{"id":492,"date":"2012-12-04T17:09:35","date_gmt":"2012-12-04T22:09:35","guid":{"rendered":"https:\/\/www.inmotionhosting.com\/support\/2012\/12\/04\/create-mysql-query-monitoring-bash-script\/"},"modified":"2021-08-16T23:27:34","modified_gmt":"2021-08-17T03:27:34","slug":"create-mysql-query-monitoring-bash-script","status":"publish","type":"post","link":"https:\/\/www.inmotionhosting.com\/support\/server\/databases\/create-mysql-query-monitoring-bash-script\/","title":{"rendered":"Create MySQL query monitoring bash script"},"content":{"rendered":"

In this article we’ll discuss how you can configure a simple bash script to check on your MySQL query activity to ensure that long queries are not hanging on your server. This script will also be able to e-mail you a notice when it has encountered a long running query.<\/p>\n

In most cases a MySQL database query should be able to execute within a few seconds, if for some reason it takes longer than that, there could be a possibility of a long running MySQL query backing up that database queue and leading to your server slowing down, and possibly becoming unstable.<\/p>\n

For more information on types of MySQL usage problems you can read about excessive MySQL activity<\/a>.<\/p>\n

This script can only be setup on a VPS or dedicated server hosting plan that you have root access<\/a> to.<\/p>\n

Create MySQL query monitoring script<\/h2>\n
    \n
  1. Depending on the complexity of your database, how many websites you run, and how much traffic you get, the max amount of time that you’d like to allow a query to run could be different. I would recommend starting off with something conservative around 120 seconds or 2 minutes, and if you’re logging in to your server after being alerted and it seems to still be running stable, you could probably increase the trigger level to something higher.Start editing a new file for the bash MySQL query alert script, in this case I’ll be using the vim<\/strong> text-editor and making a new file called MySQLMon<\/strong> in my user’s home directory with the following command:vim \/home\/userna1\/MySQLMon<\/code>Then you’ll want to hit i<\/strong> to enter Insert<\/strong> mode once vim is loaded up and enter in the following code:
    \n#!\/bin\/bash trigger=120 activeQcount=`mysql -e \"show full processlist;\" |
    \negrep -v \"leechprotect|root|Time\" | awk -v T=$trigger '{ if ( $6 > T ) print $0}' |
    \nwc -l` if [ $activeQcount -gt 0 ] then echo
    \n\"=====================================================================================\" >
    \n\/tmp\/MySQLMon echo \"= MySQLMon has found a new query running for longer than 120 seconds (2 mins)\"
    \n>> \/tmp\/MySQLMon echo
    \n\"=====================================================================================\" >>
    \n\/tmp\/MySQLMon date >> \/tmp\/MySQLMon echo \"\" >> \/tmp\/MySQLMon mysql -e \"show full processlist;\"
    \n>> \/tmp\/MySQLMon echo
    \n\"=====================================================================================\">>
    \n\/tmp\/MySQLMon cat \/tmp\/MySQLMon | awk -v T=$trigger '{ if ( $6 > T ) print $0}' |
    \nmail -s\"Caught query running longer than $trigger seconds\" recipient@Domain.com -- -r
    \n\"MySQLMon@Domain.com\" fi<\/code>
    \nThis code can look a bit overwhelming at first, but broken down it’s really quite simple. First we are declaring a trigger<\/strong> variable and setting that to 120<\/strong> seconds. Then we are setting an activeQcount<\/strong> variable to basically hold any queries that are longer than our trigger<\/strong> value.<\/p>\n

    We then use a bash if<\/strong> statement to check if our activeQcount<\/strong> value is above zero, showing that there are queries running longer than our set trigger<\/strong> value. Next we simply start echo’ing<\/strong> text into a placeholder file called \/tmp\/MySQLMon<\/strong>, then finally we cat<\/strong> that placeholder file which just reads it out and then we pipe it |<\/strong> to the mail<\/strong> function followed by a subject we’d like to use, the recipient’s address, then you can enter in — -r<\/strong> followed by the email address you’d like the message to come from.<\/li>\n

  2. When you receive an e-mail alert it will look much like this example:
    \n
    \n======================================================================================
    \nMySQLMon has found a new query running for longer than 120 seconds (2 mins)
    \n=====================================================================================
    \nTue Dec 4 15:07:42 EST 2012 40901 userna1_phpb1 localhost userna1_phpb1 Query 342
    \nSending data
    \nINSERT INTO users (userID, name, base64_decode)
    \n=====================================================================================<\/code><\/li>\n<\/ol>\n

    Setup cron job to run MySQLMon script<\/h2>\n
      \n
    1. Now you should have your MySQL query monitoring bash script setup, next you’ll want to create a cron job to run this task. If you’re unframiliar with cron jobs you can read about how to run a cron job<\/a>.You can use the cPanel drop-down for every 5 minutes, which should make the final cron job looking like:*\/5 * * * * bash \/home\/userna1\/MySQLMon<\/code><\/li>\n<\/ol>\n

      You should now have successfully setup a bash script to monitor your MySQL queries to catch any long running ones, and to alert you via e-mail when it catches any. You should also know how to setup a cron job to run that script on a set interval so that it will constantly run without further manual intervention from yourself.<\/p>\n","protected":false},"excerpt":{"rendered":"

      In this article we’ll discuss how you can configure a simple bash script to check on your MySQL query activity to ensure that long queries are not hanging on your server. This script will also be able to e-mail you a notice when it has encountered a long running query. In most cases a MySQL Read More ><\/a><\/p>\n","protected":false},"author":57014,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4305],"tags":[],"class_list":["post-492","post","type-post","status-publish","format-standard","hentry","category-databases"],"acf":[],"yoast_head":"\nCreate MySQL query monitoring bash script | InMotion Hosting<\/title>\n<meta name=\"description\" content=\"In this article we'll discuss how you can configure a simple bash script to check on your MySQL query activity to ensure that long queries are not hanging on your server. This script will also be able to e-mail you a notice when it has encountered a long running query.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.inmotionhosting.com\/support\/server\/databases\/create-mysql-query-monitoring-bash-script\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Create MySQL query monitoring bash script | InMotion Hosting\" \/>\n<meta property=\"og:description\" content=\"In this article we'll discuss how you can configure a simple bash script to check on your MySQL query activity to ensure that long queries are not hanging on your server. 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