On April 2nd Cloudera is hosting a webinar featuring Ralph Kimball who will "describe how Apache Hadoop complements and integrates effectively with the existing enterprise data warehouse. The Hadoop environment's revolutionary architectural advantages open the door to more data and more kinds of data than are possible to analyze with conventional RDBMSs, and additionally offer a whole series of new forms of integrated analysis.
Great post from Oracle on How to Deploy a Four-Node Oracle RAC 12c Cluster in Minutes.
Just a few notes to for me to remember and share.
From the section:
4. From the Oracle VM Manager GUI, import the template files by providing both URLs for the same import session. The import process will take several minutes; be patient.
I used the URL below:
I noticed this recently on an Oracle 18.104.22.168.0 database.
CORRECTION : Although I posted this as DEFERRED_SEGMENT_CREATION=TRUE behaviour, Marko has pointed out that it applies even when D_S_C is set to FALSE. So I am posting two test cases, one with D_S_C set to TRUE, and one with it set to FALSE.
This is the first case with DEFERRED_SEGMENT_CREATION=TRUE
In LinkedIn, a new connection asked me a very nice question. He asked, “I know this might sound stupid, but how did you learn so much stuff about Oracle. :)”
Good one. I like the presumption that I know a lot of stuff about Oracle. I suppose that I do, at least about some some aspects of it, although I often feel like I don’t know enough. It occurred to me that answering publicly might also be helpful to anyone trying to figure out how to prepare for a career. Here’s my answer.
I blogged about Dynamic Resource Mastering (DRM) in RAC here . DRM freezes the global resources during the reconfiguration event and no new resources can be allocated during the reconfiguration. This freeze has a dramatic effect of inducing huge amount of waits for gc buffer busy [acquire|release] events and other gcs drm freeze release, gcs remaster events. In database version 12c, DRM has been improved further.
The idea for this post came from a problem, which I saw on Javier Morales Carreras' blog here.