Learning about mongostat

This tool produces a brief summary of relevant statistics of the currently running MongoDB instances, either the mongod or mongos instance.

The following screenshot illustrates the output of this tool:

The preceding screenshot shows you the number of queries, update, insert, and delete operations from the database every second.

The following bullet list gives you a brief description for each column:

The refresh interval can be changed using the following command:

mongostat [options] [sleep time] 

Utilizing mongotop

The mongotop utility provides you with a mechanism to get information about time spent on read/write operations. This command is similar to Unix's top command.

The following screenshot shows you a simple usage of mongotop:

Understanding mongosniff

The mongosniff is a tool that is used to fetch live MongoDB collection statistics. While inserting or querying data from the MongoDB instances, you can run the mongosniff command and connect it to your MongoDB instance to see what the database does.

A simple usage of the mongosniff tool is as follows:

sudo mongosniff --source NET lo0

The preceding command line will listen to the loopback interface (localhost). This interface is lo0 in Mac OS systems and lo for other operating systems, usually. You can get the list for your network interfaces using the ifconfig command. If you're using Windows as the operating system, you can get the list of network interfaces using the following command:

ipconfig /all

File storage (GridFS) tools

With the help of GridFS, MongoDB can be used as a filesystem. The processes in this section are used to manage and control the GridFS feature.

There is one process in this category, which is as follows:

mongofiles <options> <commands> <filename>

mongofiles -d mydb list