The Blog

XFS on RHEL6 for Oracle - solving issue with direct I/O

Recently we were refreshing our recovery system infrastructure, by moving automatic recoveries to new servers, with big bunch of disks directly connected to each of them. Everything went fine until we started to run recoveries - they were much slower than before, even though they were running on more powerful hardware. We started investigation and found some misconfigurations, but after correcting them, performance gain was still too small.

Openlab Intern 2015 Experience

Sneak peek into the life as a CERN Openlab Summer Student

It was a mix of bewilderment and awe when the first email came declaring that I was selected for the Openlab Summer Student Program. Little did I know that the journey would end in a mix of sadness (I never wanted to come back) and infinite memories (intricacies that even pictures cannot capture.)

How to create your own Oracle database merge patch

A little bit scary title, isn't it? Please keep in mind that definitely it is neither supported nor advised method to solve your problems and you should be really careful while doing it - hopefully not on production environment. But it may sometimes happen that you end up with the situation where creating your own merge patch for Oracle database could not be as crazy idea as it sounds :).

CHEP 2015 papers on replication and scale-out databases

CHEP 2015, the 21st international conference on computing in high energy physics, has taken place in April 2015 in Okinawa, Japan. Here below you can find the links to the pdf of the talks, posters and related preprints of two of the contributions by members the CERN database group. These are on the topics of our tests with scale-out databases (in particular on the Hadoop platform) and on the evolution of the replication technologies used for our Oracle databases (our use of Streams, GoldenGate and Active Data Guard):

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