🦸‍♂️ Aggregation options

info

Extra activity, do it if you have extra time or are following at home, won't be covered during the hands-on Lab

danger

The following syntax doesn't work in the Atlas UI aggregations editor.

We can pass a document to aggregate with some options.

let options = {
    maxTimeMS: 100
};

db.authors.aggregate([], options);

💻 Have a look at the different options you can pass to the aggregate method.

💻 Try to launch an itcount (a long operation) to iterate through the whole books cursor with a time limit of 10 ms: you should see the operation timing out and failing.

let options = {
    maxTimeMS: 10
};

db.authors.aggregate([], options).itcount();

> MongoServerError: operation exceeded time limit