How to delete lots of mongodb collections at once?

Question

There are a lot of mongodb collections in my database that I need to delete. They all have similar names, and it would be easy to delete them if only wildcard characters cou

Answer 1

You can delete all the collections using the following command.

> use database_name;

> db.getCollectionNames().forEach(function(c) {
    if(c != 'system.indexes') { 
        db.getCollection(c).drop();
    }
  });

Answer 2

No, there's not a way to drop several collections by a wildcard/regex. You have to drop them one by one. I recently performed a similar task and my script was able to drop ~20-30 collections per second. How many do you have?

Answer 3

For regex you can use string.match

db.getCollectionNames().forEach(function(c) {
    if(!c.match("^system.indexes")) { 
        db.getCollection(c).drop();
    }
  });

Answer 4

You can drop every collection in the database with db.dropDatabase() in the mongo shell. Just make sure you really want to nuke everything before you do.

Answer 5

# Delete Particular Collections From MongoDB

> use database_name

> delete_collection_list = ["collection1", "collection2", "collection3", "collection4", "collection5", "collection6"]

> delete_collection_list.forEach( function (collection) {
    if (db.getCollectionNames().indexOf(collection)>=0) {
        db.getCollection(collection).drop();
        print("Deleted Collection: "+ collection);
    }
  })