________ is the process of attempting to improve the query performance of a relational database by...
________ is the process of attempting to improve the query performance of a relational database by merging tables together, incorporating redundant data, or grouping existing data values. Select one: a. Normalization b. Optimization c. Denormalization d. Deoptimization
Homework Answers
Denormalization is a database optimization technique in which we
add redundant data to one or more tables. This can help us avoid
costly joins in a relational database
Answer: c) Denormalization
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________ is the process of attempting to improve the query
performance of a relational database by...
**************PLEASE COMPLETE PART F) ONLY************** Consider the following relational database schema (primary keys are underlined) and...
**************PLEASE COMPLETE PART F) ONLY************** Consider the following relational database schema (primary keys are underlined) and SQL query: Hotel (hotelNo, hotelName, city) Room (roomNo, hotelNo, type, price) Booking (hotelNo, guestNo, dateFrom, dateTo, roomNo) Guest (guestNo, guestName, guestAddress) SELECT g.guestNo, g.guestName FROM Room r, Booking b, Hotel h, Guest g WHERE h.hotelNo = b.hotelNo AND g.guestNo = b.guestNo AND h.hotelNo = r.hotelNo AND h.hotelName = "Ritz" AND dateFrom >= "Jan 01, 2001" AND dateTo <= "Dec 31, 2001"; (A) state what...
**************PLEASE COMPLETE PART E) ONLY************** Consider the following relational database schema (primary keys are underlined) and...
**************PLEASE COMPLETE PART E) ONLY************** Consider the following relational database schema (primary keys are underlined) and SQL query: Hotel (hotelNo, hotelName, city) Room (roomNo, hotelNo, type, price) Booking (hotelNo, guestNo, dateFrom, dateTo, roomNo) Guest (guestNo, guestName, guestAddress) SELECT g.guestNo, g.guestName FROM Room r, Booking b, Hotel h, Guest g WHERE h.hotelNo = b.hotelNo AND g.guestNo = b.guestNo AND h.hotelNo = r.hotelNo AND h.hotelName = "Ritz" AND dateFrom >= "Jan 01, 2001" AND dateTo <= "Dec 31, 2001"; (A) state what...
Accounting Info Systems A. True B. False 10. Tables in a relational database are documented by a data flow diagram. A. True B. False 11. In database design, the recommended step after ER Diagram...
Accounting Info Systems
A. True B. False 10. Tables in a relational database are documented by a data flow diagram. A. True B. False 11. In database design, the recommended step after ER Diagram is A. Relational schema B. Database implementation C. Either of the above D. None of the above The next 2 questions refer to binary relationships. 12. One to many ER have diagram will havetables in the relational schema. A. One B. Two C. Three D. More...
6. With respect to database systems, which of the following statement(s) is (are) true? a. The...
6. With respect to database systems, which of the following statement(s) is (are) true? a. The physical view of data is how people conceptually organize and understand the relationships among data items. b. The DML builds the data dictionary, creates the database, describes logical views for each user, and specifies security constraints. c. A record layout shows the items stored in a file, including the type of data stored and both the order and length of the data fields. d....
QUESTION 1 What is the most common relationship within a relational database? Select the best answer...
QUESTION 1 What is the most common relationship within a relational database? Select the best answer from the following. One-To-One relationship. o One-To-Many relationship. Many-To-Many relationship. Zero-To-Zero relationship. QUESTION 2 What is an "entity'? Select the best answer from the following. An entity, for our purposes, is the same as a table in the database. An entity represents one of the columns in an individual table. There are no entities in a relational database. Entities are only part of NoSQL...
I need a response in your opinion, from this answer Q1. Any user accessing the database is more i...
I need a response in your opinion, from this answer Q1. Any user accessing the database is more interested in quick and correct result than how a database is designed. Hence if we introduce redundancy in the table and if the performance of the query increases, then we can ignore 3NF. This is known as denormalization. In this process, a normalized table will be rejoined to have the redundancy in the table to increase the performance of the query. Denormalization...
17. The select operation: A) combines relational tables to provide the user with more information than...
17. The select operation: A) combines relational tables to provide the user with more information than is otherwise available. B) creates a subset consisting of columns in a table. C) identifies the table from which the columns will be selected. D) creates a subset consisting of all records in the file that meet stated criteria. 18. The join operation: A) combines relational tables to provide the user with more information than is otherwise available. B) creates a subset consisting of...
The relational schema for the Academics database is as follows DEPARTMENT(deptnum, descrip, instname, deptname, state,...
The relational schema for the Academics database is as follows DEPARTMENT(deptnum, descrip, instname, deptname, state, postcode) ACADEMIC(acnum, deptnum*, famname, givename, initials, title) PAPER(panum, title) FIELD(fieldnum, id, title) INTEREST(fieldnum* acnumk, descrip) Some notes on the Academics database An academic department belongs to one institution (instname) and often has many academics. An academic only works for one department. Research papers (PAPER) are often authored by several academics, and of course an academic often writes several papers (AUTHOR) A research field (FIELD) often...
subject. Database system i need the answer for 8 & 9 please. 8. Improve the performance and backup plan for the CUNY database. This database student records enrolled in 24 Colleges. Propose...
subject. Database system
i need the answer for 8 & 9 please.
8. Improve the performance and backup plan for the CUNY database. This database student records enrolled in 24 Colleges. Propose four recommendations to correct or ems identified. You have no budget to purchase additional hardware. You need to make recommendations using hardware already available (15 points) includes 400,000 You will be evaluated based on your improvements in a) performance, b) security, c) backup and d) hardware utilization. You...
24) A key that contains more than one attribute is called a(n) A) composite key B)...
24) A key that contains more than one attribute is called a(n) A) composite key B) complex key C) multi-key D) n-key E) candidate key 25) Null values can cause problems because they are ambiguous. True False 26) In the normalization process, it is necessary to identify all the determinants in a relation. True False 27) To represent a relationship in the relational model, the primary key of one relation is placed into a second relation. True False 28) A...
Accounting Info Systems
A. True B. False 10. Tables in a relational database are documented by a data flow diagram. A. True B. False 11. In database design, the recommended step after ER Diagram is A. Relational schema B. Database implementation C. Either of the above D. None of the above The next 2 questions refer to binary relationships. 12. One to many ER have diagram will havetables in the relational schema. A. One B. Two C. Three D. More...
6. With respect to database systems, which of the following statement(s) is (are) true? a. The physical view of data is how people conceptually organize and understand the relationships among data items. b. The DML builds the data dictionary, creates the database, describes logical views for each user, and specifies security constraints. c. A record layout shows the items stored in a file, including the type of data stored and both the order and length of the data fields. d....
QUESTION 1 What is the most common relationship within a relational database? Select the best answer from the following. One-To-One relationship. o One-To-Many relationship. Many-To-Many relationship. Zero-To-Zero relationship. QUESTION 2 What is an "entity'? Select the best answer from the following. An entity, for our purposes, is the same as a table in the database. An entity represents one of the columns in an individual table. There are no entities in a relational database. Entities are only part of NoSQL...
17. The select operation: A) combines relational tables to provide the user with more information than is otherwise available. B) creates a subset consisting of columns in a table. C) identifies the table from which the columns will be selected. D) creates a subset consisting of all records in the file that meet stated criteria. 18. The join operation: A) combines relational tables to provide the user with more information than is otherwise available. B) creates a subset consisting of...
The relational schema for the Academics database is as follows DEPARTMENT(deptnum, descrip, instname, deptname, state, postcode) ACADEMIC(acnum, deptnum*, famname, givename, initials, title) PAPER(panum, title) FIELD(fieldnum, id, title) INTEREST(fieldnum* acnumk, descrip) Some notes on the Academics database An academic department belongs to one institution (instname) and often has many academics. An academic only works for one department. Research papers (PAPER) are often authored by several academics, and of course an academic often writes several papers (AUTHOR) A research field (FIELD) often...
subject. Database system
i need the answer for 8 & 9 please.
8. Improve the performance and backup plan for the CUNY database. This database student records enrolled in 24 Colleges. Propose four recommendations to correct or ems identified. You have no budget to purchase additional hardware. You need to make recommendations using hardware already available (15 points) includes 400,000 You will be evaluated based on your improvements in a) performance, b) security, c) backup and d) hardware utilization. You...
24) A key that contains more than one attribute is called a(n) A) composite key B) complex key C) multi-key D) n-key E) candidate key 25) Null values can cause problems because they are ambiguous. True False 26) In the normalization process, it is necessary to identify all the determinants in a relation. True False 27) To represent a relationship in the relational model, the primary key of one relation is placed into a second relation. True False 28) A...
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