**Why it matters**: At scale, design choices directly impact reliability, latency, and cost. Wrong decisions compound across jobs and teams.
Move Databricks notebook: (1) Export/import; (2) Repos—git sync across workspaces; (3) Workspace export/import; (4) Databricks CLI. Best practice: use Repos for CI/CD; version control; use deployment workflows; test in lower env first.
**Scalability trade-offs**: Partition/parallelism limits; single points of failure; horizontal vs vertical scaling....
The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations. It covers performance optimization strategies, common pitfalls to avoid, and real-world examples from companies like TCS. The answer also includes follow-up discussion points that interviewers commonly explore.
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