ALL POSTS

Undocumented parameter _fix_control: How to break your database

Beware this parameter can prevent your database from starting. Indeed it can prevent your instance from starting! There are two dynamic views v$system_fix_control and v$session_fix_control which were introduced in 10.2 and control whether fixes for bugs in the optimizer can be turned on or off. This can also be controlled using the _fix_control initialization parameter. Also beware if setting this parameter in a running database. You can prevent further logins if you get it wrong or indeed try to unset it. Do not do. The moral of the story is be very careful with undocumented parameters when upgrading!

Introducing Pythian Europe

It is with great pride that I am able to announce that Pythian is making a large investment in Europe. As of this month, Pythian Europe s.r.o. is fully operational and we have headquartered the company in beautiful Prague. Additional offices are planned in Paris and Malta by the end of the summer.

Installing Oracle 11g on Ubuntu 8.04 LTS (Hardy Heron)

After our last post about installing Oracle 11g on Ubuntu 7.10 (November, 6th), and considering Ubuntu 8.04 LTS was released on April 21st, I spent some time reviewing and putting together this new HOWTO for the installation. Please note: I’ve used the x86 server version of Ubuntu 8.04, but the same steps should work without any problems for the Desktop version. Also notice that this whole procedure can easily take over six hours to complete, so don’t complain I didn’t warn you! So, let’s get started, shall we?

Oracle Application Server: How to Bounce AS from One Location

n this post and some upcoming posts, I’m going to write more about Oracle application servers, a subject we have addressed too little on the Pythian blog. In this post, I am addressing how to bounce a whole application server, including all tiers and databases from one location. The reason being, I have a request from a client to have the application server be bounced automatically during the weekend to release swaps and to address memory leaks.

Oracle RAC, v$, and gv$

I have experienced some pain at the hands of the Oracle RAC. My first encounter was about five months ago when I first became an “official” DBA. Being eager to jump into solving problems in my new job (as that’s what most DBAs do, solve problems), I relished the chance to get my hands dirty and work on a “real” DBA task — a database lock. Checking with a few knowledgeable co-workers, I was directed to a set of common database diagnostic scripts affectionately known as the “Pythian Kit”. his wasn’t the confidence-boosting exercise that I had anticipated.

[New England] NESQL Special Meeting, Featuring Craig Freedman

Next Thursday, May 8, the New England SQL Server Users Group will have a special meeting, featuring Craig Freedman from the SQL Server development team. At the meeting next week, Craig will discuss some of what he talked about in the chapter, including the basics of how the query processor works and what iterators are. He’ll cover the various operators you’ll commonly see in query plans, and describe how they actually work internally.This should be a great meeting, and we expect it to be very well attended. In order to help us figure out food and drink, in addition to securing enough chairs for the meeting room, we need you to RSVP if you’re planning to attend. In order to RSVP, sign up for our mailing list.

2008 MySQL Conference Videos, Notes, Slides and Photos!

All of the videos from the 2008 MySQL Conference have been processed and uploaded. Links to the videos, slides, notes, photos for each presentation are all on the mega-conference page linked to in this post. If you know of any video, audio, notes, slides, photos, etc that are not linked, please link them at the wiki page. If you can’t or won’t, please comment here and I will update the wiki for you.

MySQL Community Member of the Year Award Musings

By now it is no surprise that I won one of the three 2008 MySQL Community Member of the Year awards. I am going to detail in this blog post the secrets to my success. This year, I thought to myself, “how can I make it so I am not on this stage receiving this award next year?” So here is my challenge to you. I will open source my methods, and in return I will give $100 to each 2009 MySQL Community Member of the Year (in whatever form they want, whether it’s US cash, a $100 Amazon.com gift certificate, a donation to an organization, whatever).

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