Free Exadata Tutorials and Demonstrations

Let Oracle Certified Master DBA John Watson teach you what Exadata is and demonstrate how it works!

Oracle Exadata Database Machine

A Database Machine is a massively scalable and fault tolerant piece of hardware (CPUs, RAM, discs, and networking: all perfectly balanced) combined with the Exadata smart storage software. A really powerful database server, with a disc subsystem that understands the database and take over a huge proportion of the data processing workload. This is the “offload processing” feature: no other platform can do this.

Experience shows that porting a database to a DB Machine is easy – but actually getting the benefits is harder. Before making the investment (a huge investment) in a DB Machine you will do a POC that shows that the applications work. That doesn’t mean they work as well as they could. Offload processing is more elusive than one might think, and to achieve it you may need to reconfigure your data structures and adjust your code. This is a non-trivial task that goes far beyond the usual SQL and segment tuning activities: it is a whole new layer of optimization.

We believe that the real ROI will come only from extensive work after the migration, as the application and the database are tuned to the capabilities of the Exadata platform. Yes, you will get an immediate performance boost – but you should be getting much more.

Let us help you optimize your applications for Exadata!

Contact us at 1-401-783-6172 or email us to see how we can help you.

Oracle Exadata Database Machine Tutorials
(Login Required for sessions 2 and above)

  1. About the Exadata Hardware
  2. What Makes the DB Machine Special
  3. Smart Scan in Theory
  4. How Smart Scan Functions – Demo
  5. Smart Scan in Practice
  6. Making Smart Scan Work – Demo
  7. HCC in Theory
  8. HCC performance and Compression Ratio – Demo
  9. HCC Limitations and Best Practices
  10. HCC Compression Degradation Issue – Demo
  11. Exadata is Good But Not Easy

Let us help you optimize your applications for Exadata! Contact us at 1-401-783-6172 or email us.


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HCC Compression Degradation Issue – Demo

We’ve seen the really nice degree of compression we’ve achieved against my hybrid compressed table. Now we’ll just do some DML against it.

Now I’ll go to my basic compressed table or the deduplicated table. It’s a pretty bad timing difference there. Now let’s move on to the HCC table, and you can see there’s definitely a performance hint when compared to the non-compressed data.

Now, whether that’s likely to be a problem, I simply don’t know, but it would depend on the nature of your application. Clearly, this is a pretty big hint, so you need to think quite hard about which tables to apply HCC to. It may not be a problem for many sites.

One more check we need to do is to see the effects on space usage. So I’ll just gather some fresh statistics for all three tables. Now, previously, we were achieving about two for one on basic compression and it’s 30 for one on hybrid columnar compression.

Now we see the really bad news. My basic compressed table has about doubled in size. My uncompressed table has remained pretty much — in fact, identical to what it was before, and my HCC table has now become the size of the uncompressed table plus the seven blocks there was originally, and this is serious. The degradation and compression of DML is something that many sites will definitely need to think about.

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