markdown MongoDB的

Posted 2021-05-06

`http://localhost:5000/collection?where={"timestamp": "20180101"}`

`?sort=[("total": -1)]`

`?max_results=20&page=2`

`?projection={"predict": 0}` return all but predict

`?projection={"predict": 1}` return only predict

`?embedded={"author": 1}` join-alike (converts id into embedded document)

`?where={ "status_id": { "$in": [${this.queryParams.activeStatuses.join(',')}] }, "timestamp": {"$gt": 111, "$lt": 222} }`

Enable profiling `db.setProfilingLevel(1)`

Show most recent slow query `db.system.profile.find().sort({$natural: -1}).limit(1)`

Show all indexes for DB:
```
db.getCollectionNames().forEach(function(collection) {
   indexes = db[collection].getIndexes();
   print("Indexes for " + collection + ":");
   printjson(indexes);
});
```

An index for one of workers-cache collections
```
	{
		"v" : 2,
		"key" : {
			"cacheKey" : 1
		},
		"name" : "cacheKey",
		"ns" : "workers-cache.emailage_mongo"
	}
```

Create index: `db.COLLECTION.createIndex( { "cacheId": 1 } )`

Drop DB: `db.collection.drop()`

Get 50 random documents: `db.imported.aggregate([{ $sample: {size: 50} }])`

Update/convert timestamp in each doc:
```
db.history.find().forEach(function(doc){
  doc.timestamp = new Date(doc.timestamp).getTime();
  db.history.save(doc);
});
```

### Add user
```
mongo "mongodb://root:MdQKIGrUx3kRQOL7@10.10.2.81:32017/workers-cache?authSource=admin"
use workers-cache
db.createUser({ user: "worker", pwd: "MdQKIGrUx3kRQOL7", roles: [ {role: "readWrite", db: "workers-cache"}] })
```

`db.users.deleteOne({"email": "[e-mail]"})`

`db.users.find({"contacts.email": "[e-mail]"}).pretty()`

`mongo 'mongodb://partscout:[e-mail]:27017,partscout-shard-00-01-dvsc7.mongodb.net:27017,partscout-shard-00-02-dvsc7.mongodb.net:27017/partscout-staging?ssl=true&authSource=admin&replicaSet=partscout-shard-0'`