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Lessons (9)

• Rust: Ownership, Borrowing and Lifetimes

  … Nobody may keep a borrowed book after the owner has returned it. ![Ownership: one owner; many shared borrows …

• Hexagonal Architecture (Ports & Adapters)

  … Express, borrowing: ForBorrowingBooks) { app.post("/members/:memberId/loans", async (req, res) = { const loan = await borrowing.borrow(req.params …

• Debug Latency Like an Investigator

  … More app servers can mean more borrowers for the same exhausted connection pool. Prove where the wait lives …

• Storage Engines & Database Operations

  … It can create thousands of waiting borrowers. Bound pool size, reserve capacity for critical traffic, set deadlines and …

• Database Internals, Replication and Scaling

  … Connection pools bound database borrowers. Materialized views and denormalized projections speed known reads but need refresh/freshness rules …

• Choosing a Programming Language

  … Python reads like English, Go is explicit and loop-based on purpose, Rust borrows the list ( &[i64] ) instead …

• 10,000 Users Do Not Need 10,000 Database Connections

  … When that query finishes, the connection returns to the pool and another request can borrow it. HTTP concurrency …

• L6 Production Debugging Casebook

  … If reports are borrowing every database connection, isolate their pool or move them to a replica/warehouse. Alert …

• Rust: Types, Errors and Concurrency

  … config or state in a server RefCell<T Borrow rules checked at runtime Mutation behind Rc (single thread …