Solution

The correct answer is C, A, D, B

Key Points

To arrange the steps of processing a high-level query in the correct order, let's understand the logical sequence:

• Scanning, Parsing, and Validating (C)
  • The first step is to scan the query, parse it to understand its structure, and validate it to ensure it follows the correct syntax.
• Query Optimizer (A)
  • Once the query is validated, the query optimizer comes into play to find the most efficient way to execute the query.
• Query Code Generator (D)
  • After optimization, the query code generator translates the optimized query plan into executable code.
• Runtime Database Processor (B)
  • Finally, the runtime database processor executes the generated code to retrieve the required data from the database.

So, the correct order is: C, A, D, B