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In data warehousing environments, there are many situations where you need to perform complex ETL jobs You can use SQL transformations to manipulate the data in the external tables before reloading them into the same or other databases Note that when you talk about writing to external tables, you are really referring to writing to an external file You use a SELECT statement to extract table data to this operating system file The ORACLE_DATAPUMP access driver writes data to this file in a binary Oracle-internal Data Pump format, and you can then use this file to load another external table in a different database..

Database backups are used to avoid the loss of data, so it s essential to have a backup system in place. Backups involve keeping copies of the key Oracle database files: data files, the control file, and the archived redo log files. Physical backups involve the copying of database files. You can perform physical backups in two main ways: Use operating system utilities like cp and dd to back up files to perform user-managed backups. You use a combination of operating system backup commands and SQL*Plus commands to back up the database files. Use the Oracle-provided utility, Recovery Manager (RMAN), to perform the backups. RMAN can be used in the command-line mode, as well as through the OEM Database Control interface.

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The example in Listing 13-5 shows how you can create an external table and populate it with data from an external flat file using the ORACLE_DATAPUMP access driver rather than the ORACLE_LOADER driver. Listing 13-5. Creating an External Table with the ORACLE_DATAPUMP Access Driver SQL> CREATE TABLE test_xt( 2 product_id NUMBER(6), 3 warehouse_id NUMBER(3), 4 quantity_on_hand NUMBER(8)) 5 ORGANIZATION EXTERNAL( 6 TYPE ORACLE_DATAPUMP 7 DEFAULT DIRECTORY ext_data_dir 8 LOCATION ('test_xt.dmp')); Table created. SQL> To load data from this external table into an existing database table, you can use the INSERT INTO . . . SELECT clause, as shown earlier in Listing 13-4.

RMAN can do everything that user-managed backups can, and it provides several additional capabilities. You also don t need to keep track of the backed-up data files and archived redo log files with RMAN, since RMAN itself manages all that information. In this chapter, I introduce you to using RMAN though the command line, so you understand the concepts behind it. Once you gain proficiency in using the tool, feel free to use the Database Control interface to manage RMAN-based backups. Although I ll focus on using RMAN in this chapter, I briefly discuss user-managed backups toward the end of the chapter. Although disk storage prices keep dropping, tape storage is still the cheaper way to store large amounts of data offsite. If you re using RMAN, you need a third-party media manager to make a backup to a tape device. Before you start dealing with the mechanics of backups, you need to understand certain terms associated with backups.

The example in Listing 13-6 shows how to write to an external table. Listing 13-6. Populating an External Table SQL> CREATE TABLE test_xt ORGANIZATION EXTERNAL( TYPE ORACLE_DATAPUMP DEFAULT DIRECTORY ext_data_dir LOCATION ('test_xt.dmp')) AS SELECT * FROM scott.dept; Note how the external table creation statement uses the SELECT * FROM clause to write data from the scott.dept table to the external table (file). If your new external table contains some but not all of the columns of the table scott.dept, you use the appropriate SELECT statement instead of the SELECT * FROM statement.

Current redo log files are often referred to as online redo logs to distinguish them from the older saved or archived redo log files.

A clear understanding of the types of backups and backup concepts is extremely important for a successful recovery. Here, I ll review some terminology related to Oracle database backups.

Redo log files consist of redo records, which are groups of change vectors, each referring to a specific change made to a data block in the Oracle database A single transaction may involve multiple changes to data blocks, so it may have more than one redo record Initially, the contents of the log are kept in the redo log buffer (a memory area), but they are transferred to disk very quickly If your database comes down without warning, the redo log can help you determine whether all transactions were committed before the crash or if some were still incomplete Oracle redo log files contain the following information about database changes made by transactions: Indicators specifying when the transaction started The name of the transaction The name of the data object that was being updated (eg.

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