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Use this as a guideline to determine the longevity and reliability of your solution Shelf life of media The media used in removable storage drives has a finite lifespan That is, tapes and other forms of media will eventually degrade to the point where data recovery is no longer possible Although this might not be an issue for weekly backups, it s important when organizations attempt to store archived information for years Generally, backup media is expected to last decades This is usually long enough for allowing systems administrators to find another solution such as transferring all historical information to newer backup devices with larger capacities and more reliable media..

Invoke SQL Directly Embed SQL Statements in Your Program Create SQL Client Modules Use an SQL Call-Level Interface

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hroughout this book, you have been performing Try This exercises and testing examples by using a client application to work interactively with your SQL database. For example, you might have been using SQL Server Management Studio to access a SQL Server database, SQL*Plus or iSQL*Plus to access an Oracle database, or perhaps the MySQL Command Line Client to access a MySQL database. This method of data access is referred to as direct invocation, or interactive SQL. The SQL:2006 standard also provides for the use of other types of data access, including embedded SQL, SQL client modules, and the call-level interface (CLI); however, the types of data access supported by an SQL implementation often vary from product to product. Some, for example, do not support embedded SQL, and few support SQL client modules. In this chapter, I introduce you to the four types of data access methods and explain how they can be used to retrieve and modify data in your SQL database. Because SQL and CLI are the two methods most commonly used by programs to access SQL data, I cover these two topics in greater detail than direct invocation and SQL client modules, although I do provide a foundation in all four access types.

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DECLARE cursor_name CURSOR FOR select_statement [FOR UPDATE [OF column_name [, column_name...]]]

If you ve gotten this far in the book, you should already be very comfortable with interactive SQL. By using your client application, which comes with most database management products, you ve been able to create ad hoc SQL statements that return immediate results to the application. These results are normally displayed in a window separate from where you executed your SQL statement. For example, let s take a look at Figure 17-1, which shows SQL Server Management Studio. Notice that the top window includes a SELECT statement and the bottom window includes the query results from executing that statement. Most direct invocation client applications behave in a manner similar to this. The types of SQL statements supported by the direct invocation method can vary from one SQL implementation to the next. Although most implementations will allow you to execute basic types of statements, such as SELECT or UPDATE, they might not allow you to execute statements specific to another method of data access. For example, some implementations might not allow you to declare a cursor within an interactive environment. Despite the differences among SQL implementations, the SQL standard does define which types of statements should be supported in an interactive environment. These include SELECT,

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Restoring data is much easier than re-creating it. Statistics show that over 80 percent of businesses that experience significant data loss never reopen their doors. Why is this a potentially disastrous event We already gave examples of why information is important. Anyone who has ever had to re-create information knows how difficult a task it is. I cringe at the thought of losing my grocery list. Imagine losing a day s worth of sales information from 20 stores! In some cases, the data can t be re-created, while in other cases, it can. In either situation, however, the process takes time and a lot of patience. The time itself is costly, because we all have more productive tasks to do than to redo something we have already completed. The difficulty and cost associated with re-creating information should provide strong motivation for protecting it.

Figure 17-1

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