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Question 1 List the advantages and disadvantages of storing more than one relation in one file. Question 2 In the variable-length record representation, if the value is null and null bitmap is used what would be stored in the offset and length fields?

Question 1 List the advantages and disadvantages of storing more than one relation in one file. Question 2 In the variable-length record representation, if the value is null and null bitmap is used what would be stored in the offset and length fields?

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Hello I would like to solve this homework today in detail, please Question 1 List the advantages and disadvantages of storing more than one relation in one file. Question 2 In the variable-length record representation, if the value is null and null bitmap is used what would be stored in the offset and length fields? Question 3 Given The following current state of extendable hash index of relation R; insert 3 then 10 to the hash table where: H(0) = 0000 H(8) = 1000 H(2) = 0010 H(10) = 1010 H(3) = 0011 Note that, the first i high order bits are used as a displacement into a bucket and the bucket can hold up to 2 records. Show your steps. 0 1 1 1 0 1 8 2
Transcribed Image Text:Hello I would like to solve this homework today in detail, please Question 1 List the advantages and disadvantages of storing more than one relation in one file. Question 2 In the variable-length record representation, if the value is null and null bitmap is used what would be stored in the offset and length fields? Question 3 Given The following current state of extendable hash index of relation R; insert 3 then 10 to the hash table where: H(0) = 0000 H(8) = 1000 H(2) = 0010 H(10) = 1010 H(3) = 0011 Note that, the first i high order bits are used as a displacement into a bucket and the bucket can hold up to 2 records. Show your steps. 0 1 1 1 0 1 8 2
Question 4 Assume you have a database relation file R (a, b, c) which a is a primary key attribute and b is a secondary key attribute that have the following properties: • Each disk block stores B = 3,704 bytes. • The data file has 270,000 records, each record has size of 100 bytes and Sequentially ordered on the attribute a. • A dense index on attribute b has been created. Each index entry occupies 15 bytes: 9 bytes for search key, and 6 bytes for record pointer How many block access is needed to search for a record with: Case 1: specific attribute a using original file. Case 2: specific attribute b using the original file. Case 3: specific attribute c using the original file. Case 4: specific attribute b using index file.
Transcribed Image Text:Question 4 Assume you have a database relation file R (a, b, c) which a is a primary key attribute and b is a secondary key attribute that have the following properties: • Each disk block stores B = 3,704 bytes. • The data file has 270,000 records, each record has size of 100 bytes and Sequentially ordered on the attribute a. • A dense index on attribute b has been created. Each index entry occupies 15 bytes: 9 bytes for search key, and 6 bytes for record pointer How many block access is needed to search for a record with: Case 1: specific attribute a using original file. Case 2: specific attribute b using the original file. Case 3: specific attribute c using the original file. Case 4: specific attribute b using index file.
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