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Displaying posts with tag: coding (reset)
kill, exit(), _exit() and issues getting gcov results


We are currently running code coverage for MySQL Cluster testing and have hit a few bumps along the road when it cam to collecting the "block" coverage for the NDBD.

I wanted to share them here for others that might run into similar frustrations when doing testing code coverage.

Gcov accumulates during each run information on which functions and lines of code are called and a total for the times called.

The problem comes from when gcov dumps this information out. The actual data is dumped on the "exit" of the program.

After much time tracking this issue down, it turns out that the NDBD code had been changed to use _exit() instead of just exit()

What is the difference?

Terminate the process after cleanup.

Terminate process immediately.

So by calling _exit(), gcov never had a …

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Give and Take

Have you ever looked at the source code of MySQL Workbench? There are quite some hidden gems there, e.g. the OpenGL canvas and our latest addtion: a new UI port of the famous open source edit control Scintilla. This port allows us to use this fantastic editor control natively on Mac OS X Leopard as a Cocoa framework.

In fact, we are using Scintilla for a long time already, mainly on Windows. It allows us to give you a powerful editor interface for SQL code. This includes features like syntax highlighting, text markers (e.g. for marking syntax errors), code folding, code completion and many more. However, so far we could not use it on OS X. There is a Carbon port available, but that did not work well (particularly, if the rest of the UI is using Cocoa) so we decided to write our own …

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Formatting mysqladmin extended-status nicely

I always say that the ultimate MySQL tuning script is an expert human. To that end, I generally try to build tools that help a human be more productive with the raw information from MySQL. One of the things we look at during a performance audit is the MySQL status counters. It’s useful to look at a) absolute values and b) several incremental snapshots. I’ve written a small shell script called “mext” that can make this a little easier.

It looks like this:

baron@kanga:~$ mext -- mysqladmin ext -ri1 -c3
Aborted_clients                               1      0      0
Aborted_connects                              0      0      0
Binlog_cache_disk_use                         0      0      0
Binlog_cache_use                              0      0      0
Bytes_received                             1167     35     35
Bytes_sent …
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Join the MySQL Workbench Team!

If you are a Mac developer, interested in a new professional challenge and like what we have done with MySQL Workbench so far, please consider applying for our open position in the Workbench team.We are looking for an Objective-C / UI coding wunderkind who is also not easily scared by C++.

You can be located anywhere around the world, only hard requirements are that you are comfortable with working from home, have a decent internet connection and are not too far from an airport.We would be happy to have you on the team.

More details about the job below. To speed up the hire process please send your CV to We are preferring people with open source background so please do not forget to include links to your open source work.

Job Summary:

Sun Microsystems is looking for a strong Mac UI developer with in-depth knowledge of Objective-C, C++, X-Code and the …

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A review of SQL and Relational Theory by C. J. Date

SQL and Relational Theory

SQL and Relational Theory How to Write Accurate SQL Code by C. J. Date, O’Reilly 2009. Page count: 266 pages of “real” text, plus hefty appendixes. (Here’s a link to the publisher’s site: SQL and Relational Theory How to Write Accurate SQL Code).

This is a very important book for anyone involved with databases. Before I say why, I need to apologize to Mr. Date. I tech-reviewed part of the book and did not care for it. I am afraid I was quite a curmudgeon in my review comments. So, Mr. Date, if you’re reading this — I want to say I …

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Google Summer of Code 2009

The time is just running and it's already time, again, for students to apply for this year's Google Summer of Code program. PHP and MySQL are among the list of 150 participating organizations. So if you're a student and are interested to learn how OpenSource works, do some networking with some famous people or just want a Google T-Shirt it's your time to take a look at the different idea pages (PHP, MySQL, others) or come up with an own idea and apply. Oh if accepted you even can earn some money as part of the program ...

Making Maatkit more Open Source one step at a time

If you’ve been holding out for that golden opportunity, now’s a great time to get involved in Maatkit.

Until now I haven’t really made a conscious effort to open-source the decision process and get people involved; Maatkit has been largely driven by so-called “real-world needs,” as perceived through my little lens on the world (and emails from the whole Percona team telling me when something’s wrong). I guess I am likely to remain some kind of benevolent dictator, because I created Maatkit and historically I’m the main hacker. But it doesn’t have to stay that way, and the project and users will be better off if it doesn’t.

So I’ve been trying to break out of the rut of just having some little email exchange with people using the tools, and bring things onto the …

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Python Scripting in Workbench

Python support has been added to the latest version of MySQL Workbench.

In addition to Lua, you can now write scripts and modules or interact with the GRT shell using the Python language. The integration allows you to use GRT objects and modules mostly in the same way you would do with normal Python objects. The built-in grt module contains everything related to the GRT that’s exposed to Python, including:

  • custom types for GRT lists, dicts and objects
  • wrappers for GRT classes, that can be used and instantiated as a normal Python class;
  • wrappers for registered GRT modules, that can be used like normal modules;
  • a reference to the root node of the GRT globals tree;

You can inspect these objects with the standard dir() command and in some cases with help(), to access the …

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MySQL University: Good Coding Style

This Thursday (March 5th, 14:00 UTC), Konstantin Osipov will give a MySQL University session on Good Coding Style. Konstantin is the lead of the server runtime environment team, and has been around at MySQL since 2003.

For MySQL University sessions, point your browser to this page. You need a browser with a working Flash plugin. You may register for a Dimdim account, but you don't have to. (Dimdim is the conferencing system we're using for MySQL University sessions. It provides integrated voice streaming, chat, whiteboard, session recording, and more.) All MySQL University sessions are recorded, that is, slides and voice can be viewed as a Flash movie (.flv). You can find those …

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MySQL Workbench - LUA-Script For Batch Renaming Of Foreign Keys

Yesterday there was a short discussion on our public IRC channel (#workbench on freenode). It was about how Workbench handles Foreign-Key-Names.

Especially if you intend to use Synchronization feature (available in SE edition only) its good to have names for FKs (and their coresponding Indices). Workbench does that by default if you’re using the Relationship-tools (Hotkeys 1 to 6 when canvas is focused). But if you prefer to create your FKs in a not-so-visual way (entering the values on the FK-Tab in the table-Editor) you are on your own when it comes to naming your FKs. Though Workbench initially only accepts creating keys after you typed a name into the name-field theres still the possibility to rename the FK later to even empty names. If you try to create empty named FKs on a MySQL Server the server will generate a name for the key.

If you want to change FK names later, when your model has already grown to a size, where …

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Showing entries 31 to 40 of 109
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