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October 2013

UKOUG Tech13

Event date: 
Sun, 2013-12-01 - Wed, 2013-12-04

 A large number of OakTable members will be speaking at UKOUG's Tech13 event in December. We hope to see you there!

First N

I’ve just added a little update to my posting on the 12c “First N” clause, pointing out that there are variations in the WINDOW SORT operation that can make a difference to performance.

This note won’t accept comments, and I’ll be deleting it in a few days.

 

Exadata: disk level statistics

This is the fourth post on a serie of postings on how to get measurements out of the cell server, which is the storage layer of the Oracle Exadata database machine. Up until now, I have looked at the measurement of the kind of IOs Exadata receives, the latencies of the IOs as as done by the cell server, and the mechanism Exadata uses to overcome overloaded CPUs on the cell layer.

The High Price of Data

Piggy Bank

You’ve purchased servers, storage space, switches, cables, and countless other pieces of hardware. The Oracle licenses are bought and paid for, Enterprise Edition with a few add-ons. All told, you’ve spent a small fortune on this infrastructure. It’s finally time to start up your database and begin using it for projects…

…Data gathers, and now your cost begins.

A Game of Clones

DBAs and other IT professionals (and sometimes naive executives) can fall into the trap of thinking that the up front costs of application building are all you have to consider for an application. To be honest, a lot of IT professionals don’t even think that far–we need components, we buy them. But the costs pile up far beyond the initial purchase.

APAC OTN Tour 2013

Just a quick plug for an upcoming OTN tour, that I’m not on this year.

  • Auckland, New Zealand : 8th November (agenda)
  • Perth, Australia : 12th-13th November (agenda)
  • Tokyo, Japan : 13th-15th November
  • Beijing, China : 17th-18th November
  • Guangzou, China : 19th November

I attended the OTN Asia Pacific Tour in 2011, which included some of these locations. Hopefully I will get to do it again in the near future. :)

Like any conferences, these events are all about the attendees, so the more people that turn up and the more vocal the attendees, the better the events are.

When Your Hard Disk is Too Slow

When Your Hard Disk is Too Slow  Those of you who know me well know that I like my hardware fast.  You may also know that I run multiple virtual machines (VM’s) at once to demonstrate different Enterprise Manager functionality.  To do that on a laptop raises some challenges, so I use what my boss […]

ACA: Good name, Possibly a good notion, Horrible implementation

The fundamental underpinning of the math and costs under mandated universal care NOT paid for by the government is people who have continuously paid for insurance are now pooled with folks who previously rolled the dice on the costs of chronic ailments. There is no reward for having paid to not take the risk over a long period and we are now burdened directly with the cost of the losers. Now, historically the culture in this country is that buying insurance is an individual risk choice. Don’t buy fire insurance? If your house does not burn down, big win. Most people choose to not take that risk and if you have a mortgage the bank makes the safe choice for you because their experience is based on a pretty good proxy for the entire risk pool. It would be entirely possible to craft a system that rewarded people for their past contributions to the shared risk, but that was not done.

Captain Support and the Mystery of the Broken Website (Internet Explorer 11)

After successfully upgrading two laptops to Windows 8.1, Captain Support flew back to his secret server room and continued to monitor the world’s communications, waiting for the next opportunity to allow mere mortals to witness his greatness. That opportunity came when his sister-in-law emailed to say that his nephew’s football academy website was not working properly…

Having read some reports about broken websites, Captain Support assumed the problem was because of Internet Explorer 11, so he used LogMeIn to connect to his sister-in-law’s laptop, installed FireFox and tested the website. It worked perfectly. The site also worked fine using Chrome.

OS X Mavericks on MacBook Pro (13-inch, Mid 2009)

After getting back from the OTN Nordic Tour 2013, I figured it was time to give OS X Mavericks a go.

I’m currently using a MacBook Pro (13-inch, Mid 2009). It’s a little long in the tooth, but it has 8G RAM and a 256G SSD, so it still performs pretty well. At least well enough for me not to replace it just yet. :)

The download took about 30 minutes. I guess I’m a little behind the curve here because lots of people complained about the download times. It pays to hold off for a few days. The installation took about the same amount of time too, so after about an hour I had Mavericks up and running.

Several people reported really slow performance after the upgrade. So far it looks pretty much the same to me.

The Rise of Endymion

The Rise of Endymion is the fourth book in the Hyperion Cantos series by Dan Simmons.