Command to reindex all mongodb collections

Question

References to reindexing MongoDB collections are usually per collection:

db.mycollection.reIndex();

I'd like to reindex a number of collections all at once. One-by-one can get a bit tiring.

What's the appropriate command to issue reIndex(); across all collections?

Answer 1

Slightly smaller version of Sergio's answer:

db.getCollectionNames().forEach(function(collection){db[collection].reIndex()});

There is no need to get a reference to the collection first.

Answer 2

What about this? It's still one-by-one for the database, but just one command for you.

db.getCollectionNames().forEach(function(coll_name) {
  var coll = db.getCollection(coll_name);
  coll.reIndex();
});