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table If you back up the log during the update and then after it, the rst log backup has the beginning of the transaction and some of the updates, and the second log backup has the remainder of the updates and the commit Suppose that you then need to restore these log backups after restoring the full database If you run recovery after restoring the rst log backup, the rst part of the transaction is rolled back If you then try to restore the second log backup, it starts in the middle of a transaction, and SQL Server won t have information about what the beginning of the transaction was You certainly can t recover transactions from this point because their operations might depend on this update that you ve partially lost SQL Server, therefore, does not allow any more restoring to be done.

FIGURE 11 Some of the basic tools that support XML include XSL, XLink, XSLT, XPointer, DTDs, schemas, DOM, and SAX Each of these technologies is described in more detail in later chapters

The alternative is not to run recovery to roll back the rst part of the transaction and instead to leave the transaction incomplete SQL Server takes into account that the database is inconsistent and does not allow any users into the database until you nally run recovery on it What if you want to combine the two approaches It would be nice to be able to restore one log backup and look at the data before restoring more log backups, particularly if you re trying to do a point-in-time recovery, but you won t know what the right point is SQL Server provides an option called STANDBY that allows you to recover the database and still restore more log backups.

If you restore a log backup and specify WITH STANDBY = <some lename> , SQL Server rolls back incomplete transactions but keeps track of the rolled-back work in the speci ed le, which is known as a standby le The next restore operation reads the contents of the standby le and redoes the operations that were rolled back, and then it restores the next log If that restore also speci es WITH STANDBY, incomplete transactions again are rolled back, but a record of those rolled-back transactions is saved Keep in mind that you can t modify any data if you ve restored WITH STANDBY (SQL Server generates an error message if you try), but you can read the data and continue to restore more logs The nal log must be restored WITH RECOVERY (and no standby le is kept) to make the database fully usable..

The tooltip control is helpful for displaying information about a control when a user holds the mouse pointer over the control.

Summary

In addition to one or more data les, every database in a SQL Server instance has one or more log les that keep track of changes to that database. (Remember that database snapshots do not have log les because no changes are ever made directly to a snapshot.) SQL Server uses the transaction log to guarantee consistency of your data, at both a logical and a physical level. In addition, an administrator can make backups of the transaction log to make restoring a database more ef cient. An administrator or database owner can also set a database s recovery mode to determine the level of detail stored in the transaction log.

SQL Server 2008 introduces a new type of update operation called MERGE. MERGE is a hybrid of the other update operations and can be used to perform conditional changes to a table. The business value of this operation is that it can collapse multiple T-SQL operations into a single query. This simpli es the code that you have to write to modify tables, improves performance, and really helps operations against large tables that could be so large as to make multistep operations effectively too slow to be useful. Now that you have seen how the other update operations are handled, you might have gured out that MERGE is actually not a dif cult extension of the action column techniques used in the other operations. Like the other queries, the source data is scanned, ltered, and modi ed. However, in the case of MERGE, the set of rows to be changed is then joined with the target source to determine what should be done with each row. Based on this join, the action column for each row is modi ed to tell the STREAM UPDATE operation what to do with each row. In Listing 8-15, an existing table is going to be updated with new data, some of which might already exist in the table. Therefore, MERGE is used to determine only the set of rows that are missing. Figure 8-57 contains the resulting MERGE query plan.