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Cache Problems interview questions

15 real Cache Problems questions from the Caching bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.

1. What is Cache stampede?

Mid
  1. A.a single popular entry receiving disproportionate traffic, overwhelming the one node responsible for it
  2. B.a failure where many concurrent requests all miss for the same expired key and simultaneously hammer the backing store to recompute it
  3. C.a surge of backend load caused when a large set of entries expire at nearly the same moment
  4. D.repeated lookups for keys that do not exist anywhere, bypassing the fast store and overloading the database every time
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2. Which term means: "a failure where many concurrent requests all miss for the same expired key and simultaneously hammer the backing store to recompute it"?

Mid
  1. A.Avalanche
  2. B.Hot key
  3. C.Penetration
  4. D.Cache stampede
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3. Which statement is correct?

Mid
  1. A.Cache stampede — repeated lookups for keys that do not exist anywhere, bypassing the fast store and overloading the database every time
  2. B.Cache stampede — a single popular entry receiving disproportionate traffic, overwhelming the one node responsible for it
  3. C.Cache stampede — a failure where many concurrent requests all miss for the same expired key and simultaneously hammer the backing store to recompute it
  4. D.Cache stampede — a surge of backend load caused when a large set of entries expire at nearly the same moment
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4. What is Penetration?

Senior
  1. A.many waiters waking and competing at once when a single contended resource becomes available or its entry is regenerated
  2. B.a failure where many concurrent requests all miss for the same expired key and simultaneously hammer the backing store to recompute it
  3. C.repeated lookups for keys that do not exist anywhere, bypassing the fast store and overloading the database every time
  4. D.a surge of backend load caused when a large set of entries expire at nearly the same moment
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6. Which statement is correct?

Senior
  1. A.Penetration — many waiters waking and competing at once when a single contended resource becomes available or its entry is regenerated
  2. B.Penetration — repeated lookups for keys that do not exist anywhere, bypassing the fast store and overloading the database every time
  3. C.Penetration — a surge of backend load caused when a large set of entries expire at nearly the same moment
  4. D.Penetration — a single popular entry receiving disproportionate traffic, overwhelming the one node responsible for it
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7. What is Avalanche?

Senior
  1. A.a failure where many concurrent requests all miss for the same expired key and simultaneously hammer the backing store to recompute it
  2. B.repeated lookups for keys that do not exist anywhere, bypassing the fast store and overloading the database every time
  3. C.a surge of backend load caused when a large set of entries expire at nearly the same moment
  4. D.a single popular entry receiving disproportionate traffic, overwhelming the one node responsible for it
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9. Which statement is correct?

Senior
  1. A.Avalanche — a failure where many concurrent requests all miss for the same expired key and simultaneously hammer the backing store to recompute it
  2. B.Avalanche — many waiters waking and competing at once when a single contended resource becomes available or its entry is regenerated
  3. C.Avalanche — a surge of backend load caused when a large set of entries expire at nearly the same moment
  4. D.Avalanche — a single popular entry receiving disproportionate traffic, overwhelming the one node responsible for it
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10. What is Hot key?

Mid
  1. A.a single popular entry receiving disproportionate traffic, overwhelming the one node responsible for it
  2. B.a failure where many concurrent requests all miss for the same expired key and simultaneously hammer the backing store to recompute it
  3. C.repeated lookups for keys that do not exist anywhere, bypassing the fast store and overloading the database every time
  4. D.many waiters waking and competing at once when a single contended resource becomes available or its entry is regenerated
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12. Which statement is correct?

Mid
  1. A.Hot key — a single popular entry receiving disproportionate traffic, overwhelming the one node responsible for it
  2. B.Hot key — repeated lookups for keys that do not exist anywhere, bypassing the fast store and overloading the database every time
  3. C.Hot key — a surge of backend load caused when a large set of entries expire at nearly the same moment
  4. D.Hot key — a failure where many concurrent requests all miss for the same expired key and simultaneously hammer the backing store to recompute it
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13. What is Thundering herd?

Senior
  1. A.repeated lookups for keys that do not exist anywhere, bypassing the fast store and overloading the database every time
  2. B.a single popular entry receiving disproportionate traffic, overwhelming the one node responsible for it
  3. C.a surge of backend load caused when a large set of entries expire at nearly the same moment
  4. D.many waiters waking and competing at once when a single contended resource becomes available or its entry is regenerated
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15. Which statement is correct?

Senior
  1. A.Thundering herd — a surge of backend load caused when a large set of entries expire at nearly the same moment
  2. B.Thundering herd — a failure where many concurrent requests all miss for the same expired key and simultaneously hammer the backing store to recompute it
  3. C.Thundering herd — many waiters waking and competing at once when a single contended resource becomes available or its entry is regenerated
  4. D.Thundering herd — a single popular entry receiving disproportionate traffic, overwhelming the one node responsible for it
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