MongoDB provides various methods to retrieve and monitor MongoDB Performance.

As part of our Server Management Services, we assist our customers with several MongoDB queries.

Today, let us take a look at a few useful tools to Monitor MongoDB Performance

 

Monitor MongoDB Performance

MongoDB is a favorite database for developers. Once we successfully deploy the database, we need to monitor its performance while it is running.

This is one of the most important tasks under database administration.

The MongoDB database environment can be simple or complicated, local or distributed, on-premises, or in the cloud.

However, if we want to ensure a performant and available database, we should be tracking and monitoring analytics in order to:

• Determine the current state of the database
• Review performance data to identify any abnormal behavior
• Provide some diagnostic data to resolve identified problems
• Fix small issues before they grow into larger issues
• Keep your environment up and running smoothly
• Ensure ongoing availability and success

There are many things we can monitor in a MongoDB environment. Here are a few key areas.

We should be analyzing the following metrics:

• Replication lag:

Replication lag refers to delays in copying data from the primary node to a secondary node.

• Replica state:

This a method of tracking if secondary nodes have died. It also tracks if there was an election of a new primary node.

• Locking state:

The locking state show set data locks and their length of time.

• Disk utilization:

Disk utilization refers to disk access.

• Memory usage:

Memory usages refer to how much memory is in use, and how it is in use.

• Number of connections:

The number of connections the database has open in order to serve requests as quickly as possible.

[Need someone to monitor? We are available 24*7]

 

Useful tools to Monitor MongoDB Performance

Luckily enough, MongoDB provides various methods for retrieving its performance and activity.

Furthermore, let us look at monitoring utilities and database commands.

• Mongostat

MongostatCopy Code

is similar in functionality to

vmstatCopy Code

monitoring tool, which is available on all major Unix-like operating systems.

It helps to get a quick overview of the status of our database. Mongostat provides a dynamic real-time view of a running

mongodCopy Code

or

mongosCopy Code

instance.

Similarly, it retrieves the counts of database operations by types, such as insert, query, updates, deletes, etc.

You can run

mongostatCopy Code

as shown. If we have authentication enabled, we put the user password in single quotes to avoid any error.

$ mongostat -u “root” -p ‘=@!#@%$admin1’ –authenticationDatabase “admin”Copy Code

For more

mongostatCopy Code

usage options, we type the following command:

$ mongostat –helpCopy Code

• Mongotop

Mongotop also provides a dynamic real-time view of a running MongoDB instance. It tracks the amount of time a MongoDB instance spends reading and writing data. It returns values every second, by default.

$ mongotop -u “root” -p ‘=@!#@%$admin1’ –authenticationDatabase “admin”Copy Code

Then, for more

mongotopCopy Code

usage options, we type the following command.

$ mongotop –helpCopy Code

• serverStatusCopy Code

  Command

First, we need to run the following command to login into

mongoCopy Code

shell.

$ mongo -u “root” -p ‘=@!#@%$admin1’ –authenticationDatabase “admin”Copy Code

Then, we run the

serverStatusCopy Code

command.  It provides an overview of the database’s state, by collecting statistics about the instance.

>db.runCommand( { serverStatus: 1 } )
OR
>db.serverStatus()Copy Code

• dbStatsCopy Code

  Command

The

dbStatsCopy Code

command returns storage statistics for a particular database, such as the amount of storage used, the quantity of data contained in the database, and object, collection, and index counters.

>db.runCommand({ dbStats: 1 } )
OR
>db.stats()Copy Code

• collStatsCopy Code

collStatsCopy Code

command is to collect statistics similar to dbStats on the collection level. However, its output includes the size, the amount of disk space consumed, and information concerning its indexes, etc.

>db.runCommand( { collStats : “aurthors”, scale: 1024 } )Copy Code

• replSetGetStatusCopy Code

  Command

The replSetGetStatus command outputs the status of the replica set from the perspective of the server that processed the command. We must run this command against the admin database in the following form:

>db.adminCommand( { replSetGetStatus : 1 } )Copy Code

In addition, we can also use third-party monitoring tools either directly, or via their own plugins. These include mtop, Munin, and Nagios.

[Need help with the process? We’d be happy to assist]

 

Conclusion

To conclude, we have covered some useful monitoring utilities and database commands for reporting statistics about the state of a running MongoDB instance.