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Articles on Trending Technologies
Technical articles with clear explanations and examples
Difference between logical and physical standby database in the oracle
Logical standby and physical standby database in two different types of standby database. In case of any failure of primary database Oracle transfer data from primary database to the standby database. This approach helps us to recover data from standby database in case of any failure.Logical standby database is not the exact copy of the primary database. Logical standby uses LogMiner techniques to transform the archived redo logs into native DML statements (insert, update, delete). This DML is transported and applied to the standby database.Primary standby database is the exact copy of primary database so it helps to minimize the ...
Read MoreThe Story of WhatsApp
Whatsapp – “how did it all begin?” I remember when WhatsApp was in a corner on my Blackberry but without any notifications, I would use it for the people who did not have BBM. And now, BBM sits in a forgotten corner in my mobile. Here comes the story behind the scenesThe Story of WhatsAppJan Kuom had a dream of building the perfect app that doesn’t require asking for personal information and Jan, a simple guy who lived with his mother and grandmother in a small apartment, supported himself and entered into university and met his business partner, Brian Acton ...
Read MoreHow to Configure IT Automation Management Using Ansible
This article provides a basic understanding of Ansible technology along with steps to install it. Ansible is an open source IT automation software for configuring, managing and installing software’s on the clients or nodes without any downtime and agent installed on the nodes. It uses SSH to communicate with the clients.Currently, most of the IT Automation tools runs as an agent in remote host, but Ansible needs only an SSH connection, a user and a Python (2.4 or later).Environment Setup DetailsServer Operating System: Centos 6.7 IP Address: 192.168.87.140 Host-name: ansible.hanuman.com User: root Remote Nodes Node 1: 192.168.87.156 Node 2: 192.168.87.157Installing ...
Read MoreDifference between Inner and Outer join in SQL
In Relational database tables are associated with each other and we used foreign key to maintain relationships between tables. We used join clause to retrieve data from associated tables. The join condition indicates how column in each table are matched against each other. There are two types of joins clause in SQL Inner join Outer joinOuter join is again divided into parts −LEFT OUTER JOIN - It will return all data of the left table and matched records in both table RIGHT OUTER JOIN - it will return all the data of the right table and matched records in ...
Read MoreMobile Updates of the Week 37
Nokia C1Whenever the nostalgic folk of the early 2000’s fondly remember their first tryst with mobile phones, the name "Nokia" prominently features on their lips. People still view the-then immensely popular mobile phone company through a romantic lens and sing paeans over its seemingly-inexhaustible battery life and robustness. In fact, there’s still a joke around where a guy asks a Nokia-dealer- "If I were to drop this phone (Nokia 3310) on a granite floor, will it break? The dealer replies- "Of course. No floor’s hard enough.”If you are one of them, your heart might skip with joy on hearing that ...
Read MoreDifference between ETL and ELT in SQL Server
ETL stands for Extract, Transform and Load. ETL tool is used to extract data from the source RDBMS database and transform extracted data such as applying business logic and calculation, etc. and then load data into the target data warehouse. In ETL tool, transformation of the data performed at the ETL server. It is used for low amount data.ELT stands for Extract, Load and Transform. ELT tool is also used to extract data from source database and then load data into target database without transformation. In ELT, transformation of data is performed at the target database. In general, in an ...
Read MoreThe Power of Soft Skills!!
Soft Skills can be defined as “personal attributes that enable someone to interact effectively and harmoniously with other people”. This skill is indeed, one of those rare intangible abilities that can make a difference between success or failure. In this article, we will discuss the significance of soft skills and how it helps you to succeed.We are well aware that, one needs to sharpen technical skills to get employment. While professional and technical skills might get you a job and open the opportunities, Soft skills will provide the needed icing on the cake if you really wish to succeed in ...
Read MoreThe Number Game Behind: ISO 9000 Series
Often we read that a company is an ISO 9001:2000 certified. Some say they are ISO 9001:2008 certified. Even nowadays, we are watching the companies writing the statement, ISO 9001:2015 certified. After reading these tag lines, it is easy to assume that, ISO 9001 remains the same but the number after that keeps on changing. So, what does this changing numbers after the colons denote in ISO 9000 series?The answer to this question is, that these are the different versions of the standard and the year in which the version is released is mentioned after the standard number, i.e. ISO ...
Read MoreThe New Smartphone Battery that Recharges in Just 30 Seconds
Smartphones are like Oxygen of the modern day communication. It is hard to think about 21st century without smartphones. However, one thing that has not kept pace with the increasing usage of smartphones is the smartphone battery.We all know that recharging the smartphone battery is a clumsy and time-consuming process. For people on the go, recharging the smartphone battery is a headache. However, thanks to a new technology called Quantum Dot, an Israeli company called StoreDot, has made a new smartphone battery that recharges in 30 seconds flat.We will understand how the discharging and recharging happens in a normal battery ...
Read MoreThe fascinating world of Ferrofluids
What is this?You have just seen a slippery oily magnetic fluid called Ferrofluid. Though the working principles and material compositions are complicated, the basics are very simple. Tiny nanoscale ferromagnetic particles are suspended in oil or water. Each particle is coated with a surfactant to inhibit clumping. A surfactant is a substance that lowers the surface tension between liquids or between liquid and a solid. Ferrofluids usually do not retain magnetization in the absence a magnet or a magnetic field.Steve Papell of NASA developed the fluid in the 1960’s in response to the need for moving fuel in space where ...
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