Observe the HOMETOWN REALESTATE database: SELLER SellerID SellerName RealtorID S111 Paul R1 S222 Carly R1 S333 Ana R2 S444 Charlotte R2 S555 Aidan R3 Có66 Eric R1 C777 Christina R1 REALTOR RealtorID RealtorName R1 Claire R2 Kate R3 Cliff R4 William If a DBMS enforces a DELETE CASCADE option on the referential integrity constraint between SELLER and REALTOR in the HOMETOWN REALESTATE database, what will be the outcome after a user tries to delete the third record (R3, Cliff) from REALTOR? O SELLER will have 7 records, REALTOR will have 4 records O SELLER will have 6 records, REALTOR will have 3 records O SELLER will have 7 records, REALTOR will have 3 records O SELLER will have 6 records, REALTOR will have 4 records O SELLER will have 3 records, REALTOR will have 3 records

Observe the HOMETOWN REALESTATE database: SELLER SellerID SellerName RealtorID S111 Paul R1 S222 Carly R1 S333 Ana R2 S444 Charlotte R2 S555 Aidan R3 Có66 Eric R1 C777 Christina R1 REALTOR RealtorID RealtorName R1 Claire R2 Kate R3 Cliff R4 William If a DBMS enforces a DELETE CASCADE option on the referential integrity constraint between SELLER and REALTOR in the HOMETOWN REALESTATE database, what will be the outcome after a user tries to delete the third record (R3, Cliff) from REALTOR? O SELLER will have 7 records, REALTOR will have 4 records O SELLER will have 6 records, REALTOR will have 3 records O SELLER will have 7 records, REALTOR will have 3 records O SELLER will have 6 records, REALTOR will have 4 records O SELLER will have 3 records, REALTOR will have 3 records

Database Systems: Design, Implementation, & Management

11th Edition

ISBN:9781285196145

Author:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel

Publisher:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel

Chapter10: Transaction Management And Concurrency Control

Section: Chapter Questions

Problem 1P

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If a DBMS enforces a DELETE CASCADE option on the referential integrity constraint between SELLER and REALTOR in the HOMETOWN REALESTATE database, what will be the outcome after a user tries to delete the first record (R1, Claire) from REALTOR? Group of answer choices SELLER will have 7 records, REALTOR will have 4 records SELLER will have 6 records, REALTOR will have 3 records SELLER will have 7 records, REALTOR will have 3 records SELLER will have 3 records, REALTOR will have 3 records
The SQL instruction CREATE TABLE T1 (A1 CHAR(5) NOT NULL, A2 INTEGER NOT NULL, A3 CHAR(5), PRIMARY KEY (A1), FOREIGN KEY (A2) REFERENCES T2, ON DELETE SET DEFAULT); (a) It creates the table T1 in which any delete operation on either T1 or T2 violating the referential integrity constraint causes the insertion of default values in the corresponding attributes of the other table (b) It creates the table T1 in which any delete operation on T2 violating the referential integrity constraint causes the insertion of default values in the corresponding T1 attributes (c) none of the answers are correct (d) It creates the table T1 in which any delete operation on T1 violating the referential integrity constraint causes the insertion of default values in the corresponding attributes of T2
You are given the following database schema:Sailors(sid, sname, rating, age)Boats(bid, bname, color)Reserves(sid, bid, day)Consider the join on Sailors ▷◁ Reserves and assume that you have the following statistics andlimitations: * You have available 9 pages in main memory.* Sailors: 100000 tuples, 1000 pages; Boats: 2000 tuples, 10 pages; Reserves: 110000 tuples,550 pages 1. Calculate the I/O cost of this join using the Block Nested Loop algorithm?
Start a database transaction. Next time we meet, we'll be optimistic.
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You are given the following database schema:Sailors(sid, sname, rating, age)Boats(bid, bname, color)Reserves(sid, bid, day)Consider the join on Sailors ▷◁ Reserves and assume that you have the following statistics andlimitations: * You have available 9 pages in main memory.* Sailors: 100000 tuples, 1000 pages; Boats: 2000 tuples, 10 pages; Reserves: 110000 tuples,550 pages 1. Calculate the I/O cost of this join using the Block Nested Loop algorithm? 2. Calculate the I/O cost of sorting the Sailors relation?
Suppose each of the following update operations is applied directly to the below database state.Discuss which integrity constraints were violated by each operation and how you can enforce theseconstraints to ensure no violation occurs. If an operation does not violate any constraints, brieflyexplain why. a) Insert <’D1’, 'Stafford'> into Department_Locations tableb) Insert <6, ‘Stafford’> into Department_Locations tablec) Insert <null, ‘Stafford’> into Department_Locations table
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This is my attempt at DBDL statements trying to plan a database in MySQL. Employers: CREATE TABLE Employers ( EmployerID INT PRIMARY KEY, CompanyName VARCHAR(255), Location VARCHAR(255), ContactInfo VARCHAR(255), ); Customers: CREATE TABLE Customers ( CustomerID INT PRIMARY KEY, Name VARCHAR(255), ContactInfo VARCHAR(255), Education VARCHAR(255), Experience INT ); Reference: CREATE TABLE References ( ReferenceID INT PRIMARY KEY, Name VARCHAR(255), ContactInfo VARCHAR(255), RelationshipToCustomer VARCHAR(255) ); Skills: CREATE TABLE Skills ( SkillID INT PRIMARY KEY, SkillName VARCHAR(255), ProficiencyLevel VARCHAR(255) ); EmploymentPositions: CREATE TABLE EmploymentPositions ( PositionID INT PRIMARY KEY, PostionTitle VARCHAR(255), EmployerID INT, Duration VARCHAR(255), FOREIGN KEY (EmployerID) REFERENCES Employers(EmployerID) ); Interviews: CREATE TABLE Interviews ( InterviewID INT PRIMARY KEY, InterviewDate DATE, Interviewer VARCHAR(255), Feedback VARCHAR(255) ); HiringStatus:…

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