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until you execute several SQL statements. After you execute the statements, you want to explicitly apply the constraint to the changes you made to the database. What SQL statement should you use to apply the constraints

14. You want to create a savepoint named svpt_Section2. What SQL statement should you use 15. You create a transaction that includes four savepoints: Section1, Section2, Section3, and

For now, know that the following issues will affect your data protection plan: w Backup capacity When shopping for backup hardware devices, you ll probably first look at the capacities of a potential solution If you have about 20GB to back up, a very convenient choice will be a solution that can record this much information on a single piece of media That way, you won t be stuck in the server room on a Friday evening, waiting to change tapes Backup hardware vendors often use the assumption that your data will compress to half its normal size (a 2:1 ratio) This might occur for some types of data, but you should use better estimates We ll look at some recommendations in later chapters For now, keep in mind that a major factor in your decision will be how much data can be stored on a single piece of media.

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Procedural programming languages are designed to handle one record at a time (one object instance or collection at a time in the case of object-oriented languages such as Java). This presents a dilemma when SQL is used in conjunction with the programming language because SQL queries typically produce result sets that contain multiple records (rows) of data. There is a mismatch that must be addressed. To overcome the mismatch, most relational databases support the concept of a cursor, which is merely a pointer to a single row in the result set. In Oracle, cursor support is included in a procedural language SQL extension called PL/SQL (Procedural Language/SQL) and similarly is included in Transact-SQL in Sybase Adaptive Server and Microsoft SQL Server. These procedural SQL extensions are discussed later in this chapter. The use of a cursor parallels the use of a traditional at le in that the cursor must be de ned and opened before it may be used, it may be read from by fetching rows in a programming loop, and it should be closed when the program no longer needs it.

Section4. Near the end of the transaction, after all four savepoints, you define a RELEASE SAVEPOINT that specifies the Section2 savepoint. Which savepoint or savepoints are removed from the transaction when the RELEASE SAVEPOINT statement is executed

A Section1 B Section2 C Section3 D Section4 16. What circumstances will terminate a transaction 17. You re creating a ROLLBACK statement in your transaction. You want the rollback to undo

Backup speed Removable media drives can only transfer data up to a maximum rate Factors that affect performance include the data transfer bus (such as SCSI buses) and the physical characteristics of the drive and the media Depending on the volume of data to be backed up and the amount of time available for doing it, backup speed will play a role in finding the right solution Hardware reliability The investment you make in backup hardware can be significant tape and other removable media solutions are not cheap! Almost all physical devices (especially those with moving parts) will fail at some point It s important to consider how long the solution you have selected will last Having tape devices fail can be quite costly, since you will need to immediately obtain a replacement and backups may be skipped Vendors often cite statistics based on mean time between failures (MTBF).

terminated, you want a new transaction to be initiated. The new transaction should be configured with the same transaction modes as the first transaction. How should you create your COMMIT statement

A cursor must be declared before it can be referenced by any other SQL statements. Here is the general syntax of the DECLARE CURSOR statement that de nes a cursor:

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