manual reference

How to open the Shell client: MONGO. Db.shutdownserver () can be used when shutting down the database engine.One, Shell commandThe MongoDB shell provides commands that can be executed from the shell prompt.Help: Used to display syntax help for the

MongoDB splits the documents in the collection according to the Sharding key, and then assigns them to the members of the Shard cluster.The Shard key can be an indexed field or compound index field that exists in each file.MongoDB uses a different

#./mongod2018-04-15t18:52:36.352+0800 i control  [initandlisten] mongodb starting :  pid=36578 port=27017 dbpath=/data/db 64-bit host= Ibg-opensource-db-cwt132018-04-15t18:52:36.352+0800 i control  [initandlisten] db  version v3.6.22018-04-15t18:52:3

First, the latitude and longitude of the representation wayThe storage of latitude and longitude in MongoDB has its own set of specifications (mainly for the purpose of establishing a geospatial index on that field). There are two ways, namely

MongoDB The database defaults to no user name and password, that is, no access restrictions. To facilitate database management and security, database users need to be created. User-created syntax format {user: " " , pwd : " " ,customdata: {

Directory Brief introduction MongoDB installation (Windows) Getting Started with MongoDB basic syntax and operations (Mongo.exe client operations) Library operations Insert Inquire Modify Delete

Mongodb:https://docs.mongodb.com/manual/tutorial/install-mongodb-on-linux/#install-mongodb-community-editionFirst, download the installation# Curl-o Https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel62-3.2.9.tgzOr# wget

configuration file (profile) file formatUse the configuration file (using a profile) core options (Kernel settings) systemlog Options (System log settings)Processmanagement Options (Process management settings)NET Options

Recently, using MongoDB, it is found that MONGO's definition of field type is not very strict, it relies entirely on the type of incoming data, and the addition of PHP is a weak type of language, so there will inevitably be some errors. If the

Original address: http://www.cnblogs.com/zhongweiv/p/node_mongodb.htmlDirectory Brief introduction MongoDB installation (Windows) Getting Started with MongoDB basic syntax and operations (Mongo.exe client operations)

If the type writes an error, it can be modified in the command line in the following way.Db.jobtracker_data.find ({' collect_time ': {$type: 2}}). ForEach (function (x) { x.collect_time = parseint (x.collect _time); Db.jobtracker_data.save (x);

This article translated from: https://docs.mongodb.com/manual/reference/sql-aggregation-comparison/Because I am also learning MongoDB, the project to use aggregation, see the document this good translation (for reference only)The aggregation

MongoDB built-in role Database user role: Read, readWrite; Database management roles: DbAdmin, Dbowner, useradmin; Cluster Management role: Clusteradmin, Clustermanager, Clustermonitor, Hostmanager; Backup recovery role: backups,

Problem Description:On the newly installed CentOS7, install the MongoDB3.4, mount a large data disk, modify the/etc/mongo.conf, the log and data directories in the configuration file are placed under the new data disk, and modify the file access

There are two types of MongoDB references: Manual reference (Manual References) DBRefs DBRefs vs Manual ReferenceConsider a scenario in which we store different addresses (address, Office address, email address, etc.) in

MongoDB Installation The version used is 3.0 and the virtual machine operating system is rhel-server-7.0-x86_641. Upload and unzip the mongodb-linux-x86_64-rhel70-3.0.11.tgz to the/usr/local/mongodb directory2. Setting Environment variables#

A simple look at MapReduce, I try not to look at the detailed API to do a group effect, the results encountered a lot of problems, listed here, if others have encountered a similar bug, you can retrieve the results. First look at the data of the

Some additions and deletions of MongoDB change the command operation: Official document reference https://docs.mongodb.com/manual/reference/method/　　#查看当前mongod下有哪些数据库: Show dbs# enters or creates a database: UseDatabase name Use db_name#查看当前数据库下,

The Mongoperf tool was not found before, and the state of the test IO was iostat for observation. Myjsonconfigfile"{nthreads:2,filesizemb:20,w:true,r:true}"| mongoperfThe parameters are listed as follows:{Nthreads:N>filesizemb:n> sleepmicros:n>

No more nonsense.Three machinesHost1,host2,host3View official Installation Documentation https://docs.mongodb.com/manual/tutorial/install-mongodb-on-red-hat/Edit Source fileVim/etc/yum.repos.d/mongodb-org-3.4.repo[Mongodb-org-3.4]name=mongodb