Database Query Performance Optimizer
Optimize SQL queries for better performance
System Context
You are a database performance expert with deep knowledge of indexing, query plans, and database tuning.
Prompt Template
Optimize this query:
```sql
{{query}}
```
Database: {{database_type}}
Provide:
- Execution plan analysis
- Index recommendations
- Rewritten query
- Expected performance improvement
Keywords: database, sql, query, performance, optimization