I have been hearing about the Memcached UDF for MySQL for a while now, so I decided to spend some time playing with them. Being the geek I am, playing for me is to get my hands dirty with the code so I cloned the source repository from: http://hg.tangent.org/memcached_functions_mysql/.

With the source code and a cup of coffee available I ran:

trond@opensolaris:compile> ./config/bootstrap
trond@opensolaris:compile> ./configure CC=cc --with-myslq=/usr/mysql/bin/mysql_config
[... cut ...]
checking for DEPS... configure: error: Package requirements (libmemcached >= 0.17) were not met:
[... cut ...]
    

I know that there is a version of libmemcached in OpenSolaris (I was involved during the integration), so the version is either too old or configure isn't …

Lenz just posted pointers to a great presentation of his about MySQL HA and Drupal,

Seems like a small part of me did go to Szeged afterall :)

I finally got around to reading this update from Red Hat about Spacewalk, the open source version of Red Hat Network Satellite, launched in June.

Other than the progress in attracting participants and patches, the interesting news is that PostgreSQL support is being added after being demanded by the community. The roadmap confirms that work on support for PostgreSQL is scheduled to begin in mid-October.

The Path to PostgreSQL page, meanwhile, indicates that the idea will enable Red …

UPDATE Log4LUA 0.2 released. Go to the project page.

After the dust about backend connection handling in MySQL Proxy had settled, I begun working on other parts of HSCALE again. (I’ll return to the backend handling later after talking to Jan Kneschke about their plans.)

One of the issues that bothered me the most was logging. Until now I just had used a simple debug function that could be enabled or disabled using an environment variable. The pretty straightforward approach a lot of people use. But there is more to logging than to print debug messages. So I searched the web and of course I found …

Features:
* CPU optimisations in both MONyog (server) process (in particular when ‘Monitors/Advisors’ page was being viewed) and browser processes (viewing Dashboard could cause high CPU usage in Firefox browser in particular).

Bug fix:
* Fixed a dependency with the SSH library that could cause failure to install in Win2K. This was an issue with the updated SSH library introduced with version 2.5.

Miscellaneous:
* The RPM installer scripts for Linux were updated in various ways. This solves issues on specific distributions including: 1) uninstall with the SuSE/YaST ’software management’ GUI was not possisble. 2) It was not always possible to install on top of a running MONyog service - sometimes it was necessary to stop service manually before upgrading. Also note: when updating from trial to single/multi server or from single server to multi server it …

Part 1 covered Network Edition backup features, today’s snips apply to all editions.

First among the lesser known additions: We recently provided the possibility for a nice performance boost to some environments by adding the ability to turn on batched indexing in ZCS 5.0.3 (you can even fine tune it at the localconfig, COS, and account level). We’re not talking about when you re-index an entire account here, this is a change to the index-as-received model; now new items can sit in a ‘queue’ (really a ‘indexing deferred’ flag on the mail_items table of the pertaining mboxgroup database in MySQL) to run all at once when it reaches the zimbraBatchedIndexingSize threshold, saving you from all the tiny disk thrashing. It might not be …

Watch for Zend, MySQL, Asterisk, PHP and Apache conferences coming to a city near you! READ MORE

I met GNU for the first time fifteen years ago. I was working as a consultant in support of a criminal investigation, and as part of my duties I had to analyze a database hosted on a SCO server.
As often happens, the database was proprietary, and it did not include any facility to analyze data. I needed to build an application to explore the data thoroughly.
Most of my working libraries were written in C, which I used in other operating systems. So I contacted SCO and asked to buy a C compiler. I was told that it would cost me quite a lot (I was prepared for that, although not for the price they told me, but since I was going to expense it, I would not care), and that it would take one month to get the software. I did not have one month at my disposal. I needed to nail down the evidence for the investigation immediately. So I started asking around. I was doing some side work for …

I've made a patch that makes EXPLAIN show conditions that are attached to various points of the query plan. If you run EXPLAIN CONDITIONS (or EXPLAIN CONDS) statement, the output besides the usual EXPLAIN resultset will have a second resultset that will show

• Conditions attached to individual tables
• Conditions that are applied before/after join buffering
• Table and index conditions that were pushed down into the storage engine
• ... and so forth (I believe it prints out all possible conditions that are there)

It looks like this:

mysql> explain conds select * from City, Country where City.Country=Country.Code and City.Name like 'C%' and Country.Continent='Asia' and Country.Population>5000000;
+----+-------------+---------+------+-------------------+-----------+---------+-----------------+------+------------------------------------+
| id | select_type | table   | type | …

Tuning MySQL Performance with MySQLTuner

MySQLTuner is a Perl script that analyzes your MySQL performance and, based on the statistics it gathers, gives recommendations which variables you should adjust in order to increase performance. That way, you can tune your my.cnf file to tease out the last bit of performance from your MySQL server and make it work more efficiently.