Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Fundamentals of Input and Output Performance
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please solve qn f.
Consider a disk with block size B = 512 bytes. A block pointer is P = 6 bytes long, and a record pointer is PR = 7 bytes long. A file has r = 30,000 EMPLOYEE records of fixed length. Each record has the following fields: Name (30 bytes), Ssn (9 bytes), Department_code (9 bytes), Address (40 bytes), Phone (10 bytes), Birth_date (8 bytes), Sex (1 byte), Job_code (4 bytes), and Salary (4 bytes, real number). An additional byte is used as a deletion marker. a. Calculate the record size R in bytes. b. Calculate the blocking factor bfr and the number of file blocks b, assuming an unspanned organization. c. Suppose that the file is ordered by the key field Ssn and we want to construct a primary index on Ssn. Calculate (i) the index blocking factor bfr (which is also the index fan-out fo); (ii) the number of block accesses needed to search for and retrieve a record from the file-given its Ssn value-using the primary index. d. Suppose that the file is not ordered by the key field Ssn and we want to construct a secondary index on Ssn. Repeat the previous exercise (part c) for the secondary index and compare with the primary index. e. Suppose that the file is not ordered by the nonkey field Department_code and we want to construct a secondary index on Department_code, Assume there are 1,000 distinct values of Department_code and that the EMPLOYEE records are evenly distributed among these values. Calculate (i) the index blocking factor bfri (ii) the approximate number of block accesses needed to search for and retrieve all records in the file that have a specific Department_code value, using the index. f. Suppose that the file is ordered by the nonkey field Department_code and we want to construct a clustering index on Department_code that uses block anchors (every new value of Department_code starts at the beginning of a new block). Assume there are 1,000 distinct values of Department_code and that the EMPLOYEE records are evenly distributed among these values. Calculate (i) the index blocking factor bfri (ii) the number of block accesses needed to search for and retrieve all records in the file that have a specific Department_code value, using the clustering index (assume that multiple blocks in a cluster are contiguous).
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Transcribed Image Text:Consider a disk with block size B = 512 bytes. A block pointer is P = 6 bytes long, and a record pointer is PR = 7 bytes long. A file has r = 30,000 EMPLOYEE records of fixed length. Each record has the following fields: Name (30 bytes), Ssn (9 bytes), Department_code (9 bytes), Address (40 bytes), Phone (10 bytes), Birth_date (8 bytes), Sex (1 byte), Job_code (4 bytes), and Salary (4 bytes, real number). An additional byte is used as a deletion marker. a. Calculate the record size R in bytes. b. Calculate the blocking factor bfr and the number of file blocks b, assuming an unspanned organization. c. Suppose that the file is ordered by the key field Ssn and we want to construct a primary index on Ssn. Calculate (i) the index blocking factor bfr (which is also the index fan-out fo); (ii) the number of block accesses needed to search for and retrieve a record from the file-given its Ssn value-using the primary index. d. Suppose that the file is not ordered by the key field Ssn and we want to construct a secondary index on Ssn. Repeat the previous exercise (part c) for the secondary index and compare with the primary index. e. Suppose that the file is not ordered by the nonkey field Department_code and we want to construct a secondary index on Department_code, Assume there are 1,000 distinct values of Department_code and that the EMPLOYEE records are evenly distributed among these values. Calculate (i) the index blocking factor bfri (ii) the approximate number of block accesses needed to search for and retrieve all records in the file that have a specific Department_code value, using the index. f. Suppose that the file is ordered by the nonkey field Department_code and we want to construct a clustering index on Department_code that uses block anchors (every new value of Department_code starts at the beginning of a new block). Assume there are 1,000 distinct values of Department_code and that the EMPLOYEE records are evenly distributed among these values. Calculate (i) the index blocking factor bfri (ii) the number of block accesses needed to search for and retrieve all records in the file that have a specific Department_code value, using the clustering index (assume that multiple blocks in a cluster are contiguous).
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