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If you are short any of the resources mentioned earlier, chances are good that you ll need to get more help. Fortunately, there are many organizations that specialize in providing this type of help. For example, if you need assistance in developing best practices for implementing your data protection plan, you can hire a consultant to evaluate your current environment and make recommendations. Or, if you just need people to handle the day-to-day operations of maintaining backup media, you can hire contractors. Earlier, we also mentioned the availability of Internet backups. These organizations are now responsible for all of the tedious work managing media, scalability, and uptime. When used properly, outsourcing can help a business focus on what it does best and leave other jobs to the experts. However, in the short term, outsourcing fees might seem very high. Nevertheless, with third parties as ever-present options, not having enough time is not a good excuse for not protecting information. In such a case, more time and personnel resources may be required, or the standards and requirements for data protection must be lowered (and documented).

FETCH overdue_rentals;

You state that data can be passed from the variable to the SQL statement if the data types are compatible. How do you pass data if they re not compatible Most programming languages contain at least some data types that do not match up with SQL data types. If this situation arises, you can use the CAST value expression within the SQL statement to convert the variable value into a value that can be used by the SQL statement. In effect, the CAST value expression changes the data type of the value. For example, we can modify the previous embedded statement to convert the v_CD_ID host variable, as shown in the following example:

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It is important to have an organized cataloging system for specifying the information stored on tapes. Be sure to keep log files regarding backup failures or any files that are not backed up. Cataloging and organizing backup media may seem fairly simple at first, but there are many reasons to come up with a good system initially. First, if only a date is used on backup tapes, you may be unsure whether the media contains full backups or only incremental backups. Also, to perform a restoration, you ll need to find all necessary tapes. If a set of tape numbers is used, the contents must be described in detail elsewhere. Here is an example of a tape-labeling scheme:

EXEC SQL SELECT CD_NAME, IN_STOCK FROM CD_INVENTORY WHERE CD_ID = CAST(:v_CD_ID AS INT);

SQL provides a convenient way to update data selected with a cursor or to delete rows from tables referenced by a cursor fetch. Keep in mind that no SQL statement can update or delete data in more than one table, so a cursor that contains a join has some update and delete restrictions. And as noted earlier, many SQL implementations require the FOR UPDATE clause for cursors that are to be used for updates and/or deletes. A special form of UPDATE and DELETE statement is used when a cursor is involved. It contains the WHERE CURRENT OF clause that names the cursor. The row that is updated or deleted is the last one fetched by the named cursor. If no row was successfully fetched from the cursor, any statement containing WHERE CURRENT OF will fail. Here is the general syntax of the cursor UPDATE statement, followed by Oracle and Microsoft SQL Server examples:

As you can see, CAST is used to convert the value in the host variable to an INTEGER data type. (For more information about CAST, see 10.) To determine which data types in a host language are compatible with data types in SQL, you should refer to the SQL:2006 standard, language-specific documentation, or product-specific documentation.

A good cataloging system will do the following: w s Allow for tapes to be reused (if this is in accordance with the backup policy). Specify whether tapes will be stored offsite.

17:

As you have seen throughout this book, the process of querying data in an SQL database involves executing a SELECT statement that in turn retrieves data from the applicable table or tables and returns that data in a result set A result set can be made up of one or more rows and one or more columns When you are querying data interactively, the multiple rows present no problems because your client application can handle more than one row However, when querying data from an embedded SQL statement, multiple rows have to be handled through a cursor in order to allow that host language to work with one row at a time A cursor, as you ll recall, acts as a pointer to specific rows in the result set.

2:

UPDATE table_name SET column_and_value_list WHERE CURRENT OF cursor_name; UPDATE MOVIE_RENTAL SET DUE_DATE = CURRENT_DATE WHERE CURRENT OF overdue_rentals; UPDATE MOVIE_RENTAL SET DUE_DATE = getdate() WHERE CURRENT OF overdue_rentals;

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