Posts Categorized: Technical Blog

Exadata X3H2M2: A Few Thoughts

Tonight at Oracle OpenWorld, Oracle CEO Larry Ellison announced the latest Exadata release: X3. It sports a hardware refresh including a big expansion in RAM and flash storage capacity: 4TB and 22TB respectively on a full rack. Read my thoughts on this here.

MySQL Oracle Connect 2012: Day One

I attend five sessions today and I think some of them were very interesting. Like the one on the Optimizer insight, quite informative and accurate.
The other one done by the MySQL Cluster (NDB) group on the installer and new Javascript API interface, left me a little bit … foggy. Why? Because in my mind one of the most important thing to accomplish in NDB is the correct dimensioning of the memory, buffers, possible operation, attributes and so on, all things that should come from the review of the schema definition review and from the application analysis.

MySQL Oracle Connect 2012 Keynotes

It is exciting to be here, meeting again old friends and ex colleagues, but also exciting for what seems the start of a very significant conference fro MySQL. I really enjoy the introductions done from Edward Screven and Thomas Ulin. Edward highlight the fact that MySQL is increasing his presence in the market and in the community. This could be also thanks to the unbelievable effort done by Oracle in keeping his production cycle on target.

RAC Attack at Oracle OpenWorld

Along comes the Oracle RAC Special Interest Group (SIG) which is appearing at a conference near you. At Oracle Open World 2012, RAC SIG personnel will be on-hand running RAC Attack – a hands-on lab where you can build a cluster on your Windows, MAC, or Linux personal computer. This is a dream come true. I first did RAC Attack at the UKOUG show in Birmingham last December. I am not anywhere close to being a RAC expert but I have rolled my sleeves up and got into the technology. Do not miss this opportunity at Oracle Open World next week in San Francisco

Troubleshooting ORA-27090 Async I/O Errors with Systemtap

There’s a known bug, 7306820 “ORA-7445 [krhahw] / ORA-27090 during file header read. Instances may crash, but this bug is fixed in 11.2.0.1, and this database is running 11.2.0.3. And on top of that, it’s an Exadata system, so I/O to storage servers goes over the InfiniBand network rather than using async I/O (AIO) calls.

SQL Server: High Availability and Disaster Recovery à la Carte!

n the business world, a good RDMS is one that can provide high availability (HA) options with minimal downtime and the cheapest licenses. Vendors usually if not always provide a set of HA features to satisfy different needs. Usually, some of these features are reserved for higher-end editions. The most important factors to consider when choosing an edition are…

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