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Fun with Performance Schema
I'm using a very small MariaDB instance as a datastore for my YouLess energy monitor, my own mail server (postfix, roundcube). It's a virtual machine from a commercial VPS provider. All data fits in...
View ArticleOpen Source Certification , Friend or Foe
With 2 of the bigger Open Source projects I care about talking about certifications programs questions pop up again ... Should we certify ourselves ? So let me tell you about my experiences in getting...
View ArticleState of the MySQL forks - conclusions
I promised to still post some general comments about the MySQL ecosystem, to conclude my outlook of State of the MySQL forks and Drizzle. I will do this now in the form of answering questions I got in...
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Character sets in MySQL – still not for Windows users.
Recent MySQL versions (first the chaotic series of releases that preceeded 5.5 – 5.2, 6.0 and 5.4 – and now 5.6) adds new ‘character sets’ to MySQL. But little of it is useful. Let us take it from the...
View ArticleDatabase Marketing Manager Position Now Open at SkySQL
SkySQL is Looking for a Senior Marketing Manager for North America! If you or someone you know is looking for this kind of position, then this is a great opportunity. I’ll spare all of the details, but...
View ArticleMySQL kill could be so much more exciting
When I kill a query or connection, whoever is running it gets a boring message about what happens. Wouldn’t it be fun and useful to be able to specify the error message the user should see? Imagine the...
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How to create a MySQL bug report that someone would like to read and comment on
It happens to me almost every day. I note some "bug report" at http://bugs.mysql.com that makes me think that my job is miserable... Like this, Bug #66580. What readers of such a bug report are...
View ArticleDifferences between READ-COMMITTED and REPEATABLE-READ transaction isolation...
As an instructor with Percona I’m sometimes asked about the differences between the READ COMMITTED and REPEATABLE READ transaction isolation levels. There are a few differences between READ-COMMITTED...
View ArticleIdentifying and killing blocking transactions in InnoDB
The MySQL Server has a few options to help deal with transactions holding InnoDB locks for excessive periods of time. The –innodb-lock-wait-timeout option is one such option, but that just affects...
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MySQL Cluster: Troubleshooting Error 157 / 4009 Cluster Failure
Suddenly your application starts throwing "error 157" and performance degrades or is non-existing. It is easy to panic then and try all sorts of actions to get past the problem. We have seen several...
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Fetching rows as dictionaries with MySQL Connector/Python (revised)
It is possible with MySQL Connector/Python to define your own cursor classes. A very good use case is to return rows as dictionary instead of tuples. This post shows how to do this using MySQL...
View ArticleMySQL: Best of Breed Database
Oracle offers best of breed technology at every layer of the stack, from servers and storage to applications. Discover why MySQL is a best of breed database solution for: Web-based applications,...
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The real differences between READ-COMMITTED and REPEATABLE-READ transaction...
Justin Swanhart wrote a blog on Differences between READ-COMMITTED and REPEATABLE-READ transaction isolation levels and I thought I'd give my view on this issue.To begin with, from a technical...
View ArticleHere’s a quick way to Foresee if Replication Slave is ever going to catch up...
If you ever had a replication slave that is severely behind, you probably noticed that it’s not catching up with a busy master at a steady pace. Instead, the “Seconds behind master” is going up and...
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New plugin: Connection multiplexing with PHP and MySQL
Here comes the next open source mysqlnd plugin prototype: PECL/mysqlnd_mux. The PHP mysqlnd connection multiplexing plugin shares a connection to MySQL between multiple user connection handles....
View ArticleLoad-balanced JDBC Tip for GlassFish Deployments
Having supported a number of successful load-balanced JDBC applications using MySQL Cluster and MySQL Connector/J over the years, I’ve found a few problems that are unique to specific Java app servers....
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Revisiting libmysqld, the client / server overhead and all that. And an apology
I wrote about the performance gains with libmysqld a few days ago but I had just too many things in my head to do a proper comparison with the MySQL Cluster / Server protocol. Yes, libmysqld is faster,...
View ArticleMySQL Connector/Net 6.6.2 has been released
The 6.6 has reached Beta level major features are Stored routine debugger, Entity Framework 4.3 Migrations support, Authentication Plugin & Visual Studio 2012 support.PlanetMySQL Voting: Vote UP /...
View ArticleMySQL Proxy: 0.8.3 released
We are proud to announce the release of MySQL Proxy 0.8.3 (alpha) which updates MySQL Proxy for the protocol changes introduced in MySQL 5.5 and 5.6. All users of MySQL Proxy 0.8.x are recommend to...
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MySQL Cluster: Too many active scans
Continuing with another blog about troubleshooting MySQL Cluster we will look at a common error message: "Too many active scans".Now, you have already set MaxNoOfConcurrentScans=500 in your config.ini,...
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