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Why Upgrade to Oracle 12c

Oracle 12c: Making the Impossible, Possible?

Pythian’s Oracle team has had the opportunity over this last year to explore, test, and assess every aspect of Oracle’s latest database release. Oracle 12c, and we have to say, it’s very impressive. See our top 5 reasons to upgrade and share your reasons.

How Filtered Indexes Look Like (Part 1)

“During one of my SQL Server Index Internals presentation, an attendee asked me how filtered indexes look like and if they are stored exactly the way the traditional indexes are. I was tempted to show the internals of how filtered indexes looked like using DBCC PAGE during the presentation, but held back because it deserves…

Do You Know If Your Database Is Slow?

The time to respond There was a question at Pythian a while ago on how to monitor Oracle database instance performance and alert if there is significant degradation. That got me thinking, while there are different approaches that different DBAs would take to interactively measure current instance performance, here we would need something simple. It…

Update on Home Learning Lab – Hyper-V

This is an update on my “Setting up a home learning lab” post. I have recently decided to upgrade the host OS on my desktop to Windows 8 Professional so I could check out Hyper-V as a virtualization platform and get to know Windows 8 better. Windows Server 2012 would have been my first choice,…

Log Buffer #325, A Carnival of the Vanities for DBAs

Close your eyes and imagine an affordable holiday featuring islands, pools, simmering white sandy beaches, and clubs. Chances are that you’re thinking about a resort in Hawaii, Fiji or French Polynesia. Now picture such a trip right now. I’ll give you a second. Still wondering? Yep, it’s this edition of Log buffer. :)

Managing Oracle on Windows: Where’s my Oratab?

If you manage Oracle on Windows, you probably have wondered why it is so difficult to work out which Oracle instances are running and which ORACLE_HOMEs they use. On Unix or Linux, this is a very simple task.  Oracle services and their ORACLE_HOMEs are listed in the oratab file, located in /etc/ on most platforms…

Exadata Join Offloading in Action

One of the biggest selling features of Oracle’s flagship engineered system – Exadata – is the storage offloading capabilities. Storage offloading allows data to be filtered as soon as it is read from storage, reducing the amount of data that database hosts need to process. The storage layer is a shared-nothing MPP architecture and in…

Oracle Database Load Testing Tools – Overview

At Pythian’s internal forum, someone just asked the following question: “The team here is evaluating DB load testing tools (Hammerdb, Orion, SLOB, and Swingbench) and was wondering about our experience in using different tools and what is our opinion?” I have experience using some of the tools mentioned. Therefore, decided to answer using this public…

Hard Drive: Inner or Outer?

To be precise, I wonder if OUTERmost tracks of a spinning HDD are faster than INNERmost tracks. Should we put physical IO performance secretive data to OUTERmost parts of  the disk and less critical data to INNERmost parts as several vendors suggests? Well I couldn’t find a better solution than grabbing all HDDs I have and start testing :)

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