We ran a campus ticket booking system for our college fest. Everything was fine in testing with 50 users. As soon as 2,000 students refreshed at 10 AM, the server froze. PostgreSQL was doing sequential table scans on `orders.user_id` for every check. One simple `CREATE INDEX` reduced query latency from 12,000ms to 4ms. Always index your foreign keys!

Question: 'Estimate the number of cups of tea consumed daily on your university campus.' 1. State clarifying assumptions (campus student population = 6,000; hosteler vs day scholar split = 80/20). 2. Segment by user personas (non-tea drinkers = 30%, light drinkers = 1 cup/day, heavy exam grinders = 3 cups/day). 3. Add faculty and canteen footfall. 4. Sanity check with canteen vendor batch sizes. Interviewers care about structured logic, not the exact number.

Each PostgreSQL backend connection is an independent operating system process allocating ~10MB of RAM and competing for CPU scheduler time. Using connection poolers like PgBouncer or Neon connection pooling caps concurrent connections at ~50 while queuing burst requests. Better throughput, zero server crashes.

When a process references memory, the CPU's MMU uses page tables to translate the virtual address to a physical RAM frame. If the present bit is 0, the CPU triggers a page fault interrupt. The OS pauses the thread, fetches the 4KB block from swap disk into RAM, updates the page table, and resumes the instruction. That is why excessive swapping grinds your computer to a halt.

When you type `campusloop.space`: 1. Browser checks local cache 2. Queries Recursive Resolver (ISP or 1.1.1.1) 3. Resolver asks Root Nameserver -> TLD Nameserver (.space) -> Authoritative Nameserver 4. Authoritative nameserver returns the IP address A-record. All within 15 milliseconds across global fiber cables.

I can’t take it anymore. People outside think NIT Warangal is a top-3, Tier-1 institute, but living here is an absolute nightmare. 1. Basic Infrastructure Failures (No tables, no chairs, broken toilets) No Basic Amenities: We haven't even been provided basic study tables and chairs in our hostel rooms. How is a student supposed to study or sit comfortably in their own room? Sanitation Crisis: The hostel toilets are biohazards. Flushes don't work, jet sprays are completely broken, a

If you call `delay(1000)` inside `loop()`, your ESP32 drops incoming WebSocket packets and freezes HTTP server tasks. Instead, pin sensor polling to Core 0 with `xTaskCreatePinnedToCore()` and let the network stack handle incoming requests on Core 1. Dual-core microcontrollers should be treated like concurrent systems!

In India, network connectivity drops every time you enter a basement elevator, train tunnel, or hostel bathroom. Building apps that immediately crash with 'No Internet' is terrible UX. Store state locally with SQLite / WatermelonDB and sync background mutations with exponential backoff when connectivity restores.

For students wanting to build apps quickly for hackathons and startup MVPs, Flutter's cross-platform speed is unbeatable. But if your goal is Big Tech mobile engineering roles, Kotlin and Jetpack Compose are what recruiters search for. Don't let influencers confuse you — pick based on your immediate objective.

Classic computer architecture experiment: Iterate over 100,000 integers and conditionally sum elements > 128. If the array is unsorted, the CPU's branch predictor misses 50% of the time, stalling the instruction pipeline. If the array is sorted, branch prediction accuracy is ~99%, and execution runs 6x faster. Understanding hardware mechanics makes you a dramatically better programmer.