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November 2014

EM12c, Rel. 4, OMS and OMR Health, Part II

Submitted by dbakevlar on Tue, 2014-11-11 22:37

There are a large number of “moving parts” when performance tuning or trouble shooting an Enterprise Manager environment.  The new EM performance features, (available in release 12.1.0.4) are there to assist you in understanding the source of the issue and can really make the difference for those that are unfamiliar with the challenges of Weblogic, java, network or other complexities that make up EM12c and

The Importance of the In-Memory DUPLICATE Clause for a RAC System

Submitted by Chris Antognini on Mon, 2014-11-10 22:36

With the INMEMORY clause you can specify 4 sub-clauses:

APEX Woman In Technology Award for 2014

Submitted by tim.evdbt@gmail.com on Mon, 2014-11-10 20:47

Based on the advise of a colleague, and also because of my desire to become more involved in the wider technology community in Colorado, I joined the Colorado Technology Association (CTA) last year.  I had been involved with the Rocky Mountain Oracle Users Group (RMOUG) for over 20 years, much of that time on the board of directors, including two 3-year stints as president, but I wanted to participate in the wider community beyond my beloved Oracle technology community.

I’ve only attended three CTA events to date, but this past summer I learned that CTA is a great advocate of Women In Technology (WIT) and has done a great deal of work to encourage women to enter the technology industry and to stay in the industry.

Concurrent statistics gathering in 12.1.0.2

Submitted by martin.bach on Mon, 2014-11-10 20:31

Prompted by an actual task at hand I spent some time investigating an 11.2.0.2 feature – concurrent statistics gathering. It has been on my to-do list for quite some time but so far I didn’t have a use case, and use cases make it so much easier. The question was-how can I gather statistics on a really large, partitioned table? Previously, you could revert to the degree in dbms_stats.gather_table_stats to ensure that statistics were gathered in parallel. This is all good, but sometimes you need more umph. Some DBAs wrote scripts to execute individual statistic gathering jobs against partitions in parallel, using the tabname and partname arguments in dbms_stats.gather_table_stats(). But that requires manual effort – and the not-quite-so-new concurrent option is so much nicer. Let me take you along the ride… Actually I have to tell the story starting with the happy ending as I had a few snags along the way. This is 12.1.0.2.1 on Oracle Linux 6.5.

Presentations to go to at #DOAG2014

Submitted by Uwe Hesse on Mon, 2014-11-10 17:26

As every year, there’s a long list of great speakers with interesting talks to attend at the DOAG (German Oracle User Group) annual conference. Sadly I cannot attend them all, so I’ve got to make a choice:

First day

Datenbank-Upgrade nach Oracle 12.1.0.2 – Aufwand, Vorgehen, Kunden by Mike Dietrich, Oracle

Die unheimliche Begegnung der dritten Art: XML DB für den DBA by Carsten Czarski, Oracle

Advanced RAC Programming Features by Martin Bach, Enkitec

Automatische Daten Optimierung, Heatmap und Compression 12c live by Ulrike Schwinn, Oracle

Second day

Understanding Oracle RAC Internals – The Cache Fusion Edition by Markus Michalewicz, Oracle

Cache Buffer Chains Demystified

Submitted by arupnanda on Mon, 2014-11-10 15:19

You must have seen sessions waiting on the event “latch: cache buffers chains” from time to time. If you ever wondered what this means and how you can reduce time spent on it, read on.

Is Continuous Integration compatible with database applications ?

Submitted by khailey on Mon, 2014-11-10 13:00

Continuous integration and continuous delivery offers huge efficiency gains for companies  but is continuous integration even possible when the application’s backbone is a massive relational database. How can one spin up database copies for developers, QA, integration testing,  and delivery testing ?  Its not like Chef or Puppet can spin up a 10TB database copy in a few minutes the way one can spin up a Linux VM.

There is a way and that way is called data virtualization which allows one to spin up that 10TB database in minutes as well as branch a copy of that 10TB from Dev to QA, or for that matter branch several copies and all for a very little storage.

Next Club Oracle London – 12th November 2014

Submitted by mwidlake on Mon, 2014-11-10 09:52

The next Club Oracle London is taking this place, on Wednesday 12th November. You can find the details here.

This is a free evening or Oracle talks provided by some of our local experts and beer/snacks provided by e-DBA. The first event was back on the 3rd of July and it was a great evening. The coming event will have presentations by James Anthony, Dominic Giles and Jason Arneil in 12C in-memory database, key facts gleaned from OOW14 and 12C enhancements respectively – all excellent presenters and you get to ask them awkward questions in an open session at the end. Plus free beer and (I think) pizza to keep you going. All you can ask for of a user group meeting.

Quiz night

Submitted by Jonathan Lewis on Fri, 2014-11-07 18:37

Prompted by an email from Yves Colin (who’ll be presenting on the Tuesday of UKOUG Tech14) I was prompted to dig out a little script I wrote some years ago and re-run an old test, leading to this simple question:  what’s the largest size array insert that Oracle will handle ?

If you’re tempted to answer, watch out – it’s not exactly a trick question, but there is a bit of a catch.

Friday Philosophy – Is Dave Productive?

Submitted by mwidlake on Fri, 2014-11-07 10:42

How do I know if Dave is doing his job properly? If I am his (or her*) manager, what techniques can I use to ensure I am getting my pound of flesh out of this worker drone in return for the exorbitant salary my company puts into said drone’s bank account each month?

Well, as a start there is my last Friday Philosophy all about deduction of work profile via auditory analysis of input devices (ie how fast is Dave typing) :-) I have to say, the response to that topic has been very good, I’ve had a few chats with people about it and got some interesting comments on the blog article itself. My blog hits went Ping :-)