how to determine the runtime and start time of a Linux process
Yesterday, I needed to determine the runtime of a Linux process for a monitoring script. Cos the format for start_time of the ps command may change if the process was not started in the same year, I...
View Articlehow to determine the runtime and start time of a Linux process
Yesterday, I needed to determine the runtime of a Linux process for a monitoring script. Cos the format for start_time of the ps command may change if the process was not started in the same year, I...
View ArticleMySQL queries with REGEXP
Official MySQL documentation provides information that using regular expressions is “powerful way of specifying a pattern for a complex search”. Is it really such a powerful way of filtering and should...
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21st century presentation technology at Percona Live
After 15 years of slide show technology, I thought that we need to change the way we do presentations. And since I am advocating radical changes, I will eat my own dog food and be the first to present...
View ArticleHow to find MySQL configuration file?
A customer called me today asking for help with locating the configuration file used by one of their production MySQL instances. From the description I was given it appeared that their server had at...
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Disproving the CAP Theorem
Since the famous conjecture by Eric Brewer and proof by Nancy Lynch et al., CAP has given the world countless learned discussions about distributed systems and many a well-funded start-up. Yet who...
View ArticleProgress on High Performance MySQL, 4th Edition
With the 3rd edition of High Performance MySQL finally complete, I’ve begun work on the 4th edition. As you know, technology moves much faster than printing presses, and a book is outdated very...
View Articlenew nagios / icinga plugin check_juniper_srx_ipsec_tunnel.pl
At the weekend I completed a new nagios / icinga plugin. The check_juniper_srx_ipsec_tunnel.pl plugin checks via SNMP the IPSec VPN / Tunnel State for a given VPN Gateway on a Juniper SRX gateway....
View ArticleShould RAID 5 be used in a MySQL server?
Usually the answer should be “no!”. RAID level 5 is hardly ever a good choice for any database storage. It comes with a very high overhead as each write turns into a sequence of four physical I/O...
View ArticleCan COUNT(*) be used in MySQL on InnoDB tables?
COUNT() function returns a number of rows returned by a query. In a popular opinion COUNT(*) should not be used on InnoDB tables, but this is only half true. If a query performs filtering on any...
View ArticleAnnouncing MariaDB 5.1.61 and 5.2.11
We are pleased to announce the immediate availability of MariaDB 5.1.61 and MariaDB 5.2.11. Both of these stable (GA) releases incorporate MySQL 5.1.61 and several bug fixes. Please see the What is...
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Speaking at Big Data in Stockholm
I will be spaking at the conference "Reality Check: Big Data" coming up on April 26 here in Stockholm. This is all about big data in in's different shapes, and the conference is run by Swedish Computer...
View ArticleHow to prevent swapping on a MySQL server?
Swapping occurs when system moves some data between memory and a special area on disk called swap space. The process is called swapping in or swapping out depending on the direction in which it...
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OLTP and OLAP – Have Your Cake and Eat it Too!
Looks like we’ll be having some more fun at the Percona Live MySQL Conference! In addition to our booth and my colleague Tim’s talk, my lightning talk was accepted. The title is “OLTP and OLAP – Have...
View ArticleDiamond Keynote Panel, BOFs, Lightning Talks, and McAfee and AOL Sponsorships
I’m excited by all of the recent developments surrounding the Percona Live MySQL Conference and Expo! Our own Baron Schwartz will moderate the Diamond Keynote Panel entitled “Future Perfect: The Road...
View ArticleYouTube Scalability Lessons
Very interesting blog post by Todd Hoff at highscalability.com presenting “7 Years of YouTube Scalability Lessons in 30 min” based on a presentation from Mike Solomon, one of the original engineers at...
View ArticleThoughts on using MySQL plugins
I'm giving thoughts on the viability of MySQL plugins. This is due to a particular experience I've had, which is thankfully solved. However, it left some bitter taste in my mouth. MySQL plugins are a...
View ArticleShinguz: FromDual Performance Monitor for MySQL (MPM) v0.9 released
On April 2nd 2012 FromDual released the new version v0.9 of its Performance Monitor for MySQL (mpm). The new version can be downloaded from here. The Performance Monitor for MySQL (mpm) is an agent...
View ArticleAnnouncement of Percona XtraDB Cluster 5.5.20 GA release
I am excited to announce the availability of the GA release of our new product Percona XtraDB Cluster. Percona XtraDB Cluster is a High Availability and Scalability solution for MySQL Users and is...
View ArticleWas a query served from MySQL Query Cache?
The MySQL query cache is a special buffer, where database stores the text of a SELECT statement together with the corresponding result that was sent to the client. For as long as no table that a...
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