The Blog

Nuances of Oracle Managed Files (OMF) and RMAN

Oracle Managed Files (OMF) have many advantages, but the fact that such files could coexist in the same database with manually added (and named) ones, could sometimes lead to confusion. Situation is made worse by the fact, that there is no straightforward way (at least of which I'm aware of...or rather was - please check the comment of Mikhail Velikikh) to say if the file is Oracle managed or not. Oracle documentation seems to confirm this:

Potential of "import catalog" command

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.

Latest updates to PerfSheet4, a tool for Oracle AWR data mining and visualization

Topic: This post is about the latest updates to PerfSheet4 v3.7 (February 2015). PerfSheet4 is a tool aimed at DBAs and Oracle performance analysts. It provides a simplified interface to extract and visualize AWR time series data using Excel pivot charts.

 

Datafile without backups - how to restore?

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...

Life of an Oracle I/O: tracing logical and physical I/O with systemtap

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.

 

A Summer at CERN: Evaluating OpenStack Trove as DBaaS Solution

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.

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