Consider the following statements:Statement 1: An execution plan is a blueprint for evaluating a query, and is usually represented as a tree of relational operators.Statement 2: Database management system will always be efficient as compared to file system.Which of the statements is true or false?a)Statement 1 is true.b)Statement 2 is true.c)Statement 1 is false.d)Statement 2 is false.Correct answer is option 'A,D'. Can you explain this answer?

Question

Answer

Statement 1:

"An execution plan is a blueprint for evaluating a query and is usually represented as a tree of relational operators".

This statement is true. Since the execution plan of a query is the most efficient way of executing in that machine according to the optimizer.

Statement 2:

"A database management system will always be efficient as compared to a file system".

This statement is false. Consider the example for the operation/manipulation of text data that is not supported by DBMS then performing those operations/manipulations will be easier on the file system rather than with DBMS.

Hence, the correct options are (A) and (D).

Answer

Analysis of Statements
The question presents two statements related to database management systems and their execution plans. Let's break down each statement for clarity.
Statement 1: Execution Plan
- An execution plan is indeed a blueprint for evaluating a query.
- It details the steps the database will take to execute a query, including operations like scans, joins, and sorts.
- This plan is usually represented as a tree of relational operators, showcasing the sequence and methods for data retrieval.
Conclusion for Statement 1
- Statement 1 is true.
Statement 2: Database Efficiency
- While database management systems (DBMS) are generally designed for efficiency, they are not always superior to file systems in every context.
- Factors such as the specific use case, data volume, and access patterns can influence performance.
- In some scenarios, particularly with simple data storage needs, a file system may outperform a DBMS due to lower overhead.
Conclusion for Statement 2
- Statement 2 is false.
Final Answer Overview
- Therefore, the correct choices are:
- Option 'A': Statement 1 is true.
- Option 'D': Statement 2 is false.
In summary, the evaluation of the statements leads to the conclusion that while execution plans are essential components of query execution in databases, the efficiency of database systems compared to file systems is conditional and not absolute.

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