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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Choose the answer(s) that is/are true when filling in this statement. A non-dense index has an index entry for every distinct value of the attribute we are indexing on. O An index entry for each disk block used for the record storage. O an index entry for every candidate key attribute of the file. O an index entry for each record stored in each block.
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Suppose we have a record file constructed according to the SimpleDB specificapoints) Suppose we have a record file constructed according to the SimpleDB specifications. That is, the block size is 400 bytes, an integer occupies 4 bytes, a string requires an integer length plus one byte per character, and each slot of a record page has an integer INUSE/EMPTY flag; records do not span multiple pages. For each of the tables in the sample database (and assuming there are many records in each table, not just the given sample data), determine how many records will fit per block (be sure to show your calculations). Is there any wasted space in any of the blocks?tions. That is, the block size is 400 bytes, an integer occupies 4 bytes, a string requires an integer length plus one byte per character, and each slot of a record page has an integer INUSE/EMPTY flag; records do not span multiple pages. For each of the tables in the sample database (and assuming there are many records in each table,…
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Styles Consider the following database instance. Table name: Students Primary key: sid Sid udej6 sname Ricky Ellen 2. 6. 4 MaryLou Ellen Table name: Courses Primary key: cid cid C1 cname ICS Finance 2. Table name: Register Primary key: sid.cid Foreign key: sid references Students(sid) Foreign key: cid references Courses(cid) sid cid 2 2. 1 1 5.1) For each of the following statements, show whether the statement is correctly executed or not (assume that the statements are executed in order, which means that if a statement is correctly executed, its effect is reflected in the following statement). If you say the statement is not executed, explain why. INSERT INTO Students VALUES (3, Ellen'); b. INSERT INTO Students VALUES (6, Ellen'); DFocL 727
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We have a database file with ten million pages (N = 10,000,000 pages), and we want to sort it using external merge sort. Assume that the DBMS uses quicksort for in- memory sorting. Let B denote the number of buffers. What is the smallest number of buffers B that the DBMS can sort the target file using only four passes?
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