Real-life scenario describing troubleshooting of instance startup problems and actions needed to solve them.
Databases at CERN blog
Since version 11.1 of Oracle database, there is very useful command available, allowing DBAs to easily move RMAN recovery catalog schemas between databases. Its functionality is even broader, as it also allows one catalog schema to be merged into another - either the whole schema or just the metadata of chosen databases. Command I'm writing about is of course import catalog, which I had a chance to use recently, to move our recovery catalog to the new database.
Grammatically the title has no much sense, but those were the keywords that I used to type a couple of years ago when I started to work in the integration of our JEE applications into our SSO system.
Have you ever had a problem with restoring datafiles without any backups available? It's easy, of course if you have all archived logs from the time datafile was created. Please check it here: Re-Creating Data Files When Backups Are Unavailable. Moreover, RMAN is clever enough to create empty datafile automatically during restore phase and then recover it using archived logs. So far, so good, but...
This is a short blog post with a list of the talks at the UKOUG TECH 2014 conference in Liverpool with CERN speakers. Come and say hi, we hope to see many of you there!
Topic: This post is about tracing logical and physical reads in Oracle using SystemTap. You find here a few examples illustrating the main mechanisms used by Oracle to performo physical and logical I/O and you learn how to build SystemTap scripts to further explore and troubleshoot Oracle I/O.
I have been one of the 23 students participating in the CERN openlab summer student programme this year. Like two of my fellow students in the database group, Sneha and Anti already did, I want to share some insights into the project I worked on and in general about my experience with the summer programme. Thus, the post is divided into a general part and a technical part, which will sum up what I did with OpenStack and its component Trove.
Most of you for sure know, that ability to restore data in case of failure is a primary skill for each DBA. You should always be able to restore and recover data you’re responsible for. This is an axiom. To be sure, that you’re able to do it, you should test it on regular basis. There is of course possibility to use some Oracle features, like backup ... validate or restore ...