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15. Roles are created in Microsoft SQL Server and Sybase Adaptive Server using a. The sp_create_role stored procedure b. The sp_add_role stored procedure c. The sp_addrole stored procedure d. The CREATE ROLE statement e. The GRANT statement 16. Roles are created in Oracle using a. The sp_create_role stored procedure b. The sp_add_role stored procedure c. The sp_addrole stored procedure d. The CREATE ROLE statement e. The GRANT statement 17. Role privileges are granted to database users in Microsoft SQL Server and Sybase Adaptive Server using a. The sp_create_role_member stored procedure b. The sp_add_role_member stored procedure c. The sp_addrolemember stored procedure d. The CREATE ROLE MEMBER statement e. The GRANT statement 18. Role privileges are granted to database users in Oracle using a. The sp_create_role_member stored procedure b. The sp_add_role_member stored procedure c. The sp_addrolemember stored procedure d. The CREATE ROLE MEMBER statement e. The GRANT statement 19. Write the SQL statement to give users manager_1 and manager_2 privileges to SELECT, INSERT and DELETE rows in the EMPLOYEE table. If you want to test the statement, you will rst have to create the manager_1 and manager_2 users. 20. Write the SQL statement to rescind INSERT, UPDATE, and DELETE privileges for the clerk_127 user from the MOVIE table. If you want to test the statement, you will rst have to create the clerk_127 user.

The type of data phenomena that you might experience during a transaction depends on which isolation level you configure for your transaction. However, before we get into any more specifications about isolation levels, let s take a look at these three types of phenomena. Dirty Reads The first phenomenon that we ll look at is the dirty read. A dirty read can occur when one transaction modifies data, a second transaction sees those modifications before they re actually committed to the database, and the first transaction rolls back the modifications, returning the database to its original state. However, the second transaction, having read the modified data, might have taken action based on the incorrect data. To help illustrate the concept of a dirty read, let s take a look at Figure 16-2, which shows two transactions operating concurrently. When Transaction 1 first begins, it reads the table in its original state. The transaction then updates the table, changing the STOCK value of each row. After those changes are made, Transaction 2 is initiated and reads the updated data. For example, Transaction 2 will see that the STOCK value for the Past Light row is 11. Based on that information, Transaction 2 takes some sort of action, such as ordering additional Past Light CDs. After Transaction 2 has read the table data, Transaction 1, for one reason or another, rolls back the update, and the database is returned to its original state. As a result, the Past Light row actually has a STOCK value of 22, even though Transaction 2 thinks that it has a value of 11. Transaction 2, then, is said to have experienced a dirty read.

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Gordon looked quite happy at the idea, one that he had proposed a few quarters ago when the company hadn t been doing so well From the looks on the other faces, it seemed that others were willing to give the idea a shot That s good, because with Monica s backing, they d have little choice in considering the idea We ll all meet tomorrow morning in this office to discuss the idea If any of you are unable to make it, let me know and send a delegate from your department And, I d like to hear from some cashiers and clerks at the store level, as well Terry, see who s interested in coming And, thanks to all of you for remaining level-headed in this unfortunate time It was a strange situation The company had just had a terrible disaster at one of its busiest stores.

Figure 16-2

In the next chapter, we ll look at how SQL can be incorporated into application programs, such as those written in Java, the Microsoft .NET Framework, C, and other programming languages/environments. However, before we do that, you need to understand the concept of database transactions because you will need them in order to properly implement business processes that update the database.

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