MongoDB

1. InstallationDownload and install, note the installation method is custom, path customization (D:\CHENGXU\MONGODB), after the installation is successful and then the new Data folder (within the new DB folder) and Logs folder (inside new

Objective: To achieve index creation, query, delete, Explan management and other operating environment:> Db.version () 3.4.7 index creation meets the basic needs: 1; Index increases query speed by 2; In MongoDB, indexes can be created in

#!/usr/bin/env python#coding:utf-8# Author:   --# Purpose: MongoDB的使用# Created: 2014/4/14#32位的版本最多只能存储2.5GB的数据（NoSQLFan：最大文件尺寸为2G，生产环境推荐64位）import pymongoimport datetimeimport random#创建连接conn = pymongo.Connection(‘10.11.1.70‘,27017)#连接数据库db =

last time in a two G of Memory Win Server run a program on the computer, after some time Mongod Auto Stop, found that the log file finally has such an error:2014-11-30t00:32:32.914+0800 [conn30751] command taskdb. $cmd Command:count {count: "Result25

1 Create a file repo file#vim/etc/yum.repos.d/mongodb-org-3.4.repo[mongodb-org-3.4]Name=mongodb

Reprint Please specify Joymufeng, welcome to visit Playscala Community (http://www.playscala.cn/) Capped CollectionsMongoDB has a special collection called capped collections, its insertion speed is very fast, the basic and disk write speed is

Show DBS View all databasesShow Tables View all collectionsdb Displays the current databaseuse+name switches to the specified database and creates a new if it does not existA document is a set of key-value (Key-value) pairs (that is, Bson). MongoDB

Rights Management BasicsMongoDB has a lot of user roles, here is simply to enumerate the use of commands, specific role meaning, please check the official documentation.Https://docs.mongodb.com/manual/reference/built-in-roles/#userAdminBefore you

First, installation1. Download the installation file for MongoDB under WindowsFirst go to the official website https://www.mongodb.com/download-center?jmp=nav#community download the installation files. I downloaded it.2. I am the default

Version selectionMongoDB version naming specifications such as: x.y.z; Y is an odd number to indicate that the current version is a development version, such as: 2.3.0, 2.1.1; Y is even when the current version is stable version, such

The router.js that I want to write is one of my most wanted blogs now. Because he contains the essence of the entire personal blog. Here, all the business logic for the request configuration, the parameters returned, and so on is implemented in this

Querying all the DatabasesShow DBSSpecify to a database/or createUse database nameSpecify storage sizeDb.createcollection ("Mycoll", {capped:true,size 10000})Inserting dataDb. Collection. Insert ({key:values})Db. Collection. Save

db.collection.update :Modifies an existing document or document in the collection. The method can modify the specific fields or documents of an existing document based on the update parameters, or completely replace the existing document.By default,

https://repo.mongodb.org/yum/redhat/6Server/mongodb-org/3.4/x86_64/RPMS/1. Download all RPM PackagesUpload to Server[Email protected] ~]# lltotal 93528-RW-------. 1 root root 1231 Feb 02:07 anaconda-ks.cfg-rw-r--r--1 root root 5900 Jul 06:42 mongodb-

1, first download the corresponding version of MongoDB for installation, I chose the D packing directory to install, in order to facilitate the suggestion folder name as short as possible (D:\MONGODB)2. Create a storage location for the database

The following are some guiding questions for MongoDB's internal mechanism: Replica set failover, how is the master node elected? The ability to manually interfere with a single master node. The official says the number of replicas is

This article is relatively simple, only introduces the Java operation MongoDB Simple crud case, before you need to introduce Mongo-java-driver-3.2.2.jar,java operation MongoDB API many, advanced features also need to query official documents.　　

Create a collection to hold _idDb.createcollection ("counters")Add fields that require self-increment{ "_id": "ProductID", "Sequence_value": 0}Then add the self-increment JS method in the MongoDB library Getnextsequencevaluefunction (sequencename)

MongoShow DBS View all databasesUsing use, you can switch the database, and if there is no database, create a newUse local to switch down the local databaseAdd dataDb.test.insert ({name: "Jack"}) inserts a piece of data into the test table, and if

MongoDB's current high-availability architecture is mainly master-slave, replication sets, and shards, pure master-slave technology is almost eliminated, the overall stability and reliability of the replication set is better than the master and