Ben Kaufman at SQLServerCentral introduces MySQL to the SQL Server DBA crowd. All in all his views seem to be fairly positive, in particular the MySQL Cluster experience:

NDB is the gem of MySQL, originally developed by Ericson to track cell phone calls this is a share nothing cluster engine stored in memory. This is a true cluster that supports both high availability and load balancing. [...]
This engine is similar to synchronous mirroring in SQL Server in that it is a 2-phase commit, the difference being the commit is done in memory at the data layer not the log. Logs are hardened at a later time, with the theory being that since data is committed on multiple nodes the data is safe and doesn't require a log flush as part of the transaction. [...]
For pure performance the cluster is comparable with a single instance of SQL Server. I've …

Ben Kaufman at SQLServerCentral introduces MySQL to the SQL Server DBA crowd. All in all his views seem to be fairly positive, in particular the MySQL Cluster experience:

NDB is the gem of MySQL, originally developed by Ericson to track cell phone calls this is a share nothing cluster engine stored in memory. This is a true cluster that supports both high availability and load balancing. [...]
This engine is similar to synchronous mirroring in SQL Server in that it is a 2-phase commit, the difference being the commit is done in memory at the data layer not the log. Logs are hardened at a later time, with the theory being that since data is committed on multiple nodes the data is safe and doesn't require a log flush as part of the transaction. [...]
For pure performance the cluster is comparable with a single instance of SQL Server. I've …

Dear LazyWeb, I want to use my Ubuntu laptop (on amd64 BTW) to build an RPM of Maatkit that will work on all RPM-based distros. Is it possible? Or are there enough differences between the RPM-based distros that I can’t do it? Mind you, the finished RPM ought to just have some man pages and Perl scripts, so I don’t think it will be platform- or distro-specific. But I am just not an expert on it.

The second question is, what do I need to put into my Makefile to do this? My ‘make all’ currently builds a .zip, a .tar.gz, and a .deb package — what needs to change to make that include .rpm?

Someone who is willing to help create .spec files, etc, etc will be immediately given commit rights to Maatkit’s SVN repository!

Debian, packaging, …

Introduction

The purpose of this document is to explain the power-efficeincy analysis proess, power-efficiency issues and solutions in MySQL database server as an example to help identify the right tools and procedures that support the development of energy-efficient application.

Analysis Process

1. Install and start test application(MySQL) on idle system, create workload to simulate the scenario that multiple concurrent clients connecting to the MySQL server without executing any queries.

2. Run PowerTop on Solaris to see how much time the CPUs are spending running in lower power states, and how much time the CPU are spending running in C0 state(meaning CPU is actually executing instructions.)

3. Use DTrace to profile application understand the source of the wakeups causing …

Want to know the type of an arbitrary expression in MySQL? Someday in the far far future in version 7.1, you might be able to with the TYPEOF() function.

For now you can try this:

Finally, the next release of version 5.0 is available on our download servers. During summer time, our release-cycle got a bit loose, but we’re about to tighten that again so the next release will hit the servers in less than a month again. 24 bugs were closed since release 5.0.23. Unfortunately one of the bugs discovered lately (and of course fixed in this release) was a bug in our auto-update module that could lead to a crash of Workbench when updater tried to close the running application. As a result, we had to deactivate automatic updates for versions < 5.0.24 so please fetch you copy manually this time via our download page. All customers of SE version please log into your account and download the updated SE package from there - sorry for the inconvenience.
The ongoing work on version 5.1 is making good progress, while we’re further decreasing the …

The InnoDB storage engine has done wonders for MySQL users that needed higher concurrency than MyISAM could provide for demanding web applications. And the automatic crash recovery is a real bonus too.

But InnoDB's performance (in terms of concurrency, not really raw speed) comes at a cost: disk space. The technique for achieving this, multiversion concurrency control, can chew up a lot of space. In fact, that Wikipedia article says:

The obvious drawback to this system is the cost of storing multiple versions of objects in the database. On the other hand reads are never blocked, which can be important for workloads mostly involving reading values from the database.

Indeed.

Imagine a set of database tables will tens of …

A system is not a system unless it can be monitored and controlled...I recall something like that from a university course in Control Theory.

However, in a couple of blogs from now on I am going to give some ideas on how to monitor and control MySQL Cluster. To control, we need to have process management software that automatically restarts processes.

To do monitoring we need to have a tool to collect information... and here is a new monitoring tool, called CMON (instructions further down). CMON aggregates information from MySQL Cluster that earlier was only accessible from the cluster log or the management client, such as:

• cluster state
• node state
• backup statistics
• statistics
• cluster events (cluster log basically)

.. and let's you access the …

Server monitoring is a big part of running a solid web site.  As an admin, you must know what is going on your server.  One of the tools most Linux/Unix admins are used to is called “top”.  “top” by itself is a very powerful tool.  Here is a quick guide on how to read output from top:  introduction to load averages under top.  It just makes sense that somebody went and created httptop to monitor http traffic.

Install perl modules:

install Term::ReadKey
install File::Tail
install Time::HiRes

Now copy paste the script below and save it in a location and set +x attribute on it so you can execute it.  On my …

Why generalizations about open source product usability don't apply to vendor-sponsored open source projects READ MORE