Create MongoDB collection

create_collection.js

db = db.getSiblingDB('random');

var minDate = new Date(2012, 0, 1, 0, 0, 0, 0);
var maxDate = new Date(2013, 0, 1, 0, 0, 0, 0);
var delta = maxDate.getTime() - minDate.getTime();
  
var documentNumber = arg1;
var batchNumber = 1000;
 
var start = new Date();
var batch = db.randomData.initializeUnorderedBulkOp();
var batchCount = 0;
var index = 1;
 
while (index <= documentNumber) {
    var date = new Date(minDate.getTime() + Math.random() * delta);
    var value = 100 * Math.random();
    var document = {  
        timestamp : date,
        value : value
    };
    batch.insert(document);
    batchCount++;
    // Insert batch
    if (batchCount === batchNumber) {
        printjson(batch.execute());
        print('Inserted ' + db.randomData.count() + ' documents.');
        batch = db.randomData.initializeUnorderedBulkOp();
        batchCount = 0;
    }
    index++;
}
// Insert last batch
if ( batchCount > 0 ) {
    printjson(batch.execute());
    print('Inserted ' + db.randomData.count() + ' documents.');
}

print('Saved ' + db.randomData.count() + ' in ' + (new Date() - start)/1000.0 + 's');

start = new Date();
printjson(db.randomData.createIndex({value:1, timestamp:1}));

print('Created indices in ' + (new Date() - start)/1000.0 + 's');