Finding the size of all MongoDB collections

04/28/2014

Here’s a helpful script for finding the size of every table in MongoDB in MB:

var collNames = db.getCollectionNames();
for (var i = 0; i < collNames.length; i++) {   
  var coll = db.getCollection(collNames[i]); 
  var stats = coll.stats(1024 * 1024); 
  print(stats.ns, stats.storageSize);
}