7 Ways Data Virtualization Helps CIOs

IDC study found that Delphix

  1. Pays for itself in 4.3 months
  2. ROI 461% over 5 years
  3. $1 Million storage and hardware savings
  4. $50 Millionannual  savings for companies over 75,000 employees
  5. $78,500 saved per year per 85 employees
  6. $85,000 annua lIT efficiency per 100 employees
  7. 98.6% storage reduction on a 2.42 TB database footprint


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Oracle performance video library

Here is a series of Oracle performance tuning videos that I put together recently at Delphix. All the presentations are free and open to the public, just have to register.



Successfully managing a modern organization’s complex data estate requires careful work at multiple layers, from the implementation of organization-wide data policies and platforms to the careful tuning of particular databases. Only with optimization at every level can data achieve its full potential, enabling the (more...)

Greening of Storage

By Tim Gorman

I recall that the Dec 1999 or Jan 2000 issues of Nat’l Geographic magazine had a “Letters From The Editor” column that speculated, in jest, that the rate at which humans were saving back-issues of Nat’l Geographic magazine, would by the year 2100 result in the total accumulation of yellow magazines outweighing planet Earth.

Anyway, that statement resonated with me, because although I change residences every few years, it has only been (more...)

ASH presentations from John Beresniewicz


John Beresniewicz and I worked hand in hand on developing the performance pages in Oracle Enterprise Manager. John is one of the foremost experts on active session history (ASH) queries and he has recently posted some of his presentations on ASH to slideshare:




Can you justify your data ?

People ask me to justify use of Delphix. I can understand. Delphix is pretty new and often, most of my friends who are DBAs respond with “I can copy a database, so what, I can do it a little faster with Delphix.” Well that’s missing the whole boat. The question won’t be why you should use Delphix but “can you  justify working without Delphix?”

I see Delphix as amazingly positioned at nexus of data (more...)

What is Dephix ? (video presentation)

According to a recent IDC study, on average Delphix

  • pays for itself in 4.3 months
  • 461% ROI over 5 years
  • 96.8% reduction in database storage
  • $50 Million predicted annual benefit for organizations over 75,000 employees

Delphix is used by over 100 of the Fortune 500.

What is Delphix? Why is Delphix important? What problems does Delphix solve in the industry?

Here is a slide deck I put together for KSCOPE :

And here (more...)

ASH visualized in R, ggplot2, Gephi, Jit, HighCharts, Excel ,SVG

There is more and more happening in the world of visualization and visualizing Oracle performance specifically with v$active_session_history.

Of these visualizations,  the one pushing the envelope the most is Marcin Przepiorowski. Marcin is responsible for writing S-ASH , ie Simulated ASH versions 2.1,2.2 and 2.3. See

Here are some examples of what I have seen happening out there in the web with these visualizations grouped by (more...)

To subset or not to subset

There was a problem at a customer in application development where using full copies for developers and QA was causing excessive storage usage and they wanted to reduce costs , so they decided to use subsets of the production development and QA
  • Data growing, storage costs too high, decided to roll out subsetting
  • App teams and IT Ops teams had to coordinate and manage the complexity of the  shift to subsets in dev/test
  • Scripts had (more...)

Finding the blocking SQL in a lock wait

One of my pet peeves on Oracle is the inability to find out what SQL took out a lock that another user is waiting. It’s easy to find the waiting user and their SQL with v$session by looking at v$session.event where the event is an “enqueue” (v8 and v9) or “enq: TX – row lock contention” and then looking up their SQL via the v$session.sql_hash_value which joins to v$sql.hash_value for the v$sql. (more...)

Excel connect to Oracle – 64bit and 32bit issues

Wow, thanks to

Process Monitor   http://technet.microsoft.com/en-us/sysinternals/bb896645

I was able track down why I couldn’t connect to Oracle from Excel.

I had wanted to try some of the examples Charles Hooper has posted on connecting to and monitoring Oracle, for example


I kept getting the error “Provider not found”
Now what kind of trace info is there for an error like this in Excel? None AFAIK. Time to start guessing.