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Tags: www RDBMS equals closed blog alt start EXE 2.0 "Note: MongoDB automatically sets the _id field as the primary key" --------------------------------------------------------------------------------------------------------------- -----------------------------------------------------------------------------------> Don't say a word, just start knocking at the command! "Note 1:
After 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, but MongoDB does not have a command to create a database, but there are similar commandsFor exa
Label:After 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, but MongoDB does not have a command to create a database, but there are similar commands
After 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, but MongoDB does not create a database command, but there are similar commands such as: If you
Label:1. Connect MongoDB: Mongodb://username:[email Protected]/dbname 2. Create a database: Use dbname: Create the database if the database does not exist, or switch to the specified database. 3. View all databases: Show DBS Note: The command does not display the newly created empty database, and if you want to show t
Label:1,mongodb the same points and differences between insert () and save ()Difference: If there is a primary key in the new data, insert () will prompt the error, and save () changes the original content to the new content.Insert ({_id:1, "name": "N2"}) will report a duplicate error prompt for the primary key.Save ({_id:1, "name": "N2"}) will change N1 to N2.Th
Label:
MongoDB Basic Command
>show DBS//Display a list of current data
>DB//Display the current database object or collection
>use ' DB name '//connect to a specified database
Keep the database name:
Admin: From a permission point of view, is the root database
Local: This database is never replicated
Label:Database Common Commands 1. Help View command Prompt Help Db.help (); Db.yourColl.help (); Db.youColl.find (). Help (); Rs.help (); 2. Switch/CREATE Database Use Yourdb; The current database is created automatically when a collection (table) is created 3. Query all databases Show DBS; 4. Delete the currently used database Db.dropdatabase (); 5. Cloning a database from a specified host Db.clonedatabase
Label:MongoDB: https://www.mongodb.com/download-center#community;MongoDB download After the installation, choose Custom Installation, installed into a root directory, such as c,d,e,f disk;After MongoDB is installed, there will be a bin folder in the root directory just defined;MongoDB connection command: 1.cd bin,2.mon
files.Number of processes should is at least 32000:0.5 times number of files.Reference: http://blog.csdn.net/kk185800961/article/details/45613267Current limitations of MongoDB: Processes, 64000 filesMongoDB Recommended Requirements: Processes = 0.5*files=32000 (at least)So you need to change the processes from 1024 to 32000 or greater.To modify the configuration file/etc/security/limits.conf, add the configuration information:############## #for
First download the installation package to the MongoDB site http://www.mongodb.org/Choose according to your operating system type and 32/64-bit.
Installing on Windows
Unzip the installation package and then create a directory for the data file, MongoDB the default C:\data\db as the data directory, or create other empty directories to save.
Set up the data directory, open the
Label:DB Shell Data operation Shell command manipulation syntax is similar to JavaScript, in fact, the bottom of the console query statements are done with JavaScript script. #数据库 operation 1. Help View command Prompt > Help
> Db.help ();
> db.yourColl.help ();
> Db.youColl.find (). Help ();
> Rs.help (); 2. Switch/CREATE Database > Use YOURDB; The current dat
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1. Common commands
show DBS Show all databases
use dbname into dbname database, if not present,
db View database
show collections displays the collection in the database--equivalent to the table in MySQL!
Create Add
db.users.save ({" Name ":" LECAF "}), created a collection called Users,
db.users.insert ({" Name ":" Ghost "," Age ": 10}) inserts a new data into the
After a short essay, the installation of MongoDB can be done after the most basic database operation, the following steps to achieve your Hello world!1. Open terminal Execution Brew services start MongoDB start MongoDB service, execute MONGO open shell operation;2. Show All DB: show dbs3. Enable a DB: Use mydb (if no mydb will automatically create this library)4.
After 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 user
Use Db.help (): Show da
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