Use Cases interview questions

1. A.coordinating exclusive access across processes by atomically setting a uniquely-tagged key with an expiry to avoid deadlock
2. B.a unique random value stored with a mutual-exclusion key so only the holder can safely release it and never another client's
3. C.capping how many actions a client may perform in a window by atomically incrementing a counter that expires
4. D.keeping per-user web session state in memory with automatic lifespan so logins expire without manual cleanup

Answer + AI explanation with Pro

1. A.Rate limiting
2. B.Session store
3. C.Leaderboard
4. D.Distributed lock

Answer + AI explanation with Pro

1. A.Session store — capping how many actions a client may perform in a window by atomically incrementing a counter that expires
2. B.Session store — a unique random value stored with a mutual-exclusion key so only the holder can safely release it and never another client's
3. C.Session store — keeping per-user web session state in memory with automatic lifespan so logins expire without manual cleanup
4. D.Session store — ranking players or items by score using a structure that returns top-N and individual rank in logarithmic time

Answer + AI explanation with Pro

1. A.keeping per-user web session state in memory with automatic lifespan so logins expire without manual cleanup
2. B.capping how many actions a client may perform in a window by atomically incrementing a counter that expires
3. C.ranking players or items by score using a structure that returns top-N and individual rank in logarithmic time
4. D.coordinating exclusive access across processes by atomically setting a uniquely-tagged key with an expiry to avoid deadlock

Answer + AI explanation with Pro

1. A.Lock ownership token
2. B.Distributed lock
3. C.Session store
4. D.Leaderboard

Answer + AI explanation with Pro

1. A.Leaderboard — a unique random value stored with a mutual-exclusion key so only the holder can safely release it and never another client's
2. B.Leaderboard — coordinating exclusive access across processes by atomically setting a uniquely-tagged key with an expiry to avoid deadlock
3. C.Leaderboard — capping how many actions a client may perform in a window by atomically incrementing a counter that expires
4. D.Leaderboard — ranking players or items by score using a structure that returns top-N and individual rank in logarithmic time

Answer + AI explanation with Pro

1. A.ranking players or items by score using a structure that returns top-N and individual rank in logarithmic time
2. B.a unique random value stored with a mutual-exclusion key so only the holder can safely release it and never another client's
3. C.capping how many actions a client may perform in a window by atomically incrementing a counter that expires
4. D.coordinating exclusive access across processes by atomically setting a uniquely-tagged key with an expiry to avoid deadlock

Answer + AI explanation with Pro

1. A.Lock ownership token
2. B.Distributed lock
3. C.Session store
4. D.Rate limiting

Answer + AI explanation with Pro

1. A.Rate limiting — a unique random value stored with a mutual-exclusion key so only the holder can safely release it and never another client's
2. B.Rate limiting — coordinating exclusive access across processes by atomically setting a uniquely-tagged key with an expiry to avoid deadlock
3. C.Rate limiting — capping how many actions a client may perform in a window by atomically incrementing a counter that expires
4. D.Rate limiting — ranking players or items by score using a structure that returns top-N and individual rank in logarithmic time

Answer + AI explanation with Pro

1. A.capping how many actions a client may perform in a window by atomically incrementing a counter that expires
2. B.ranking players or items by score using a structure that returns top-N and individual rank in logarithmic time
3. C.a unique random value stored with a mutual-exclusion key so only the holder can safely release it and never another client's
4. D.coordinating exclusive access across processes by atomically setting a uniquely-tagged key with an expiry to avoid deadlock

Answer + AI explanation with Pro

1. A.Session store
2. B.Lock ownership token
3. C.Rate limiting
4. D.Distributed lock

Answer + AI explanation with Pro

1. A.Distributed lock — coordinating exclusive access across processes by atomically setting a uniquely-tagged key with an expiry to avoid deadlock
2. B.Distributed lock — a unique random value stored with a mutual-exclusion key so only the holder can safely release it and never another client's
3. C.Distributed lock — ranking players or items by score using a structure that returns top-N and individual rank in logarithmic time
4. D.Distributed lock — capping how many actions a client may perform in a window by atomically incrementing a counter that expires

Answer + AI explanation with Pro

1. A.capping how many actions a client may perform in a window by atomically incrementing a counter that expires
2. B.ranking players or items by score using a structure that returns top-N and individual rank in logarithmic time
3. C.coordinating exclusive access across processes by atomically setting a uniquely-tagged key with an expiry to avoid deadlock
4. D.a unique random value stored with a mutual-exclusion key so only the holder can safely release it and never another client's

Answer + AI explanation with Pro

1. A.Leaderboard
2. B.Rate limiting
3. C.Lock ownership token
4. D.Session store

Answer + AI explanation with Pro

1. A.Lock ownership token — capping how many actions a client may perform in a window by atomically incrementing a counter that expires
2. B.Lock ownership token — keeping per-user web session state in memory with automatic lifespan so logins expire without manual cleanup
3. C.Lock ownership token — a unique random value stored with a mutual-exclusion key so only the holder can safely release it and never another client's
4. D.Lock ownership token — coordinating exclusive access across processes by atomically setting a uniquely-tagged key with an expiry to avoid deadlock

Answer + AI explanation with Pro