Category Archives: SmartScan

Oracle OpenWorld 2015

Submitted my Oracle OpenWorld 2015 presentation earlier.  Today is the last day to submit proposals for presentations or tutorials.

Oracle have extended their deadline for proposals until May 6th!



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DBA 3.0 – How to Become a Real-World Exadata DBA – IOUG Collaborate 2015

According to a Book of Lists survey, 41% of people’s biggest fear is “public speaking”.  To put that into perspective, “death” is the biggest fear for 19%, “flying” for 18% and “clowns” don’t even register (which does make me seriously doubt the survey’s credibility).

I gave my first public presentation at IOUG Collaborate 2015 last week in Las Vegas and I didn’t die.

Why did do make your presentation debut at the second largest Oracle event on the calendar?  Excellent question.

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How Do *YOU* Measure SmartScans?

With SmartScans being the most important (and most unique) performance feature for Exadata, it’s incredibly useful to measure how well you’re making use of it.

But how?

There are a number of ways you can measure this, but none of these seem to be the DEFINITIVE method to do so.  Instead, it’s probably a good idea to more than one formula, if not all, to get a good idea of our SmartScan usage.

Why are there multiple formulas?  Because the existing database metrics don’t quite capture what we’re looking to measure.  For instance:

  • physical read total bytes‘ –  is all the data including compressed data AND SmartScan-ineligible data.
  • cell physical IO interconnect bytes‘  –  includes the writes (multiplied due to ASM mirroring) AND the reads.
  • cell IO uncompressed bytes‘  –  is the data volume for predicate offloading AFTER the Storage Index filtering and any decompression
  • cell physical IO interconnect bytes returned by smart scan‘  –  includes uncompressed data.

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