sleep()

Definition

sleep(ms)

Parameter	Type	Description
ms	integer	A duration in milliseconds.

sleep() suspends a JavaScript execution context for a specified number of milliseconds.

Example

Consider a low-priority bulk data import script. To avoid impacting other processes, you may suspend the shell after inserting each document, distributing the cost of insertion over a longer period of time.

The following example mongo script will load a JSON file containing an array of documents, and save one element every 100 milliseconds.

JSON.parse(cat('users.json')).forEach(function(user) {
    db.users.save(user);
    sleep(100);
});