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When the last row is deleted from a data page, the entire page is deallocated by the ghost cleanup background thread. The exception is if the table is a heap, as we discussed earlier. (If the page is the only one remaining in the table, it isn t deallocated. A table always contains at least one page, even if it s empty.) Deallocation of a data page results in the deletion of the row in the index page that pointed to the deallocated data page. Non-leaf index pages are deallocated if an index row is deleted (which, again, for an update might occur as part of a DELETE/INSERT strategy), leaving only one entry in the index page. That entry is moved to its neighboring page if there is space, and then the empty page is deallocated. The discussion so far has focused on the page manipulation necessary for deleting a single row. If multiple rows are deleted in a single DELETE operation, you must be aware of some other issues. Because the issues of modifying multiple rows in a single query are the same for INSERTs, UPDATEs, and DELETEs, we discuss this issue in its own section, later in this chapter.

SQL Server updates rows in multiple ways, automatically and invisibly choosing the fastest update strategy for the speci c operation. In determining the strategy, SQL Server evaluates the number of rows affected, how the rows are accessed (via a scan or an index retrieval, and via which index), and whether changes to the index keys occur. Updates can happen either in place, by just changing one column s value to a new value in the original row, or as a DELETE followed by an INSERT. In addition, updates can be managed by the query processor or by the storage engine. In this section, we examine only whether the update happens in place or whether SQL Server treats it as two separate operations: delete the old row and insert a new row. The question of whether the update is controlled by the query processor or the storage engine is actually relevant to all data modi cation operations (not just updates), so we look at that in a separate section.

6

class The basic building block of object-oriented programming; it defines the fields, properties, methods, and events of an object compiler A computer program that translates the instructions written in one computer language into output in another computer language; compilers translate source code into some type of machine language that can be executed by a computer console application An application that is run from a command prompt with no Windows or Web interface context-sensitive menu A menu that provides different choices to the user depending on when it is accessed controls Components of a graphical user interface, such as text boxes or buttons

What happens if a table row has to move to a new location In SQL Server 2008, this can happen because a row with variable-length columns is updated to a new, larger size so that it no longer ts on the original page It can also happen when the clustered or nonclustered index column(s) change because rows are logically ordered by the index key For example, if we have a clustered index on lastname, a row with a lastname value of Abbot is stored near the beginning of the table If the lastname value is then updated to Zappa, this row has to move to near the end of the table Earlier in this chapter, we looked at the structure of indexes and saw that the leaf level of nonclustered indexes contains a row locator, or bookmark, for every single row in the table.

Companies and industry leaders are collaborating to develop standardized DTDs to share information and to automate business processes For example, if Ford, GM, and DaimlerChrysler agree on a standard B2B e-commerce DTD with a set of rules for their procurement needs, then they could ensure that their partners, vendors, and customers could write compatible applications The interoperability that XML promises will become a reality as more and more companies develop industry-specific DTDs The focus across vertical industries such as electronics has been to define specific DTDs so businesses can exchange data Business-to-business e-com-