db.collection.createIndex({ field1: 1, field2: -1 });
db.collection.find({ field1: "value" }).limit(10).skip(20).sort({ field2: 1 }).project({ field3: 1, field4: 1 })
{
_id: ObjectId("61234567890"),
name: "John Doe",
address: {
street: "123 Main St",
city: "New York",
state: "NY"
},
orders: [ObjectId("234567890123"), ObjectId("345678901234")],
}
sudo vi /etc/security/limits.conf
* soft nofile 64000
* hard nofile 64000
