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In earlier chapters, we talked about ways to protect data through redundancy For example, RAID technology and multiple power supplies can prevent common failures When implementing redundant hardware, it s important to keep in mind which failures you will be protected against If downtime is not an option, then you might want to choose a clustering solution This will protect against hardware failures of the servers themselves, but if the machines are located on the same network, a router failure may cause both servers to be unavailable Of course, you can protect against this by providing multiple routes to the servers, but it takes additional planning Even with that level of protection, a physical disaster will cause downtime Keep spares To the extent your business requirements and budget permit, you will probably want to keep spare hardware available.

The first type of subquery that we ll look at is the type used within the IN predicate. As you might recall from 9, the IN predicate compares values from a column in the primary table to values returned by the subquery. If the column value is in the subquery results, that row (from the primary table) is returned in the query results of the SELECT statement. For example, suppose you want to query data from the CD_STOCK table, shown in Figure 12-1.

CD_ARTISTS TITLE: VARCHAR(60) Famous Blue Raincoat Blue Court and Spark Past Light Kojiki That Christmas Feeling Patsy Cline: 12 Greatest Hits ARTIST_NAME: VARCHAR(60) Jennifer Warnes Joni Mitchell Joni Mitchell William Ackerman Kitaro Bing Crosby Patsy Cline

SELECT MOVIE_TITLE, RETAIL_PRICE_DVD FROM MOVIE WHERE RETAIL_PRICE_DVD BETWEEN 19.99 AND 29.99;

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Although redundancy can protect against many problems, some problems might require an entire server replacement If, for example, a motherboard component fails, you can simply remove the hard disks from the failed machine and place them in another one Be sure that the hardware is exactly the same, since differences as minor as network card revisions can require driver changes Enter into a maintenance contract Most major manufacturers of hardware provide a service or maintenance contract In the event of a failure, parts replacements can be made under the contract Based on the level of support provided, this might involve a technician visiting onsite to repair failed machines or the shipping of a replacement part It is important to fully understand the terms of a service-level agreement when it comes to support and maintenance contracts.

After the Rain: The Soft Sounds of Erik Satie Pascal Roge Out of Africa Leonard Cohen The Best of Fundamental Blues on the Bayou Orlando John Barry Leonard Cohen Bonnie Raitt B.B. King David Motion

Figure 12-1

There are few things worse than finding out that 24-hour support only applies on weekdays or that parts are not guaranteed to be in stock..

SELECT MOVIE_TITLE, MOVIE_GENRE_CODE, MPAA_RATING_CODE FROM MOVIE WHERE (MOVIE_GENRE_CODE = 'Comdy' AND MPAA_RATING_CODE = 'PG-13') OR (MOVIE_GENRE_CODE = 'Drama' AND MPAA_RATING_CODE = 'R');

Your query results should include only those rows whose CD_TITLE value matches one of the values returned by the subquery. The subquery results should include only those rows that contain an ARTIST_NAME value of Joni Mitchell (from the CD_ARTISTS table). The following SELECT statement will return this data:

By implementing these best practices, you can ensure that when hardware failures occur, you ll be able to deal with them appropriately.

SELECT * FROM CD_STOCK WHERE CD_TITLE IN ( SELECT TITLE FROM CD_ARTISTS WHERE ARTIST_NAME = 'Joni Mitchell' );

Let s take a closer look at the subquery in this statement. As you can see, it is included in the IN predicate, after the IN keyword. The subquery is basically a SELECT statement that includes a search condition defined in the WHERE clause:

SELECT COUNT(*) FROM MOVIE_RENTAL WHERE LATE_OR_LOSS_FEE IS NULL;

7:

SELECT TITLE FROM CD_ARTISTS WHERE ARTIST_NAME = 'Joni Mitchell'

If you were to execute only the subquery, you would receive the following query results:

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