![\"Image](\"https:\/\/udemy-images.udemy.com\/course\/750x422\/1906852_93c6.jpg\")
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We recently showed how to install\u00a0MongoDB in Ubuntu 18.04<\/a>. Once you have successfully deployed your database, you need to monitor its performance while it is running. This is one of the most important tasks under database administration.<\/p>\n Luckily enough,\u00a0MongoDB<\/strong>\u00a0provides various methods for retrieving its performance and activity. In this article, we will look at monitoring utilities and database commands for reporting statistics about the state of a running MongoDB instance.<\/p>\n Mongostat<\/strong>\u00a0is similar in functionality to\u00a0vmstat monitoring tool<\/a>, which is available on all major Unix-like operating systems such as Linux, FreeBSD, Solaris as well as MacOS.\u00a0Mongostat<\/strong>\u00a0is used to get a quick overview of the status of your database; it provides a dynamic real-time view of a running\u00a0mongod<\/strong>\u00a0or\u00a0mongos<\/strong>\u00a0instance. It retrieves the counts of database operations by type, such as insert, query, update, delete and more.<\/p>\n You can run\u00a0mongostat<\/strong>\u00a0as shown. Note that if you have authentication enabled, put the user password in single quotes to avoid getting an error, especially if you have special characters in it.<\/p>\n Monitor MongoDB Performance<\/p>\n For more\u00a0mongostat<\/strong>\u00a0usage options, type the following command.<\/p>\n Mongotop<\/strong>\u00a0also 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.<\/p>\n Monitor MongoDB Activity<\/p>\n<\/div>\n For more\u00a0mongotop<\/strong>\u00a0usage options, type the following command.<\/p>\n First, you need to run the following command to login into\u00a0mongo<\/strong>\u00a0shell.<\/p>\n Then run the\u00a0serverStatus<\/strong>\u00a0command, which provides an overview of the database\u2019s state, by collecting statistics about the instance.<\/p>\n The\u00a0dbStats<\/strong>\u00a0command 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.<\/p>\n collStats<\/strong>\u00a0command is used to collect statistics similar to that provided by\u00a0dbStats<\/strong>\u00a0on the collection level, but its output includes a count of the objects in the collection, the size of the collection, the amount of disk space consumed by the collection, and information concerning its indexes.<\/p>\n The\u00a0replSetGetStatus<\/strong>\u00a0command outputs the status of the replica set from the perspective of the server that processed the command. This command must be run against the\u00a0admin<\/strong>\u00a0database in the followiing form.<\/p>\n In this addition to the above utilities and database commands, you can also use supported third party monitoring tools either directly, or via their own plugins. These include\u00a0mtop<\/a>,\u00a0munin<\/a>\u00a0and\u00a0nagios<\/a>.<\/p>\n For more information, consult:\u00a0Monitoring for MongoDB Documentation<\/a>.<\/p>\n That\u2019s it for now! In this article, we have covered some useful monitoring utilities and database commands for reporting statistics about the state of a running MongoDB instance. Use the feedback form below to ask any questions or share your thoughts with us.<\/p>\n <\/p>\n<\/div>\n1. Mongostat<\/h3>\n
$ mongostat -u \"root\" -p '=@!#@%$admin1' --authenticationDatabase \"admin\"\r\n<\/pre>\n
\n![\"Monitor](\"https:\/\/www.tecmint.com\/wp-content\/uploads\/2018\/07\/Monitor-MongoDB-Performance.png\")
<\/a><\/p>\n$ mongostat --help \r\n<\/pre>\n
2. Mongotop<\/h3>\n
$ mongotop -u \"root\" -p '=@!#@%$admin1' --authenticationDatabase \"admin\"\r\n<\/pre>\n
\n![\"Monitor](\"https:\/\/www.tecmint.com\/wp-content\/uploads\/2018\/07\/Monitor-MongoDB-Activity.png\")
<\/a><\/p>\n$ mongotop --help \r\n<\/pre>\n
3. serverStatus Command<\/h3>\n
$ mongo -u \"root\" -p '=@!#@%$admin1' --authenticationDatabase \"admin\"\r\n<\/pre>\n
>db.runCommand( { serverStatus: 1 } )\r\nOR\r\n>db.serverStatus()\r\n<\/pre>\n4. dbStats Command<\/h3>\n
>db.runCommand({ dbStats: 1 } )\r\nOR\r\n>db.stats()\r\n<\/pre>\n5. collStats<\/h3>\n
>db.runCommand( { collStats : \"aurthors\", scale: 1024 } )\r\n<\/pre>\n6. replSetGetStatus Command<\/h3>\n
>db.adminCommand( { replSetGetStatus : 1 } )\r\n<\/pre>\n