MongoDB
From Wasya Wiki
Contents
Install
From: https://docs.mongodb.com/manual/tutorial/install-mongodb-on-os-x/
From: https://docs.mongodb.org/manual/tutorial/install-mongodb-on-ubuntu/
From: https://docs.mongodb.com/manual/tutorial/install-mongodb-on-red-hat/
Develop
rename a field, or paste one field to another collection-wide
Methods are: updateOne, updateMany or update
db.collection.<update method>( {}, [ {"$set": {"name": { "$concat": ["$firstName", " ", "$lastName"]}}} ] )
Count Documents
db.collection.aggregate( [ { $group: { _id: null, count: { $sum: 1 } } } ] )
list users
use admin; db.getUsers();
create user
use admin;
db.createUser( { user: "myTester", pwd: passwordPrompt(), // or cleartext password roles: [ { role: "readWrite", db: "test" }, { role: "read", db: "reporting" } ] } )
Performance Tuning
db.getProfilingStatus() db.getProfilingLevel() db.setProfilingLevel(1, 10) db.getCollection('system.profile').find({})
add member to cluster
operaeventrsX:PRIMARY> rs.add("10.138.96.89") operaeventrsX:PRIMARY> rs.conf()
profiling
Profiling. From: https://docs.mongodb.com/manual/reference/method/db.setProfilingLevel/
The profiler writes all the data it collects to the system.profile collection, a capped collection in the admin database.
db.getProfilingStatus() # db.setProfilingLevel(level, options) db.setProfilingLevel(1, { "slowms": 500 })
db.enableFreeMonitoring()
use creek_development db.setProfilingLevel(1, { "slowms": 500 }) db.getCollection('system.profile').find({}).sort({"ts": -1}).limit( 5 )
db.lineitems.getIndexes()