Technical interview questions and drills

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ADO.NET connection pooling and pool exhaustion

Explains physical connection reuse, pool partitioning, short ownership, exhaustion causes, diagnostics, and why increasing the pool is not the first fix.

.NETSQL Server

Practice drill

Comparison questionMedium~7 min

Drills

ADO.NET connection pooling and pool exhaustion

ASP.NET Core output caching vs HTTP response caching

Cache API responses versus domain objects

Choose a TTL and expiration strategy for cached data

Compare cache-aside, read-through, and write-through caching

Compare in-memory cache and distributed cache

Diagnose high CPU with dotnet-trace

Explain stale data and eventual consistency in caching

IHttpClientFactory, handler lifetime, DNS, and socket reuse

Invalidate cached data safely after writes

Prove ThreadPool starvation with counters, stacks, and traces

Serialize and version cached Redis values safely

Stream large HTTP responses without buffering

Triage a .NET service with dotnet-counters

Use cache-aside for a read-heavy API endpoint