Senior LevelMongoDB & Mongoose
How do you analyze allPlansExecution in MongoDB explain output to evaluate index selection decisions?
❓ Interview Prompt: Explain explain("allPlansExecution"), analyzing candidate index trial runs, and understanding why specific indexes lost.
Analyzing 'explain("allPlansExecution")' displays performance stats for all candidate indexes evaluated by the query planner, revealing why non-selected indexes lost out.
Code Implementation Example
typescript
import { OrderModel } from './models/Order';
async function analyzeCandidatePlans() {
const explainResult = await OrderModel.find({ status: 'PENDING' }).explain('allPlansExecution');
console.log('Rejected Candidate Plans:', explainResult.executionStats.allPlansExecution);
}💡Evaluating candidate query plans using explain('allPlansExecution').
🎯 Interview Key Takeaway
Use explain('allPlansExecution') to inspect candidate index trial metrics and resolve query planner index selection errors.
#allPlansExecution#explain#Query Planner#Senior
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