DATABASE SYSTEM CONCEPTS (LOOSELEAF)
7th Edition
ISBN: 9781260515046
Author: SILBERSCHATZ
Publisher: MCG
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Chapter 21, Problem 1PE
Explanation of Solution
Benefits property:
If the query range contains only few tuples, then each query is executed quickly on a single disk. This allows the parallel execution of queries and leads to the reduced overhead on multiple disks.
Drawbacks:
If the query range has many tuples, every query required long time to execute as there is no parallelism within its execution. Some disks become hot-spots and thus increases the response time.
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Draw a level-0 diagram for this scenario: You are developing a new customer relationship management system for the BEC store, which rents out movies to customers. Customers will provide comments on new products, and request rental extensions and new products, each of which will be stored into the system and used by the manager for purchasing movies, extra copies, etc. Each month, one employee of BEC will select their favorite movie pick of that week, which will be stored in the system. The actual inventory information will be stored in the Entertainment Tracker system, and would be retrieved by this new system as and when necessary.
Chapter 21 Solutions
DATABASE SYSTEM CONCEPTS (LOOSELEAF)
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