There are many reasons for wanting a small MySQL database server: You’re a uni student who wants to learn the SQL language better and needs a mini-testbox You’re a Windows user who wants to play around with Percona Server on Linux You’re a corporate application developer who wants a small SQL development & test box [...]
Percona Server on the Raspberry Pi: Your own MySQL Database Server for Under $80
February 25, 2013 By 10 Comments
How to use a smartphone for two-factor authentication with Percona Server for MySQL
February 24, 2013 By Leave a Comment
In this post I will describe a non-trivial way to authenticate users in Percona Sever for MySQL. Percona Server comes with PAM authentication plugin, which allows you to do a lot of cool things, such as: OS authentication, LDAP authentication, even RSA Secure Server authentication (which is useful if you are required a PCI-compliance), and [...]
Solving RPM installation conflicts in CentOS 5 and CentOS 6
February 21, 2013 By 6 Comments
Lately we’ve had many reports of the RPM packages for CentOS 5 (mostly) and CentOS 6 having issues when installing different combinations of our products, particularly with Percona Toolkit for MySQL. Examples of bugs related to these issues are lp:1031427 and lp:1051874. These problems arise when trying to install a package from the distribution that [...]
Using MySQL Sandbox with Percona Server
February 16, 2013 By 3 Comments
One of the most useful tools if you’re working with multiple versions of MySQL Servers is MySQL Sandbox which allows you to maintain many different versions of MySQL, Percona Server, MariaDB. If you’re just working with single sandbox you can just use MySQL Sandbox in its most basic way and it will work:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | root@smt2:~/sandboxes# make_sandbox /tmp/Percona-Server-5.5.29-rel29.4-401.Linux.x86_64.tar.gz unpacking /tmp/Percona-Server-5.5.29-rel29.4-401.Linux.x86_64.tar.gz Executing low_level_make_sandbox --basedir=/tmp/5.5.29 \ --sandbox_directory=msb_5_5_29 \ --install_version=5.5 \ --sandbox_port=5529 \ --no_ver_after_name \ --my_clause=log-error=msandbox.err ... no_run = no_show = do you agree? ([Y],n) Y loading grants ... sandbox server started Your sandbox server was installed in $HOME/sandboxes/msb_5_5_29 |
However [...]
Can’t Create Thread: Errno 11 (A Tale of Two Ulimits)
February 4, 2013 By 10 Comments
Recently some of my fellow Perconians and I have noticed a bit of an uptick in customer cases featuring the following error message:
1 2 | SQLSTATE[HY000] [1135] Can't create a new thread (errno 11); if you are not out of available memory, you can consult the manual for a possible OS-dependent bug. |
The canonical solution to this issue, if you do a bit of Googling, is to increase the number of processes / threads available to the MySQL user, typically by adding a [...]
Announcing Percona XtraDB Cluster 5.5.29-23.7.1
January 30, 2013 By 8 Comments
Percona is glad to announce the release of Percona XtraDB Cluster on January 30th, 2013. Binaries are available from downloads area or from our software repositories. Bugs fixed: In some cases when node is recovered variable threads_running would become huge. Bug fixed #1040108 (Teemu Ollakka). Variable wsrep_defaults_file would be set up to the value in [...]
Profiling MySQL Memory Usage With Valgrind Massif
January 9, 2013 By 1 Comment
There are times where you need to know exactly how much memory the mysqld server (or any other program) is using, where (i.e. for what function) it was allocated, how it got there (a backtrace, please!), and at what point in time the allocation happened. For example; you may have noticed a sharp memory increase [...]
Percona Toolkit Webinar followup Q&A
December 19, 2012 By 1 Comment
First, a thank you to everyone who attended the webinar Today, I appreciate your time and nice comments. As promised, here are answers to questions that couldn’t be answered during the talk: Q: How do you install the tools? The manual has full details, but it’s important to know that the latest release for [...]
Percona Live London 2012: Percona XtraDB Cluster in a nutshell
November 30, 2012 By 1 Comment
On Monday I will deliver with Seppo Jaakola from Codership a tutorial on Percona XtraDB Cluster (Percona Server + Galera). Already in London and you don’t know how to consume the hotel’s bandwidth ? If you attend this tutorial, you can download the Virtual Box appliance we will use during the session.
Debugging MySQL SSL problems
November 8, 2012 By Leave a Comment
This is not necessarily going to be a comprehensive post, but I learned somethings about MySQL SSL today that I thought would be worth sharing. I was setting up a PRM install for a customer and one of the requirements was SSL replication. In this particular case, I had setup PRM first, and then was [...]
