Q31. What is the difference between Redis Pub/Sub and Streams?
Pub/Sub is fire-and-forget messaging. Publishers send to a channel and subscribers receive in real time, but messages are not stored. An offline subscriber misses them, a...
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Job Interview Questions and Answers Directory
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Q32. How does sharding work in MongoDB?
Sharding horizontally partitions a collection across mongos routers and shards. You choose a shard key, and MongoDB splits the key space into chunks distributed and balan...
Q33. How does the saga pattern handle distributed transactions?
A saga replaces a single ACID transaction across services with a sequence of local transactions, each publishing an event or invoking the next step. If a step fails, prev...
Q34. How do lazy loading and code splitting improve performance?
Lazy loading defers work until it is needed. For images, loading="lazy" and decoding="async" defer off-screen loads, but never lazy-load the LCP image because it delays t...
Q35. How do traits compare with interfaces in other languages?
A trait defines shared behaviour: a set of method signatures a type can implement. Implementations can be written for types you did not define, as long as you own the tra...
Q36. How does Redis Cluster provide horizontal scaling?
Redis Cluster shards data across nodes using 16384 hash slots. Each key maps to a slot via CRC16(key) mod 16384, and slots are assigned to masters. Clients may query any ...
Q37. Explain IDisposable, the using statement and finalizers.
`IDisposable` provides deterministic release of unmanaged resources through `Dispose()`. The `using` statement or declaration guarantees `Dispose` runs even if an excepti...
Q38. What is your approach to negotiating a discount request?
My starting point is that a discount is a trade, never a gift. When a buyer asks for a lower price I first understand the reason. Is it budget reality, a competing quote,...
Q39. Write a small tokenizer and explain the design choices.
A lexer converts a character stream into tokens. A hand-written tokenizer scans one character at a time and skips whitespace. ```python def tokenize(src): tokens, i = [],...
Q40. How do you use percentiles and distributions in product analysis?
Averages hide the shape of a distribution. Percentiles describe typical and extreme behaviour, which matters for user experience and capacity planning. For example, avera...