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Displaying posts with tag: pt-stalk (reset)
Percona Toolkit and systemd

After some recent work with systemd I’ve realized it’s power and I can come clean that I am a fan. I realize that there are multitudes of posts out there with arguments both for and against systemd but let’s look at some nice ways to have systemd provide us with (but not limited to) pt-kill-as-a-service.

This brief post introduces you to a systemd unit file and how we can leverage them to enable pt-kill at startup, have it start after mysqld and ensure that MySQL is running by using the mysql service as a dependency of pt-kill. By using systemd to handle this we don’t have to complicate matters by ‘monitoring the monitor’ using hacky shell scripts, cron or utilities like monit.

So then, a quick primer on systemd, because lets face it, we’ve all been avoiding it. Systemd is not new but it made recent headlines in …

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Calling all MySQL DBAs: How do you use Percona Toolkit?

Percona Toolkit is one of our most mature open source applications. Derived from Maatkit and Aspersa, Percona Toolkit has evolved significantly over the years. The software now contains 32 tools, over 4,000 tests, and has been downloaded over 250,000 times. Anyone who manages a database – from DBAs to system administrators to even software developers – benefits from Percona Toolkit’s ability to perform a variety of MySQL server and system tasks that are too difficult or complex to perform manually.

We continue to make Percona Toolkit better each month. Over the last 9 months alone Percona has had 6 releases and resolved nearly 50 issues.

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Percona Toolkit 2.2.11 for MySQL is now available

Percona is pleased to announce the availability of Percona Toolkit 2.2.11.  Released on Sept. 25, Percona Toolkit is a collection of advanced command-line tools to perform a variety of MySQL server and system tasks that are too difficult or complex for DBAs to perform manually. Percona Toolkit, like all Percona software, is free and open source.

This release contains bug fixes for pt-query-digest, pt-mysql-summary, pt-stalk, as well as other tools and is the current GA (Generally Available) stable release in the 2.2 series. Downloads are available here and from the  …

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Hunting for “Locked” queries with pt-stalk utility

Recently we faced an issue when Nagios reported significant amount of “Locked” queries.
To investigate and debug the issue we needed to get more insight about the state of MySQL and the OS at the time the locks occurred.
This is how we got the much needed information:

wget -O pt-stalk
chmod +x pt-stalk
mkdir -p /tmp/pt-stalk
sudo pt-stalk --daemonize --notify-by-email <EMAIL> --log /tmp/pt-stalk/pt-stalk.log --user root --dest /tmp/pt-stalk --function processlist --variable State --match Locked --threshold 20 --cycles=10 --sleep=15 --run-time=15

In this case we are running pt-stalk utility in background and trying to catch the case when there are 20+ Locked queries in processlist. When a match occurs, pt-stalk will collect a lot of OS and MySQL info and notify us by email.

5 Percona Toolkit Tools for MySQL That Could Save Your Day: April 3 Webinar

On April 3 at 10 a.m. PST, I’ll be giving a webinar titled “5 Percona Toolkit Tools for MySQL That Could Save Your Day.” In this presentation you’ll learn how to perform typical but challenging MySQL database administration tasks.

My focus will be on the following tools:

  • pt-query-digest, to select the queries you should try to improve to get optimal response times
  • pt-archiver, to efficiently purge purge data from huge tables
  • pt-table-checksum/pt-table-sync, to check if data on replicas is in sync with data on the master
  • pt-stalk, to gather data when performance problems happen randomly or are very short
  • pt-online-schema-change, to run …
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Percona Toolkit by example – pt-stalk

pt-stalk recipes: Gather forensic data about MySQL when a server problem occurs

It happens to us all from time to time: a server issue arises that leaves you scratching your head. That’s when Percona Toolkit’s pt-stalk comes into play, helping you diagnose the problem by capturing diagnostic data that helps you pinpoint what’s causing the havoc hitting your database.

From the documentation (

pt-stalk watches for a trigger condition to become true, and then collects data to help in diagnosing problems. It is designed to run as a daemon with root privileges, so that you can diagnose intermittent problems that you cannot observe directly. You can also use it to execute a custom command, or to gather the data on demand without waiting for the trigger to happen. …

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RainGauge, the new killer tool ?

I’m sure you’ve heard of Box Anemometer from the Box (MySQL) team, an excellent UI tool based on pt-query-digest. Now the guys from the box team offer us another killer UI tool based on pt-stalk, and I’m sure you will really appreciate to use it !

What is it ?

RainGauge” consists of three parts :

  • A set of scripts that collect data about the health of your system and your databases (based on pt-stalk)
  • A process that push these data on a centralised place
  • A very simple interface to navigate in the collected data

But the collection begins only when specific conditions are triggered, and you choose what these conditions are. Find below the general flowsheet :

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Showing entries 1 to 7