Oracle RAC and gv$ Views: A Second Look

I decided to reprise my commentary on Oracle RAC and the gv$ views after reading Patrick’s comments on my previous post. It is always encouraging to know that someone is kind enough to read your work and provide insightful feedback – many thanks to him! There are two questions that I wanted to answer here: Can you use the gv$ views with a non-RAC environment? What do the WHERE clauses in a good block-checking script do?

Oracle 11G Result Cache in the Real World

As some of you probably already noticed, there was a thread on AskTom discussing the scalability tests I did back in 2007. You are welcome to read the entire thread, but in a nutshell, Tom Kyte claimed that my tests did not reflect how one would use the result cache in the real world. What is “real world?”

The Architecture Layer

Contemporary software engineering models include many loosely-defined layers. Database developers might help with other layers, but for the most part a database administrator’s domain is the persistence layer. The Daily WTF has an article on The Mythical Business Layer makes the case for not separating the business layer and the application layer: I will call this merged business/application layer the “functional layer.” The serious scaling requirements posed by most applications these days call for partitioning, clustering, sharding or some other term for “dividing up the data so it does not become the bottleneck”. Enter the “architecture layer”. I hear you asking. “Isn’t that just the persistence layer?” Yes and no.

What’s New in 11i TXK AutoConfig and Templates Rollup Patch S

The 11i TXK AutoConfig and Templates Rollup Patch S (6372396) was released on May 5th. This patch differs from traditional TXK autoconfig template patch releases in that the ATG team decided to include some other important TXK patches also with this release. One of these is TXK Advanced Utilities Rollup Patch C (5011249). As a side effect of this generous inclusion of import updates, the patch size has increased from 16mb (RUP R) to 65mb (RUP S).

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?

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