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You can now use the MERGE statement with an optional DELETE clause. However, you can t use the DELETE clause independently in a MERGE statement, as with the UPDATE or INSERT clause. You must embed the DELETE statement inside the UPDATE statement. This means that the DELETE statement isn t a global clause, but rather works in the confines of the data affected by the UPDATE clause of the MERGE statement. Listing 13-10 shows how the DELETE clause is embedded within the UPDATE clause. Listing 13-10. Using the DELETE Clause in a MERGE Statement SQL> MERGE INTO products p USING product_changes s ON (p.prod_id = s.prod_id) WHEN MATCHED THEN UPDATE SET p.prod_list_price = s.prod_new_price, p.prod_status = s.prod_new_status DELETE WHERE (p.prod_status = 'OLD_ITEM') WHEN NOT MATCHED THEN INSERT (prod_id, prod_list_price, prod_status) VALUES (s.prod_id, s.prod_new_price, s.prod_new_status); This MERGE statement will first update the prod_list_price and the prod_status columns of the products table wherever the join condition is true. The join condition (p.prod_id = s.prod_id) joins the two tables: product (the source table) and product_changes (the destination table). Here are a couple of considerations when using the DELETE statement: The DELETE clause affects only the rows that were updated by the MERGE statement. The MERGE statement will delete only the rows included in the join condition specified by the ON clause. In the example, when you use this MERGE statement, the UPDATE clause fires first, and it may set some of the prod_new_status values to expired. The DELETE clause will then remove all the rows whose prod_new_status value was set to expired by the UPDATE clause. The DELETE clause will not remove any other rows with the expired status, unless they are part of the join defined in the ON clause.

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You can always reconfigure each of these files in case you lose them, but this wastes a lot of critical time and you could end up making mistakes in the process These auxiliary files take very little space to store, and you may sometimes need these other files to restore and recover a damaged database Keep the use of the UNRECOVERABLE and NO LOGGING options to a minimum, for obvious reasons If there s a problem, you won t have those objects in the redo logs, and you won t be able to recover them..

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Suppose you need to insert data from the source table into several target tables. Additionally, you want this loading to be based on various conditions: if condition A, then load into table X; if condition B, then load into table Y; and so on. Normally, you re forced to write several INSERT statements for inserting from the source into the target tables. If the data were very large, this would slow down the data loading. Alternatively, you could write PL/SQL-based code to do the same thing, but that would also slow down the process. A type of SQL statement called a multitable insert enables you to do fast conditional loads of data from one source into multiple tables simultaneously. Because it s still a normal SQL statement, you can parallelize the operation to make the operation even faster. Multitable inserts can be either unconditional or conditional. You can also have a multitable insert that is a mix of conditional and

Use the RMAN tool, which is provided free of cost from Oracle, to perform your backups and recovery. RMAN maintains a log of all the backup and recovery actions performed, so it s easy to keep track of those operations. Keep older copies of backups for added protection. It s not a good idea to overwrite your tapes too soon to save a little money. If the current backups turn out to be unusable for some reason (which is a real possibility), you end up losing all of your data. Always know how many archived backups you have and where they are, and safeguard them. Your backup scripts should write to a log file or a log table, which should be examined for any problems that might have occurred during the backups. Ensure that your applications are separated into independent tablespaces, so you needn t take more than one application offline if you have a major media problem. Consider using snapshot technology-based storage system backup techniques for fast backups of large databases. Use the Data Pump Export utility (discussed in 14) to provide supplemental protection.

unconditional inserts. The structure of the multitable insert varies depending on whether all or only some of the source table s rows are being loaded into the target tables.

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