Infrastructure high availability is extremely critical to Cloud Computing. In a Cloud system that hosts a large number of databases and applications with different SLAs, any unplanned outage can be devastating, and even a small planned downtime may be unacceptable.
Here’s a model of a problem I solved quite recently at a client site. The client’s query was much more complex and the volume of data much larger, but this tiny, two table, example is sufficient to demonstrate the key principle. (Originally I thought I’d have to use three tables to model the problem, which is why you may find my choice of table names a little odd). I ran this example on 188.8.131.52 – which was the client version:
Real Application Testing option has been enhanced to support “Consolidated Database Replay” functionality to help assess the impact of database and workload consolidation to a single database. Consolidated Database Replay allows concurrent replay of multiple captured production workloads from the same or different systems to a single database.
In my last blog post I reviewed the contents of the March/April 1996 edition of Oracle Magazine. While doing this I noticed on the Editors Pages, Julie Gibbs gave a review of the very first Oracle Magazine from 1987. Here is the front cover of the first Oracle Magazine. I’ve scanned the editors page, containing the review. Just click on the image below.