Let's Spell - Alexa Skill

Let's spell the words with Alexa! Wouldn't it be fun if we can take turns with Alexa to spell the words? 

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Written by rajkiran on Thursday July 12, 2018

Image: 2018-07/lets-spell-inline-600.png

Element Info - Teach me or Quiz me! - Alexa Skill

Here is my alexa skill published in amazon skill store that will help you to learn basic information about the Periodic table elements in a very interactive and engaging way with the help of Alexa. 

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Written by rajkiran on Thursday August 17, 2017

Image: 2018-04/element-info-hekash-sm.png

Configuring port access using Linux Firewall

Many of the Linux distributions come with a very powerful system firewall using IPTables. IPTables program can be used to setup rules for enabling/disabling access to various ports on the server.

Here is an example where I cannot access the "DBExpress" application running on machine kirlinc.home with port 8888 from any of my other servers in the network.

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Written by rajkiran on Monday June 9, 2014

Image: 2018-06/re-ripple-1-medium-large.1508200256.jpg

Oracle 12c - Multi threaded Model

For the databases running on UNIX and Linux operating sysems, 12c release introduces new multi threaded model for the execution of oracle processes.
By default multiprocess execution model is enabled for the 12c database. In order to switch to the multithreaded model, the following parameter needs to be set

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Written by rajkiran on Sunday June 8, 2014

Image: 2018-06/water-ripple-3.jpg

Oracle 12c - Multi Tenancy Architecture



The most exciting feature in 12c is the multi tenancy architecture which will greatly benefit in the database consolidation with reduction in the overhead of resources needed for maintaining multiple instances and easing up lot of DBA administration activities
For backward compatibility, 12c still supports the traditional architecture. You have to explicitly choose the new architecture option when creating new database.

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Written by rajkiran on Sunday June 8, 2014

Image: 2018-06/ripple-2.jpg

OpenProject installation on Ubuntu with Postgresql and Apache / Nginx

In this note, let's do a quick review on the installation of the very popular open source OpenProject software with Postgresql database and Apache/Nginx webservers. Open Project software has plenty of features, needed for managing the entire project life cycle and is offered with the Community Edition and Enterprise licenses.

The openproject installer for ubuntu configures mysql database and apache webserver by default. We will need to do little bit customization in order to use postgresql as the database for the repository and also check the basic configuration needed to get access to the web UI with either apache or the nginx webserver.

Configuration Info

Operating System : Ubuntu 16.04 ( Xenial )
Database : Postgresql 9.15.2
Web Server : Apache / Nginx
Open Project :  Community Edition

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Written by rajkiran on Saturday June 23, 2018

Image: 2018-06/niagara-600.jpg