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WrittenHW2 - CS245 Database System Principles Summer 2009...

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CS245 Database System Principles Summer 2009 Written Assignment 2 Due on Wednesday August 12, 09 State all assumptions. Email questions to [email protected] Problem 1 (20 points) Consider the following schema, for an online bookstore: Cust (CustID, Name, Address, State, Zip) Book (BookID, Title, Author, Price, Category) Order (OrderID, CustID, BookID, ShipDate) This schema represents customers (Cust) and books (Book). When a customer buys a book, a tuple is entered into the Order table. Assume you have an index over Book.Author, but there are no other indexes. Indicate the number of I/Os required to perform the following operations. You should assume that each operation uses memory efficiently. You can ignore final output I/O cost. If required, explain briefly. Use the following statistics: B(Order) = 3,000 blocks B(Cust) = 1,000 blocks B(Book) = 100 blocks a) Selection of Price<10 over Book. Memory = 10 blocks. b) One pass join of Order and Cust. Memory =1001 blocks.
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