What is the primary trade-off of using an event-driven, single-threaded architecture (like Node.js) compared to multi-threaded servers?

In a confusion matrix, 'precision' is calculated as:

What is 'thrashing' in virtual memory systems?

Which statistic is least affected by extreme outliers?

Which data structure would you choose to implement an autocomplete feature?

What is a context switch?

Which browser storage mechanism is automatically sent with HTTP requests?

Which metric is most appropriate for evaluating a regression model's performance?

What does the 'I' in ACID database properties stand for?

Which traversal of a Binary Search Tree produces sorted output?

A developer changes a single function and unexpectedly breaks five unrelated features. Which design issue is MOST likely present?

What is the primary purpose of a load balancer?

A computer has multiple CPU cores, but a program only uses one core. Which change is MOST likely to improve performance?

Why do databases use transactions?

Why is a model evaluated on data it has never seen before?

A website loads slowly because it requests 500 small images. What is the main issue?

What problem was DNS primarily created to solve?

What does high variance usually indicate?

What is the output of this code?
x = [1, 2, 3]
y = x y.append(4) print(len(x))

Two transactions modify the same record simultaneously and produce inconsistent results. What issue occurred?

Why is debouncing often used for search bars?