mongodb commands pdf

Tags: int names error logging related SQL RDA input new is yourAfter the successful start of MongoDB, and then open a command line window input MONGO, you can do some of the database operations.Enter help to see the basic Operations Command:Show DBS: Display Database listShow Collections: Displays a collection in the current database (similar to a table in a relational database)Show Users: Show userUse Db.help (): Show database Operations Command with

1. Display Server Status: Db.serverstatus () 2. MongoDB can monitor data through profile to optimize it. Check whether the profile function is currently turned on: Db.getprofilinglevel () returns level, value 0|1|2, meaning: 0 for off, 1 for slow command, 2 for all Open profile function: Db.setprofilinglevel (level,slowms); #level等级. At level 1 o'clock, the slow command defaults to SLOWMS (unit ms)(that is, execution time is greater than

Tags: des style http color io using AR strong forAfter the successful start of MongoDB, and then open a command line window input MONGO, you can do some of the database operations.Enter help to see the basic Operations Command:Show DBS: Display Database listShow Collections: Displays a collection in the current database (similar to a table in a relational database)Show Users: Show userUse Db.help (): Show database Operations Command with a lot of comm

Tags: mongodb basic commandsMongodb maintain basic commandsuser admin commands apply to 2.* version 3.* some changes 1. View detailed shard informationMongos>sh.status ()---sharding Status---Sharding version: {"_id": 1,"Version": 4,"Mincompatibleversion": 4,"CurrentVersion": 5,"Clusterid": ObjectId ("569c8e920d9b1cb4bbf4169a")}Shards:{"_id": "Shard1", "host": "Shard1/192.168.0.167:20200,192.168.0. 25:20,1

Comparison between MongoDB and MySQL commands Traditional relational databases are generally composed of three levels: database, table, and record. MongoDB is composedDatabase, collection, and document)Three layers. MongoDB has no concept of columns, rows, and links for tables in relational databases, which reflects th

Label:MongoDB is a very popular NoSQL database management system, officially: MongoDB, I installed in localhost is the Enterprise Server version, the default installation file directory is: C:\Program files\mongodb\server\3.2\bin, click Windows+r, enter cmd, start command Prompt, go to the installation directory Every time you open command prompt you need to enter the installation directory of

column Db.userInfo.find ({sex: {$exists: true}}). Count (); Equivalent to: SELECT COUNT (Sex) from userInfo; Indexes (indexes are created and reused before they can cause efficiency problems) 1. Create an index db.userInfo.ensureIndex ({name:1}); Db.userInfo.ensureIndex ({name:1, TS:-1}); 2. Querying all indexes of the current aggregation collection db.userInfo.getIndexes (); 3. View Total index record size db.userInfo.totalIndexSize (); 4. Read all index information for the current collection

Basic database commands common database commands 1. Help Command Prompt helpdb. help (); db. yourColl. help (); db. youColl. find (). help (); rs. help (); 2. Switch to create database useyourDB. When a set (table) is created, the current database is automatically created. 3. query all databases. 4. Delete Basic database commands common database

Getlasterror command When writing data to a database, MongoDB does not wait for a response message by default. Use the getlasterror command to ensure that the operation has been correctly executed. In many drivers, the getlasterror command is automatically called when you use the "Security" mode (set write concern) for saving and updating. But when this special getlasterror command is called, what actually happens. Here, we will introduce how it works

Tags: FFFFFF 4.0 data start keyword AMP timestamp update required1. Import Pymongo 1. Initializing the Mongo client Client=pymongo. Mongoclient (mongodb:// 10.85.39.45:8188,10.85.39.43:8188,10.85.39.31:8188,10.85.39.32:8188,10.85.39.33:8188,10.85.39.34:8188,10.85.32.16:8188,10 .85.32.33:8188,10.85.39.35:8188,10.85.39.27:8188) 2. Initializing the databaseMongo_database = Client[db_name] 3. Initializing tables STAT_TBL = Mongo_database[stat_tbl_name] 4.

Common commands of MongoDB First, install the database. You can use windows or linux, but linux is recommended. I use ubuntu12.04. you can download the database at the following URL, it is usually a 64-bit system. If you use a linux system, you can use the command line to install mongodb. I just use sudo apt-get install mongo