Lecture #2.1 - Streaming Data Introduction

What are the two dimensions used to classify real-time systems?

• Speed and Size

• Latency and Tolerance for delay

• Accuracy and Precision

• Efficiency and Effectiveness

What is the main difference between real-time and streaming data systems?

• Real-time systems have better network connectivity

• Real Time data systems make data available when needed

• Streaming data systems have lower latency

• Real-time systems process data faster

What is the main purpose of decoupling in distributed systems like big data platforms?

• To synchronize data 24x7

• To reduce IT resources

• To separate the data service from the consumer

• To increase network delays

What are the two main categories of windowing strategies in streaming data systems?

• Open and Closed windows

• Static and Dynamic windows

• Tumbling and Time-based windows

• Fixed and Variable windows

What is the trigger policy in windowing techniques?

• When the window is opened for data input

• When the window size changes dynamically

• When all data in the window has to be processed

• When an event has to be removed from the window

What is a good example of a fixed time window in streaming data systems?

• Simple Moving Average

• Candlesticks

• Tumbling Window

• Sliding Time Window

What does the Simple Moving Average (SMA) function calculate in a sliding time window?

• Sum of all values in the window

• Maximum value of the window

• Minimum value of the window

• Average value of the window

What are the three semantic guarantees related to message delivery in streaming data systems?

• At most once, At least once, At most twice

• At most twice, At least once, Exactly once

• At most once, At least once, Exactly once

• At most once, At least twice, Exactly once

What is a potential application of stream analytics in clickstream/site analytics?

• Predictive maintenance

• High-frequency trading

• Identifying hot-links

• Fraud detection

What type of data stream is used in high-frequency trading?

• Stream of measures

• Stream of actions

• Stream of visitors

• Stream of stock trades