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The central concept behind performing backups is to move information into less expensive, removable forms of storage. Economy and efficiency are the objectives behind this idea. Backup hardware comes in many shapes and forms. Traditionally, when systems administrators heard the phrase backup and recovery, they thought tape drives. Tape-based media has many advantages and can meet business requirements. Several years ago, when hard drives were relatively expensive, tape backup units offered large storage capacities and good performance. Of course, there are tradeoffs: Tape media usually is not randomly accessible. Thus, if you need to access a piece of data in the middle of a tape, you may spend a large percentage of your time simply finding the data. Consequently, running applications or accessing data files regularly from tape is prohibitively slow.

c. COMMIT d. ROLLBACK e. SAVEPOINT 17. The amount of data held by a lock (lock granularity) can be a a. Database b. Table c. Row d. Column e. Block or page 18. The concurrent update problem a. Is a consequence of simultaneous data sharing b. Cannot occur when AUTOCOMMIT is set to ON c. Is the reason that transaction locking must be supported d. Occurs when two database users submit con icting SELECT statements e. Occurs when two database users make con icting updates to the same data 19. A lock a. Is a control placed on data to reserve it so that the user may update it b. Is usually released when a COMMIT or ROLLBACK takes place c. Has a timeout set in DB2 and some other RDBMS products d. May cause contention when other users attempt to update locked data e. May have levels and an escalation protocol in some RDBMS products 20. A deadlock a. Is a lock that has timed out and is therefore no longer needed b. Occurs when two database users each request a lock on data that is locked by the other c. Can theoretically put two or more users in an endless lock wait state d. May be resolved by deadlock detection on some RDBMSs e. May be resolved by lock timeouts on some RDBMSs

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9. What type of constraint can you specify in a SET CONSTRAINTS statement 10. Which isolation level fully isolates one transaction from another transaction 11. You re using a SET TRANSACTION statement to configure transaction modes. You want

to ensure that no nonrepeatable reads and no dirty reads can occur within that transaction. However, you re not concerned about phantom reads. Which isolation level should you use

So far, we ve looked at several different methods of performing backups. Chances are good that more than one will apply to your environment. For example, developers workstations that contain large amounts of information might need to be backed up using local backup solutions, whereas a server farm would be a better scenario for a centralized solution. In many cases, the pros and cons of the potential solutions will make the decision obvious. In other cases, however, the scenario you choose will be based on time, administration, and technical constraints. With this in mind, let s move on to look at an overview of the technology available for accomplishing these tasks.

A READ UNCOMMITTED B READ COMMITTED C REPEATABLE READ D SERIALIZABLE 12. You re setting up a transaction that defers the application of the CK_CD_STOCK constraint

In this chapter, we ll have a look at how SQL is used in applications. An application is a set of computer programs designed to solve a particular business problem, such as an order-entry system, a payroll-processing system, or an accounting system. Applications can be built using a general-purpose procedural programming language such as Java, C, or C++, or a programming environment such as the Microsoft .NET Framework. A procedural programming language speci es an explicit sequence of steps to follow in order to complete a transaction. In applications that use relational databases, the application developers use various techniques for communicating with the database, which of course includes sending SQL statements to the database for processing and dealing with the results. This chapter explores some of those techniques.

Nowadays, hard disk space is cheap, and buying an additional drive can often provide the level of data redundancy needed as an adequate (though very cumbersome) solution for client machines The large amounts of data normally stored on the server side, however, still requires tape devices (which have evolved incredibly in the last few years) These days, it s likely that more than one solution will fit an organization s data protection needs The challenge has been reduced to making the best choice, instead of trying to find just anything that meets the goals The details of the solutions will be based on the business s constraints and on technology So, how can we choose the best hardware solution for backups We ll cover the specifics of various hardware solutions in 5.

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