Assume a database has N = 14,000,000 pages, and the manager is trying to use external merge sort algorithm to sort it. The DBMS did not apply double buffer or blocked I/O, it use quicksort for in- memory sorting If the DBMS has 8 buffers. Q1. Based on Lecture 8 (sorting), in order to sort the file, how many passes do we need? A.8 B.9 C.10 D.11 Q2. based on Lecture 8 (sorting), in order to sort the file, What is the total I/O cost? A. 224,000,000 B. 252,000,000 C. 280,000,000 D. 308,000,000 A.7 B.8 C.9 D.10 Q3. What is the smallest number of buffers that the DBMS can sort the target file using 8 passes?

Assume a database has N = 14,000,000 pages, and the manager is trying to use external merge sort algorithm to sort it. The DBMS did not apply double buffer or blocked I/O, it use quicksort for in- memory sorting If the DBMS has 8 buffers. Q1. Based on Lecture 8 (sorting), in order to sort the file, how many passes do we need? A.8 B.9 C.10 D.11 Q2. based on Lecture 8 (sorting), in order to sort the file, What is the total I/O cost? A. 224,000,000 B. 252,000,000 C. 280,000,000 D. 308,000,000 A.7 B.8 C.9 D.10 Q3. What is the smallest number of buffers that the DBMS can sort the target file using 8 passes?

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Types of database architectures

A Database Architecture represents the Database Management System’s (DBMS) design (schema). The DBMS architecture makes it easy to understand the components involved in the database system and their relations. The DBMS architecture may vary based on the system on which it runs. Some systems contain both client and server machines whereas some run only on a server machine. Based on the architecture, the system can be classified as centralized, decentralized, or hierarchical.

Question

**Assumption and Context:**
- A database consists of N = 14,000,000 pages.
- The manager opts to use an external merge sort algorithm for sorting.
- The DBMS does not employ double buffering or blocked I/O, utilizing quicksort for in-memory sorting.
- The DBMS has 8 buffers available.

**Questions:**

**Q1:** Based on Lecture 8 (sorting), to sort the file, how many passes are needed?
- A. 8
- B. 9
- C. 10
- D. 11

**Q2:** Based on Lecture 8 (sorting), to sort the file, what is the total I/O cost?
- A. 224,000,000
- B. 252,000,000
- C. 280,000,000
- D. 308,000,000

**Q3:** What is the smallest number of buffers needed for the DBMS to sort the target file using 8 passes?
- A. 7
- B. 8
- C. 9
- D. 10

**Notes:**
- The lecture refers to the principles of sorting and efficient ways to manage I/O operations during sorting.
- Readers should refer to Lecture 8 for calculating the number of passes and understanding the computation of I/O costs associated with sorting large data using limited buffers.

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