Loop through all Mongo collections and execute query

by

There is the db.getCollectionNames() helper method that does this for you. You can then implement your code:

db.getCollectionNames().forEach(function(collname) {
    // find the last item in a collection
    var last_element = db[collname].find().sort({_id:-1}).limit(1);
    // check that it's not empty
    if (last_element.hasNext()) {
        // print its timestamp
        printjson(last_element.next()._id.getTimestamp());
    }
})

You probably also want a .hasNext() check in there to cater for possible empty collections.

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