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Jenny

Describe NoSQL and its purpose. Explain how it is used differently than MySQL. M12 jan30 az

Describe NoSQL and its purpose. NoSQL is a highly scalable and reliable non-relational databases designed to maintain high performance and to be highly cost efficient for workloads of any scale, from the smallest to the largest internet-scale applications. It is also used to build a new kind of database for "unstructured" information that comes spilling off the Internet with each passing second. It is capable of handling large amounts of data du to the fact that they use flash storage rather than traditional spinning disks. These solid-state drives can provide single-digit millisecond response times. Explain how it is used differently than MySQL. MySQL database is a relational database that stores data in neat rows and columns, and it's designed to run on a single machine, while NoSQL database can store data in a more flexible way and is designed to scale across a very large number of machines. "SQL databases are like automatic transmission and NoSQL databases are like manual transmission. Once you switch to NoSQL, you become responsible for a lot of work that the system takes care of automatically in a relational database system. Similar to what happens when you pick manual over automatic transmission. Secondly, NoSQL allows you to eke more performance out of the system by eliminating a lot of integrity checks done by relational databases from the database tier. Again, this is similar to how you can get more performance out of your car by driving a manual transmission versus an automatic transmission vehicle." http://stackoverflow.com/questions/2559411/sql-mysql-vs-nosql-couchdb

Da Woon November 1st  Describe the IT system

This article tells us the air traffic controller (ATC) which helps us to have safe fly. ATC has access to sophisticated radar systems that provide an overview of the airspace they control, and they have communication tools to coordinate flight paths with the air crew. When the aircraft travel at higher speed than common modes of transport, the time available for pilots to react to a dangerous situation can be quite short. And ATC helps to aircraft approaching an airfield carefully and it checks the weather conditions for prevent pilots can't see other aircraft. ATC uses radar systems positioned at ATC facility to get a real time overview of the aircraft flying in the airspace they control. Many types of radar equipment are served for traffic on the ground. Primary Surveillance Radars (PSR) - The radar sends a directed pulse into the atmosphere, and when that pulse encounters an object it gets reflected back to the radar station. The bearing of the object with respect to the radar station and its approximate distance can be calculated by this. The radar is typically enclosed in a dome to protect it from adverse weather. Secondary Surveillance Radars (SSR) - the Secondary Surveillance Radar listens for messages from the aircraft's transponder. The radar rotates about the vertical axis, but transmits a specific signal on 1030 MHz. This signal is subsequently received by the aircraft's onboard transponder, which responds with a reply on 1090 MHz. SSR Modes - There are different modes of interrogation that compliant transponders respond to. A - The transponder responds with its squawk code, a unique identifier for the aircraft assigned by ATC comprising of four octal numbers. This code enables ATC to differentiate between the various aircraft being monitored, though it can also be used to discretely communicate the existence of an emergency situation onboard the aircraft. C - the transponder responds with the aircraft's pressure altitude, which is the altitude ab