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May 2015

OpenTSDB and Google Cloud Bigtable

Data comes in different shapes. One of the these shapes is called a time series. Time series is basically a sequence of data points recorded over time. If, for example, you measure the height of the tide every hour for 24 hours, then you will end up with a time series of 24 data points. Each data point will consist of tide height in meters and the hour it was recorded at.

Re-Adding a Database to the AWR Warehouse Without Losing Historical Snapshots

There may be a reason that one needs to re-add a database to the AWR Warehouse.  This is a new opportunity for me to learn and offer assistance, but I’m working off the grid to figure out a solution.  Luckily, it’s just a matter of creating a new process from pre-existing code and processes.

OEM 12c Silent Installation

“What’s for lunch today?”, said the newly born ready to run Red Hat 6.4 server.

“Well, I have an outstanding 3-course meal of OEM12c installation.
For the appetizer, a light and crispy ASM 12c,
DB 12c with patching for the main and desert, and to cover everything up, OEM 12c setup and configuration”, replied  the DBA who was really happy to prepare such a great meal for his new friend.

“Ok, let’s start cooking, it won’t take long”, said the DBA and took all his cookware (software), prepared ingredients (disk devices) and got the grid infrastructure cooked:

Log Buffer #421: A Carnival of the Vanities for DBAs

As always, this fresh Log Buffer Edition shares some of the unusual yet innovative and information-rich blog posts from across the realms of Oracle, SQL Server and MySQL.

Oracle:

A developer reported problems when running a CREATE OR REPLACE TYPE statement in a development database. It was failing with an ORA-00604 followed by an ORA-00001. These messages could be seen again and again in the alert log.

Quick Tip : Oracle User Ulimit Doesn’t Reflect Value on /etc/security/limits.conf

So the other day I was trying to do a fresh installation of a new Oracle EM12cR4 in a local VM,  and as I was doing it with the DB 12c, I decided to use the Oracle preinstall RPM to ease my installation of the OMS repository database. Also I was doing both the repository and EM12c OMS install in the same VM, that is important to know.

[root@em12cr4 ~]# yum install oracle-rdbms-server-12cR1-preinstall -y

I was able to install the DB without any issues, but when I was trying to do the installation of EM12cR4, an error in the pre-requisites popped up:

WARNING: Limit of open file descriptors is found to be 1024.

For proper functioning of OMS, please set “ulimit -n” to be at least 4096.

And if I checked the soft limit for the user processes , it was set to 1024:

I love Live Demos – how about you?

Tired of boring slide-shows? Join me for free to see Oracle core technology live in action!

Live demonstrations have always been a key part of my classes, because I consider them one of the best ways to teach.

This is your opportunity to have a glimpse into my classroom and watch a demo just as I have delivered it there.

Apparently, not many speakers are keen to do things live, so the term Demonar (Demonstration + Seminar) waited for me to be invented :-)

A positive effect towards your attitude about LVC and Oracle University Streams with its live webinars is intended, since the setting and platform is very similar there.

Added a page about my LVC schedule

I get often asked by customers about my schedule, so they can book a class with me. This page now shows my scheduled Live Virtual Classes. I deliver most of my public classes in that format and you can attend from all over the world :-)

Fourth International NoCOUG SQL Challenge (teaser announcement)

The Fourth International NoCOUG SQL Challenge will be published in the May issue of the NoCOUG Journal which will be available at http://www.nocoug.org/Journal/NoCOUG_Journal_201505.pdf at 9 AM PDT on Monday, May 11 . Here's a sneak preview:
How Romeo Won the Heart of Juliet Fourth International NoCOUG SQL Challenge
Once upon a time, Romeo, the son of Montague, told his cousin Benvolio that he was in love with Rosaline but she was not returning his affections. Benvolio sang a song by the...(read more)