A couple more articles I saw posted out on the web on Sun’s new SSD offerings.  In the The official press release…  their are very scant details on the sun offerings right now.  But the official release says:

“Sun is already shipping Solaris ZFS software optimized for SSD technologies through the OpenSolaris(TM) community and is the first major systems vendor to add an end-to-end Flash-based disk product line to its portfolio, leapfrogging competitors and giving customers 3x better performance at one-fifth the energy consumption of traditional spinning disk offerings.”

Hopefully I am misreading this… 3X performance seems slower then the other SSD I have looked at.

In …

Properties:

Description:

If you have slow query logs enabled (with --log-slow-queries), this variable will help interpret all those queries that are not using indexes as slow queries.

Usage:

While …

Properties:

Description:

Starting with 5.1.5, MySQL has implemented ROW based replication format which logs the physical …

Properties:

Description:

This variable changes the way InnoDB open files and flush data to disk and is should be considered as very important for InnoDB performance. By default, InnoDB uses …

Properties:

Description:

This option, currently available only for Linux, if set enables the usage of large pages by MySQL. Many operating systems/system architectures support optional memory pages bigger than the default size (4 KB). Usually the large page size is 2 MB, this …

With all due respect to the technology and it's advocates (myself included), after a surge in articles describing the merits of using memcached I'm just pushing a thought breakpoint for developers to think whether they actually need it or not?

Recently, I ran into cases where the developers have decided to use memcached over MySQL style architecture after reading some/many good/nice articles about it without giving a damn to their requirements. I would like to list few things as a checklist for developers to decide on their architecture. There is still no precise answer but sometimes few cases can be just ruled out :).

1. What is the total size of your data? It might be a possibility that you can keep the data in memory in each node, or MySQL can just keep the whole thing (data+indexes) in a buffer.
2. How frequently your data is updated? Very frequent updates may lead to low cache hit ratio for memcached …

MySQL has a handy feature, that allows you to turn an INSERT into an UPDATE if a unique or primary key duplication is detected:

http://dev.mysql.com/doc/refman/5.1/en/insert-on-duplicate.html

A common usage pattern for this is “lazy initialization“ of a row in a database, which is exactly what my team was using it for yesterday to solve a problem in the backend for version 2.0 of the MySQL Enterprise Monitor. However, we ran into an issue where Hibernate would throw an exception complaining that when the INSERT was turned into an UPDATE, it couldn‘t retrieve the generated primary key value (we are using auto increments on this particular table, as it‘s not a high insertion-rate table).

To understand why this happens, you have to know a little bit about how Statement.getGeneratedKeys() works with MySQL‘s JDBC driver. …

I am, for the most part, a do-it-yourself type of person. I fix my own car if I can; I even have four healthy tomato plants growing in pots outside as we speak — the plants will take that little extra CO2 out of the air and give me great tasting tomatoes (soon… i hope!)

But I digress.

Whether to use an ETL tool such as Kettle (aka Penatho Data Integration) for a project involving large data transfers is a typical “build vs. buy” type of decision, one that is fairly well understood and I don’t wish to repeat it all here — putting together some Perl scripts to do the job, you typically get great performance, development speed and accessibility. This would need to be balanced against the benefits of ETL tools and their potential drawbacks (development speed, license costs and performance …

The video of one of my three sessions, "Optimizing MySQL and InnoDB on Solaris 10 for World's Largest Photo Blogging Community", presented at MySQL Conference & Expo 2008 has been uploaded by Sheeri. I am very thankful to her for doing all the hard work and making it available.

There are a few slides that were edited out of video because of reasons beyond my control. However, you should still be able to enjoy most of the video.

There is one point related to this video that I would like to make: Based on my particular experience I was leading to believe that Solaris 10 Kernel had the same …

I just made my reservations to attend Velocity Conference in Burlingame, CA. Velocity is a new two day conference being organized by O'Reilly. I was happy to learn at Lunch today that one of my good friends from CafeMom will also be attending. Over at Facebook I see Don McAskill has RSVP'd for the event as well.

Jesse Robbins, chair for Velocity conference graciously provided a 20% discount coupon as a comment on my blog post.

The early registration is about to end, but I find it really interesting that many slots still mention TBC (to be confirmed). I would have expected the schedule to …