Saturday, November 29, 2014

Columnar Database

A column-oriented DBMS is a database management system (DBMS) that stores its content bycolumn rather than by row. It serializes all of the value of a column together, then the values of the next column, and so on. So, only the columns in the query need to be retrieved.

A columnar database has an advantage over row oriented dtabases in terms of efficiency of hard-disk access.

Aside from that, you can also get the following benefits when you use a columnar database:

1. Better analytic performance - the row-oriented approach allows better performance in running a large number of simultaneous queries.

2. Rapid joins and aggregations - the data access streaming along column-oriented data allows for incrementally computing the results of aggregate functions, which is critical for data warehouse applications.

3. Suitability for compression - it eliminates storage of multiple indexes, views, and aggregations, and facilitates vast improvements in compression.

4. Rapid data loading - in a columnar arrangement, the system effectively allows one to separate storage by column. This means that each column is built in one pass, and stored separately, allowing the database system to load columns in parallel using multiple threads.

Further, related performance characteristics of join processing built atop a column store is often sufficiently fast that the load-time joining required to create fact tables is unnecessary, shortening the latency from receipt of new data to availability for query processing.

Finally, since columns are store separately, entire table columns can be added and dropped without downing the system, and without the need to returning the system following the change.




However, there are also some drawbacks/challenges because no one-size-fits all system.

In terms of load time, converting the data source into columnar format can be unbearably slow where tens or hundreds of gigabytes of data are involved.

The incremental loads can be performance problematic.

For data compression, some columnar systems greatly compress the source data. However uncompressing the data to read it can slow performance.

There are also structural limitations. Columnar databases use different techniques to simulate a relational structure. Some require the same primary key on all tables, meaning the database hierarchy is limited to two levels. The limits imposed by a particular system may not seem to matter, but remember that your needs may change tomorrow. Constraints that seem acceptable now could prevent you from expanding the system in the future.

And lastly for scability. Columnar databases major advantage is to get good performance on large databases. But how about when you are dealing with common size database? Is it reasonable enough to use columnar database?

Tuesday, November 25, 2014

Top 5 Tech for 2015

There have never been such a wide choice out there for techies than there is today. With such a wide variety of tech being released this year it can be hard to make the right choice and get the best gadget that suits you. With so much up and coming tech even now in November promising the best of the best in terms of performance often delivering little, there’s a lot to consider when making your decision. That’s where we come to give you a hand. Here is our top 5 tech.

LG G FLEX

The LG G Flex came out in February this year. It is the first phone to offer a POLED curved screen, the curved screen offers a more panoramic and immersive experience with a 720 x 1280 resolution. Feature wise the G Flex has a 6 inch screen, 2 GB of RAM, 32GB internal memory, 4G, a 13mp camera and a whopping 3,500 curved mAh battery. The phone also comes with a self-healing back cover which protects it from scratches and is said to heal them in 5 minutes.

HTC One M8

The HTC One M8 is simply an all-round great Android smartphone. It comes with 2 GB of ram, a 2.3 GHz quad core processor and come in both 16 and 32 GB variants. It has a 5 inch screen and dual, yes dual 4MP cameras on the back and is upgradeable to Androids latest 5.0 Lollipop OS. The build quality on the M8 is impressive in its own right using high quality materials and Corning Gorilla Glass 3. If it’s a premium quality flashy phone you are looking for than the HTC One M8 is a great choice.

Microsoft Surface Pro 3

The Microsoft Surface platform devices have gone through an identity crisis these past few years since release. The surface pro 3 is the first to finally deliver on all of the promises that Microsoft has made time and time again. Its specs are on par if not better than many of the top of the line Ultrabooks that have come out this year. It can sit up on any surface including your lap all thanks to the new hinge and kickstand, also kitted with your standard USB port and finally a well-deserved overhaul to the resolution that doesn’t make holding it as a tablet uncomfortable and awkward. It’s a refreshing new look to the well needed surface series and it’s the closest thing Microsoft has made that is comparable to both the iPad and iMac, with the advantage of all its features stuffed into one product with a price tag to match.

iPhone 6

The iPhone 6 is Apple’s most impressive phone to date, both in terms of physical size and its hardware specification. The iPhone 6 is the largest and thinnest iPhone yet with a 4.7-inch awe inspiring retina HD display or a massive 5.5-inch retina HD display if you chose the iPhone 6 Plus model. It features the new 8-megapixel iSight camera and a new 64-bit A8 chip with an M8 motion co-processor built in house. The iPhone 6 also has a on board fingerprint scanner built into the home button like the Samsung Galaxy S5 and sporting Apples new iOS 8 operating system.

Dell Chromebook 11

A perfect matrimony of design, performance, battery life, graphics and overall build quality. The Dell Chromebook 11 has a 11.6 inch screen with a resolution of 1,366 x 768. It is powered by a Dual Core Intel Celeron 2955U pushing out 1.4 GHz with on board Intel HD graphics and comes with either 2 or 4 GB of ram. Other noteable features of the Dell Chromebook 11 are it has a 16 GB SSD, HDMI out, SD card port and 2 USB 3.0 ports. Boot time is less than 10 seconds and has an excellent battery life. It’s an excellent package and you can pick it up for under £200 which is a steal.

About the author:

Cass is a writer and blogger covering all aspects of technology and home improvements. Working with companies such as JNB Aerials to promote the best technology to the world.

Wednesday, November 19, 2014

3 Office Technology Solutions Every Workplace Needs To Run Smoothly

Running a modern business is nothing like it was twenty years ago. While computers may have been around back then, they were nowhere near as prevalent. It is vital that all company bosses move with the times and utilize all the latest tech to ensure their company makes the most profit possible. At the end of the day, your staff cost a lot of money to employ. So, if there are software solutions around that could save them time, they’ll become more productive. We’ve scoured the internet to find some of the best technology solutions you might like to consider. Most of them are used by thousands of businesses across the world.




If you only have a small budget, you’ll probably want to know how to get the best software without breaking the bank. Luckily, there are lots of articles online that can point you in the right direction. Just spend a few moments researching at some point in the near future. Thanks to monthly and yearly subscriptions, you no longer have to spend thousands to get the best solutions.

Apple computers

Whether you realize it or not, Apple computers are much better than their Microsoft counterparts. Not only do they run at faster speeds, but they’re almost immune to most of the viruses that can affect Windows systems. You can also get hold of lots of tools designed to improve performance even further. Mackeeper is one such tool. The cost of Mackeeper is lower than you might imagine, and so you should consider adding it to your machines as soon as they are delivered.

Video calling solutions

You need to deal with your customers and clients in the most-effective way possible. While you shouldn’t overlook the benefits of adding a live chat solution to your website, video calling with provide you with the best results. It will also help to increase consumer confidence in your brand. There is lots of different software you could use, but Skype is probably the best one out there. That is the case simply because the bulk of people who want to get in touch with you should have it installed on their machines.

Secure servers

You’ll want all the computers in your office to be interlinked. That means you’ll need to purchase a good quality server. You only have to look online to see a vast selection of good products on the market today. It is always a good idea to call in the professionals when it comes to setting up your server. The last thing you want is to find out hackers have managed to gain access and steal your most-important documents. Not only could that land you in trouble with the authorities, but it could also create the impression that you don’t know what you’re doing.

So long as you have those three essential technology solutions at hand, your chances of becoming successful will increase dramatically. While there are lots of other technology items you might require, those basic solutions are the best way to start.

Thanks for reading!