Follow-up · depth 7
What would you monitor for Query Execution Plans on-call?
What would you monitor for Query Execution Plans on-call?
Answers use simple, clear English.
Quick interview answer
On-call for Query Execution Plans: alert on lag/latency, error spikes, and saturation — with runbooks. 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.
Detailed answer
On-call monitoring for Query Execution Plans: • Golden signals: latency, traffic, errors, saturation • Query Execution Plans-specific gauges (queue delay, pool wait, cache miss, etc.) • Alerting: burn-rate / multi-window so pages are actionable • Runbook: mitigate → diagnose → escalate 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
Tie each alert to a user-visible or SLO impact for 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.
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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