A school decides to harmonize the operation of its two campuses using a distributed database system as well as install air conditioners and uninterrupted po...

This scenario tests the merits and demerits of distributed databases and the reasons for laboratory air-conditioning and a UPS.

(a)(i) Three importances of a distributed database.

• Data can be stored close to where it is used, giving faster local access at each campus.
• It is more reliable: if one site fails, the other site can still operate, so there is no single point of total failure.
• It allows data sharing between the campuses while still permitting local control, and it grows easily as more sites are added.

(a)(ii) Three disadvantages of using computer processing of information.

• High cost of buying, maintaining and securing the equipment and software.
• Risk of data loss or breach through system failure, hacking or viruses.
• It can lead to job losses/over-dependence, and needs trained staff and constant power.

(b)(i) Two reasons for installing air conditioners. To keep the equipment cool and prevent overheating that damages components, and to control humidity and dust, providing a comfortable environment for users and stable operation.

(b)(ii) Two reasons for installing a UPS (uninterruptible power supply). To provide backup power so the computers keep running during a power cut, and to protect equipment and unsaved data from sudden power failure and voltage fluctuations by allowing a safe, orderly shutdown.

Examination reminder: tie each reason to a consequence - air conditioning prevents overheating; a UPS prevents data loss and damage from power cuts. State the benefit, not just the device.