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System Architecture and Reliability

Which task is suited to batch processing?

  1. AProcessing a customer's cash withdrawal at a bank ATM
  2. BCollecting a day's worth of manufacturing equipment logs at night and aggregating them into a daily report on yield and other figures
  3. CReserving a train seat and securing it on the spot
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Answer: B. Collecting a day's worth of manufacturing equipment logs at night and aggregating them into a daily report on yield and other figures

Batch processing accumulates data for a certain period or amount and processes it all at once. It suits work that does not need to return results immediately but must process a large amount of data efficiently, such as aggregating a day's logs or calculating monthly payroll. Work that must be processed and answered immediately each time a request arrives, such as an ATM withdrawal or a seat reservation, is done by online real-time processing.

  • A. Each request must be processed immediately, so this is done by online real-time processing.
  • B. Correct. Accumulated data is processed together at night, which suits batch processing.
  • C. The seat must be secured and the result returned on the spot, so this is done by online real-time processing.
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  1. Among the measures used to evaluate the performance of an online processing system, which describes response time?
  2. In a system, each user request is processed in order by a web server tier, an application server tier and a database server tier. Each request passes through each of the three tiers once, and the maximum number of requests each tier can process is 1,200 per second for the web server tier, 1,000 per second for the application server tier and 900 per second for the database server tier. If the database server tier is upgraded to process 1,500 per second, which is the maximum number of requests the whole system can process?
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