Follow-up · depth 5
What trade-offs come with Query Execution Plans?
What trade-offs come with Query Execution Plans?
Answers use simple, clear English.
Quick interview answer
Pros: Visual plan reveals missing indexes and bad estimates. Cons: Plans vary by engine; hints are last resort.
Detailed answer
Trade-offs for Query Execution Plans: Pros: Visual plan reveals missing indexes and bad estimates. Cons: Plans vary by engine; hints are last resort. Decision rule: choose Query Execution Plans when the benefits outweigh operational cost for your SLO. Parent context: Baseline: Optimizer chooses join order, access paths (seek vs scan), and algorithms (hash vs merge join). EXPLAIN/EXPLAIN ANALYZE shows estimated vs actual rows — key for tuning.
Full explanation
Strong answers state both sides and when you would pick an alternative. Pros: Visual plan reveals missing indexes and bad estimates. Cons: Plans vary by engine; hints are last resort.
Follow-up questions
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Parent context — Query Execution Plans
Baseline: Optimizer chooses join order, access paths (seek vs scan), and algorithms (hash vs merge join). EXPLAIN/EXPLAIN ANALYZE shows estimated vs actual rows — key for tuning.
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