How to check MongoDB storage engine in use

Mongo console

db.serverStatus().storageEngine

You will see a response like…

{ "name" : "wiredTiger" }

To get more information about the engine (in this case wiredTiger)

db.serverStatus().wiredTiger

MongoDB: Print document count for all collections in a DB

var collections = db.getCollectionNames();
for(var i = 0; i < collections.length; i++){
  var name = collections[i];
  print(name + ' - ' + db[name].count() + ' records');
}

MongoDB: Count of Indexes on a collection

This simple one liner will list all the collections along with the number of indexes it has.

db.getCollectionNames().forEach(function(collection) {print(collection + ": " + db[collection].getIndexes().length);});

 

More info here:

https://stackoverflow.com/questions/39952005/count-of-indexes-for-each-collection-in-mongodb

Maven annoyances: Dynamic Web Module 3 1 requires Java 1 7 or newer

Solution to this irritating problem can be found here

http://javahonk.com/dynamic-web-module-3-1-requires-java-1-7-or-newer/

Maven annoyances: “Web.Xml Is Missing And Is Set To True”

So you are getting this error in your Eclipse IDE

web.xml is missing and <failOnMissingWebXml&gt> is set to true

Here how you fix this silly error

Right click the project->Java EE Tools->Generate Deployment Descriptor Stub

Voila. Problem fixed.