Question : how create an index mongodb
Answered by : kirkpatrick-brown
db.collection.createIndex({age:1}) //single field asc index on age field
db.collection.createIndex({firstName:1,lastName:-1})//compound index on firstName asc and lastName desc
db.collection.createIndex({locations:1}) //given locations is an array then a multikey index will be created Source : https://docs.mongodb.com/manual/indexes/ | Last Update : Sat, 05 Sep 20
Question : create index mongodb
Answered by : rasel-ahmed-9kilyai1mdfd
//Create a Single-Key Index if All Queries Use the Same, Single Key
db.products.createIndex( { "category": 1 } )
// Create Compound Indexes to Support Several Different Queries
db.products.createIndex( { "category": 1, "item": 1 } )
//Index Use and Collation
db.myColl.createIndex( { category: 1 }, { collation: { locale: "fr" } } )Source : https://www.mongodb.com/docs/manual/tutorial/create-indexes-to-support-queries/ | Last Update : Tue, 28 Jun 22
Question : Create an index in Mongodb
Answered by : careful-chamois-ulnvbnu1t60y
> db.col1.save({'colors': ['red','blue']})
> db.col1.ensureIndex({'colors':1})
> db.col1.find({'colors': 'red'})
{ "_id" : ObjectId("4ccc78f97cf9bdc2a2e54ee9"), "colors" : [ "red", "blue" ] }
> db.col1.find({'colors': 'blue'})
{ "_id" : ObjectId("4ccc78f97cf9bdc2a2e54ee9"), "colors" : [ "red", "blue" ] }Source : https://dev.to/aershov24/30-top-mongodb-interview-questions-and-answers-3d1p | Last Update : Sun, 11 Jul 21
Question : mongodb create index json
Answered by : vishal-4vfs6l0xobcm
{ "v": 1, "unique": false, "key": { "name": 1 }, "name": "name_1", "ns": "test.users", "background": true
}Source : | Last Update : Mon, 23 May 22