B.MYMONGO.DISTINCT (key, query, <optional params>)-e.g. db.mymongo.distinct (' x '), optional parameters Are:maxt ImeMSdb.mymongo.drop () Drop the Collectiondb.mymongo.dropIndex (index)-e.g Db.mymongo.dropIndex ("IndexName") or Db.mymongo.dropIndex ({"Indexkey": 1}) Db.mymongo.dropIndexes () Db.mymongo.ensureIndex (Keypattern[,options])- DEPRECATED, use CreateIndex () Insteaddb.mymongo.explain (). Help ()-Show explain Helpdb.mymongo.reIndex () Db.mymongo.find ([query],[fields])-query is a optional query filter. Fields are optional set of fields to return.e.g. Db.mymongo.find ({x:77}, {name:1, x:1}) Db.mymongo.find (...). Count () Db.mymongo.find (...). Limit (n) db.mymongo.find (...). Skip (N) db.mymongo.find (...). Sort (...) Db.mymongo.findOne ([query], [fields], [options], [Readconcern]) Db.mymongo.findOneAndDelete (filter, <optional params>)-delete first Matching document, optional parameters are:projection, sort, maxTimeMSdb.mymongo.findOneAndReplace (filter, replacement, < Optional params>)-replace first matching document, optional parameters are:projection, sort, maxtimems, Upsert, ret UrnNewDocumentdb.mymongo.findOneAndUpdate (filter, update, <optional params>)-Update first matching document, op tional parameters are:projection, sort, maxtimems, Upsert, ReturnNewDocumentdb.mymongo.getDB () Get DB object associated W ITH Collectiondb.mymongo.getPlanCache () Get query plan cache associated with collectiondb.mymongo.getIndexes () Db.mymongo.group ({key: ..., initial: ..., reduce: ...) [, cond: ...] }) Db.mymongo.insert (obj) db.mymongo.insertOne (obj, <optional params>)-Insert a document, optional parameters is : W, Wtimeout, Jdb.mymongo.insertMany ([objects], <optional params>)-Insert multiple documents, optional Paramete Rs Are:w, Wtimeout, Jdb.mymongo.mapReduce (mapfunction, reducefunction, <optional params>) Db.mymongo.aggregate ([pipeline], <optional params>)-Performs an aggregation on a collection; Returns a Cursordb.mymongo.remove (query) Db.mymongo.replaceOne (filter, replacement, <optional params>)-Replace The first matching document, optional parameters Are:upsert, W, Wtimeout, Jdb.mymongo.renameCollection (NewName, <dro ptarget>) renames the Collection.db.mymongo.runCommand (name, <options>) runs a DB command with the given name Where the first param is the collection namedb.mymongo.save (obj) db.mymongo.stats ({scale:n, indexdetails:true/false, Ind Exdetailskey: <index key>, indexdetailsname: <index name>}) Db.mymongo.storageSize ()-Includes free space Allocated to this collectiondb.mymongo.totalIndexSize ()-size in bytes of all the Indexesdb.mymongo.totalSize ()-Storage Allocated for all data and indexesdb.mymongo.update (query, object[, Upsert_bool, Multi_bool])-instead of both flags, Y OU can pass an object with Fields:upserT, Multidb.mymongo.updateOne (filter, update, <optional params>)-Update the first matching document, optional par Ameters Are:upsert, W, Wtimeout, Jdb.mymongo.updateMany (filter, update, <optional params>)-Update all matching Documents, optional Parameters Are:upsert, W, Wtimeout, Jdb.mymongo.validate (<full>)-SLOWdb.mymongo.getShardVe Rsion ()-only if use with shardingdb.mymongo.getShardDistribution ()-Prints statistics about data distribution in the C Lusterdb.mymongo.getSplitKeysForChunks (<maxChunkSize>)-calculates split points over all chunks and returns split ter Functiondb.mymongo.getWriteConcern ()-Returns the write concern used for all operations on this collection, inherited From server/db if Setdb.mymongo.setWriteConcern (<write concern doc>)-sets the write concern for writes to the C Ollectiondb.mymongo.unsetWriteConcern (<write concern doc>)-Unsets The write concern for writes to the collection Table-level help document, using the DB. Name of the table. hELP () such as:> db.noPK.help () dbcollection helpdb.noPK.find (). Help ()-Show dbcursor helpdb.noPK.bulkWrite (Operations, <optional params>)-Bulk Execute write operations, optional parameters are:w, wtimeout, jdb.noPK.count (query = { }, <optional params>)-Count the number of documents that matches the query, optional parameters are:limit, skip, Hint, MaxTimeMSdb.noPK.copyTo (newcoll)-duplicates collection by copying all documents to newcoll; No indexes is copied.db.noPK.convertToCapped (maxbytes)-Calls {converttocapped: ' NOPK ', Size:maxbytes}} Commanddb.noPK.createIndex (Keypattern[,options]) db.noPK.createIndexes ([Keypatterns], <options>) Db.noPK.dataSize () Db.noPK.deleteOne (filter, <optional params>)-delete first matching document, optional Paramet ERs are:w, Wtimeout, Jdb.noPK.deleteMany (filter, <optional params>)-Delete all matching documents, optional par Ameters are:w, Wtimeout, jdb.noPK.distinct (key, query, <optional params>)-e.g. Db.noPK.distinct (' x '), optional Parameters Are:maxTimeMSdb.noPK.drop () Drop the Collectiondb.noPK.dropIndex (index)-E . G. Db.noPK.dropIndex ("IndexName") or Db.noPK.dropIndex ({"Indexkey": 1}) Db.noPK.dropIndexes () Db.noPK.ensureIndex (k Eypattern[,options])-DEPRECATED, use CreateIndex () Insteaddb.noPK.explain (). Help ()-Show explain Helpdb.noPK.reIndex () Db.noPK.find ([query],[fields])-query is an optional query filter. Fields are optional set of fields to return.e.g. Db.noPK.find ({x:77}, {name:1, x:1}) Db.noPK.find (...). Count () Db.noPK.find (...). Limit (n) db.noPK.find (...). Skip (N) db.noPK.find (...). Sort (...) Db.noPK.findOne ([query], [fields], [options], [Readconcern]) Db.noPK.findOneAndDelete (filter, <optional params >)-delete first matching document, optional parameters are:projection, sort, maxTimeMSdb.noPK.findOneAndReplace (fi Lter, replacement, <optional params>)-replace first matching document, optional parameters are:projection, sort, Maxtimems, Upsert, reTurnNewDocumentdb.noPK.findOneAndUpdate (filter, update, <optional params>)-Update first matching document, Opti Onal parameters are:projection, sort, maxtimems, Upsert, ReturnNewDocumentdb.noPK.getDB () Get DB object associated with C Ollectiondb.noPK.getPlanCache () Get query plan cache associated with collectiondb.noPK.getIndexes () Db.noPK.group ({key : ....., initial: ....., Reduce: ... [, cond: ...] }) Db.noPK.insert (obj) db.noPK.insertOne (obj, <optional params>)-Insert a document, optional parameters are:w, W Timeout, Jdb.noPK.insertMany ([objects], <optional params>)-Insert multiple documents, optional parameters are:w , Wtimeout, Jdb.noPK.mapReduce (mapfunction, reducefunction, <optional params>) db.noPK.aggregate ([pipeline], &L T;optional params>)-Performs an aggregation on a collection; Returns a Cursordb.noPK.remove (query) Db.noPK.replaceOne (filter, replacement, <optional params>)-Replace the FIR St matching document, optional parameTers Are:upsert, W, Wtimeout, Jdb.noPK.renameCollection (NewName, <dropTarget>) renames the collection.db.noPK.ru Ncommand (name, <options>) runs a DB command with the given name where the first param is the collection namedb.no Pk.save (obj) db.noPK.stats ({scale:n, Indexdetails:true/false, Indexdetailskey: <index key>, Indexdetailsname: <index Name>}) Db.noPK.storageSize ()-Includes free space allocated to this collectiondb.noPK.totalIndexSize ()-Si Ze in bytes of "All" indexesdb.noPK.totalSize ()-Storage allocated for all data and indexesdb.noPK.update (query, OBJEC t[, Upsert_bool, Multi_bool])-instead of the flags, you can pass a object with Fields:upsert, Multidb.noPK.updateOne ( Filter, UPDATE, <optional params>)-Update the first matching document, optional parameters Are:upsert, W, Wtime Out, Jdb.noPK.updateMany (filter, update, <optional params>)-Update all matching documents, optional parameters a Re:upsert, W, Wtimeout, JDB.NOpk.validate (<full>)-SLOWdb.noPK.getShardVersion ()-only if use with shardingdb.noPK.getShardDistribution ()- Prints statistics about data distribution in the Clusterdb.noPK.getSplitKeysForChunks (<maxChunkSize>)-Calculate S split points over all chunks and returns splitter Functiondb.noPK.getWriteConcern ()-Returns the write concern used for Any operations on the collection, inherited from server/db if Setdb.noPK.setWriteConcern (<write concern doc>)- Sets the write concern for writes to the Collectiondb.noPK.unsetWriteConcern (<write concern doc>)-Unsets the WRI Te concern for writes to the collection>
MongoDB Help documentation
