You might have noticed that this blog changed name and URL. Instead of having one single blog for everything, I decided to split my blogging activities in two separate blogs.

If you're interested in MySQL, Oracle, Databases, Business Intelligence, Open Source, Cloud, etc. this is the place to be. Blog's new name is Data & Co.
A big "Thank you!" to David Stokes who moved all the planet.mysql.com references to the old blog to this new one.

On the other hand, if you'd like to read about communication, marketing, advertising, PR, soft skills, etc. feel free look at Publicime.  Please see the introduction of my new blog …

If you’ve been tuning your MySQL database and have wondered what effect the innodb_flush_method settings have on write performance, then this information might help. I’ve recently been doing a lot of baseline load tests to show performance differences between localdisk and the new SAN we’re deploying. Since we run InnoDB for everything in production, and writes are very heavy, I decided to run comparison tests between two identical servers to find the best setting for innodb_flush_method. We have the following specs for the hardware:

• Dell R610
• 24 core Intel Xeon X5670 @ 2.93ghz
• 72GB ECC RAM
• Brocade 825 HBA
• Local disk: RAID-10 15K SAS Ext3 (ugh)
• SAN: Oracle 7420 with four Intel Xeon X7550 @ 2.00GHz, 512GB RAM, 2TB read-cache(MLC-SSD), 36GB write cache (SLC-SSD), 3 disk shelves populated with 60x2TB 7200RM SATA drives setup in mirrored format with striped …

In my opinion, The Server Option and Variable Reference at http://dev.mysql.com/doc/refman/5.5/en/mysqld-option-tables.html rates as my most important page. This is a consolidated index that enables a drill down to the Server Command Options, System Variables, Startup and replication specifics, as well as important information on default values and differences between versions including point releases.

However, there is another page not in the actual manual, but at http://dev.mysql.com/doc/mysqld-version-reference/en/mysqld-version-reference-optvar.html which is an Options/Variables reference akin to the Reference Manual, but includes a 5.x version matrix.

Recently I was asked about some options that had to be …

I see so many posts on what happened to company X, product Y and dream Z that I couldn't resist the temptation to summarize this great year for MySQL. At the end of 2010, Oracle did an announcement we were all waiting for: MySQL 5.5 is GA! Another year has passed since then and it's time to reflect on what has been done.

I know this is a long post. I tried to rewrite it at least 10 times to make it shorter, but I couldn't condense the list. Hence, I wrote a summary in the beginning for those who don't want to read it all.

I believe that 2011 was an exceptional year for MySQL and I really enjoy being part of this team. I wish all of us a lot of success and fun in the years to come!

Summary:
Oracle released many  …

When using the replication slave stream, or mysql command line client and mysqlbinlog output from a binary/relay log, all statements are executed in a single thread as quickly as possible.

I am seeking a tool to simulate the replay of the binary/relay log for a benchmark at a pace that is more representative to original statements. For a simple example, if the Binary Log has 3 transactions in the first second, 2 transactions in the second second, and 5 transactions in the third second, I am wanting to simulate the replay to take roughly 3 seconds, not as fast as possible (which would be sub-second). The tool should try to wait the remainder of a second before processing SQL statements in the incoming stream.

Does anybody know of a tool that currently provides this type of functionality? Any input appreciated before I create my own.

For a work project, I wrote a library in perl that can be used to query the NVD feed that NIST publishes here:

http://nvd.nist.gov/download.cfm

Here’s a snippit from the perldoc:

use NIST::NVD::Query;
 
# use convert_nvdcve to generate these files from the XML dumps at
# http://nvd.nist.gov/download.cfm
 
my( $path_to_db, $path_to_idx_cpe ) = @ARGV;
 
my $q = NIST::NVD::Query->new( database => $path_to_db,
                               idx_cpe  => $path_to_idx_cpe,
                              );
 
# Given a Common Platform Enumeration urn, returns a list of known
# CVE IDs
 
my $cve_id_list = $q->cve_for_cpe( cpe => 'cpe:/a:zaal:tgt:1.0.6' );
 
my @entry;
 
foreach my $cve_id ( @$cve_id_list ){
 
  # Given a CVE ID, returns a CVE entry
 
  my $entry = $q->cve( cve_id => …

I am Cloud Camp in Stockholm today. Some interesting ideas are bounced around, pretty cool stuff.

One thing hit me today though: the lack in innovation, in IT as a whole and in databases in particular is stunning. I have thus decided to write a few blogpost on this I think should, and probably eventually has to change, but noone wants to change it, and few even see it as a problem.

That said, I still got a few interesting ideas today, and I will test some products I saw here, and I will write a few blogpost on some of them.

I think the good usecases for clouds is also getting clearer, and that is a good thing. In difference to the current IT trends, IT press and many high-profile bloggers as well as IT influencers, I do not think that cloud computing will help resolve the conflict in the middle east. Also, I do not believe that the introduction of …

Following a heavy schedule in the last month speaking in Tokyo, Beijing, Manila and Auckland it is nice to be on home soil for upcoming speaking. I will be in Denver, Colorado for RMOUG 2012 from February 14-16, 2012 where I will be speaking about the essentials of MySQL security.

I hope to also organize another presentation in the area for the local MySQL users group. More to follow.

And a friendly reminder, the annual MySQL conference is on again, same place (Santa Clara), same dates …

Topics for this podcast:

*Continuent extends MySQL replication to Oracle Database
*CFEngine updates server automation software
*Devops moving mainstream
*Neo Technology integrates with Spring
*451 CAOS report from Hadoop World

iTunes or direct download (26:56, 4.6MB)

I want to keep a record of the configuration of the MySQL servers I manage. The configuration of some servers differs from others and over time the configuration may vary, partly as a result of upgrades in the mysql version or the use of the particular mysql instance, so tracking this is important.

Configuration items in MySQL can be thought of in 2 separate parts: the static configuration files which determine the behaviour of the server when it starts up (my.cnf) and the running configuration of the server in question. The latter information is usually obtained by running SHOW GLOBAL VARIABLES and SHOW SLAVE STATUS if the server is a slave.

I’d also like to compare the 2 sets of configuration so I can see if a local change has been made to the running server which is not reflected in its configuration file. I might want to correct this, or at least be aware of it.

However, collecting and …