Using HISTORY in SQL*PLUS 12.2….

One of the biggest things that we couldn’t do in the previous versions of the oracle database was to use the back arrow button-to reexecute the old commands, without typing them. Of course, a workarouns is possible in the form of rlwrap but it’s not comparable to a natively available feature in the SQL*PLUS. Well, until now because now, we have HISTORY option available in 12.2 SQL*PLUS. Let’s take a look.

SQL> /

BANNER                         (more...)

Oracle Documentation permalink creation

Tim Hall of ORACLE-BASE spoke for a lot of people when he (yet again) wrote about Oracle Documentation links changing all the time. There exists a method for a more permanent link to Oracle Documentation, but it can be a hazzle to create such a permalink involving manually searching HTML code of the doc source (see my comment to Tim's blog post.)


Then I thought that this manual creation of permalink probably could be (more...)

VirtualBox 5.0.16 Released….

As always, Tim Hall was the first to find it out :=) . So if you haven’t done already-update your VirtualBox setup to VirtualBox 5.0.16 version. I have done the update on my laptop (this one, Win 7 Professional) and desktop(Win 7 Professional) with no issues.

Have upgrading!

The Fundamental theorem of arithmetic – SQL version

Every positive integer (except the number 1) can be represented in exactly one way apart from rearrangement as a product of one or more primes, see for example Wolfram MathWorld or Wikipedia.

Here is the SQL-Version, we compute this for all integers up to 100

with bound as
(
select 100 as bound from dual
),
n_until_bound as (
select level+1 n
from dual
connect by level <= (select bound.bound from bound)
),
primes_under_bound  (more...)

A Greedy Algorithm using Recursive subquery factoring

Today is friday and I like the twitter-hashtag #FibonacciFriday,
so I tweeted

 

Don’t be afraid of having a look at the wikipedia-site, the math is not complicated at all ( you don’t need more than adding natural numbers smaller than hundred ), nevertheless the theorem is nice from a (more...)

Real Push Button Refresh with Raspberry Pi

Push Button

In this post, we’re going to perform a push button refresh of an Oracle Database, Application Express (APEX) installation, and Tomcat webserver.

“But Oracle Alchemist,” you’re probably thinking, “we know about that. You’ve told us about how Delphix can provision and refresh data.” And yes, you’d be right. But I wasn’t done yet.

We’re going to perform a refresh of an Oracle Database, APEX installation, and Tomcat running in Amazon Web Services, replicated from (more...)

Fun : 2015 !

Excellente Année 2015 !

Managing your Database in a Zombie Apocalypse

Zombie Server Room

Only two things are really certain: network latency over long distances, and the fact that humanity will soon rapidly degenerate into undead brain-eaters.

When that day comes, when the dead are crowding at your door and the windows are busted out and ripped up rotted arms are clawing at the inside of your home, I know what you’ll be thinking: is my database protected?

Don’t worry, my friends. The Oracle Alchemist has you covered. We (more...)

Another Great OpenWorld

Steve at the Delphix Booth

Last week I attended Oracle OpenWorld 2014, and it was an outstanding event filled with great people, awesome sessions, and a few outstanding notable experiences.

Personally I thought the messaging behind the conference itself wasn’t as amazing and upbeat as OpenWorld 2013, but that’s almost to be expected. Last year there was a ton of buzz around the introduction of Oracle 12c, Big Data was a buzzword that people were totally excited (more...)

Teach Your Children Well

computerroom

Today’s the first day of school in my city, and the plethora of “OMG 1st day of school!” posts of Facebook and my own kids heading back in to slog through another year of fundamentals got me thinking about education. My own kids (12/daughter and 10/son) came home and went swimming since it was about 104 degrees today…the hottest day of the summer, as it were.

minecraft-2__140227213724Anyways, after that activity my son decided to (more...)