Suppose you are given the James River Jewelry database design as follows:
CUSTOMER ( , LastName, FirstName, Phone, Email)
PURCHASE ( , Date, PreTaxAmount, CustomerID)
PURCHASE_ITEM ( , ItemNumber, RetailPrice)
ITEM ( , Description, Cost, ArtistName)
OWNER ( , Name, Phone, Email, AmountOwed)
JEWELRY_ITEM ( I , DateReceived, DateSold, NegotiatedSalesPrice, ActualSalesPrice, CommissionPercentage, OwnerID)
CustomerID in PURCHASE must exist in CustomerID in CUSTOMER
InvoiceNumber in PURCHASE_ITEM must exist in InvoiceNumber in PURCHASE
ItemNumber in PURCHASE_ITEM must exist in ItemNumber in ITEM
OwnerID in JEWELRY_ITEM must exist in OwnerID in OWNER
ItemNumber in JEWELRY_ITEM must exist in ItemNumber in ITEM
The OWNER and JEWELRY_ITEM tables are used to record data and maintain owner data about jewelry accepted on consignment. JEWELRY_ITEM (which is a subtype of ITEM-n ote the referential integrity constraint) is used to record the negotiated sales price, the commission percentage, and the actual sales price for each item of consigned jewelry.
Assume that office personnel at James River Jewelry use a database application to record consignment data.
Suppose James River Jewelry identifies three groups of users: managers, administrative personnel, and system administrators. Suppose further that managers and administrative personnel can perform Acceptance Transactions and Sales Transactions, but only managers can perform Price Adjustment Transactions.
James River Jewelry has developed the following procedure for backup and recovery. The company backs up the database from the server to a second computer on its network each night. Once a month, it copies the database to a CD and stores it at a manager’s house. It keeps paper records of all services provided for an entire year. If it ever loses its database, it plans to restore it from a backup and reprocess all service requests.
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