Monitoring MongoDB performance with mongostat

In this recipe, we will take a look at the mongostat utility, which is bundled with standard MongoDB binary distributions. This tool gives good insights into MongoDB utilization and is also capable of being used programmatically.

Getting ready

For this recipe, at a minimum, you need a single-node MongoDB setup.

How to do it...

1. Connect to you mongod instance and run a bunch of inserts, updates, and deletes:

use mydb

for(var x=0; x<20000; x++){
  db.mycol.insert({age:(Math.round(Math.random()*100)%20)});
  db.mycol.findAndModify({query: {age: (Math.round(Math.random()*100)%20)}, update:{$inc: {age: 2}}});
  db.mycol.remove({age:(Math.round(Math.random()*100)%20)});
}

2. In a separate Terminal, execute the mongostat command. You should see output similar to this:

3. Execute mongostat to only give the insert rate and count:

mongostat -o 'host,metrics.document.inserted.rate()=insert_rate,metrics.document.inserted=inserted_count'

4. You should see output similar...