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Here s how you create a restore point: SQL> CREATE RESTORE POINT test; Restore point created. SQL> You can drop a restore point by using this command: SQL> DROP RESTORE POINT test; Restore point dropped. SQL>

It is that easy. Just supply the format in the control file and SQLLDR will convert the date for us. In some cases, it might be appropriate to use a more powerful SQL function. For example, your input file might contain dates in many different formats: sometimes with the time component, sometimes without; sometimes in DD-MON-YYYY format; sometimes in DD/MM/YYYY format; and so on. You ll learn in the next section how to use functions in SQLLDR to overcome these challenges.

Note For complete details on the procedures available in the DBMS_LOB package and their full set of inputs and outputs, please refer to the Oracle9i Oracle Supplied Packages Guide and the Oracle 10g Oracle PL/SQL Packages and Types Reference.

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The restore point I created in the previous example is known as an ordinary restore point. An ordinary restore point merely provides you a convenient way of specifying a prior SCN or a point in time during a Flashback or recovery operation. However, an ordinary restore point doesn t guarantee that the database will retain the Flashback Database logs necessary for a Flashback Database operation to succeed under all circumstances. However, you can also create a guaranteed restore point, which guarantees that you can revert your database to the SCN or time specified by the restore point. All you need is enough room in the flash recovery area to store the logs necessary to enforce the guaranteed restore point. Ordinarily, before undertaking a major operation in the database, you might ensure that you have a backup, just in case you have to revert to the original version of the database if something goes wrong. A guaranteed restore point makes performing a backup unnecessary. With a guaranteed restore point, you are always guaranteed that you can flash back your database to that prior time. Guaranteed restore points don t depend on the Flashback logs. Thus, you can create a guaranteed restore point even if Flashback logging is turned off. Guaranteed restore points use a logging mechanism that s somewhat similar to the Flashback logs, but it s separate from them. If you use a guaranteed restore point, Oracle won t delete any Flashback logs that are created after you create the guaranteed restore point. Therefore, you can end up filling up your flash recovery area and causing the database to stop its operations if Flashback logging is enabled when you re using guaranteed restore points. You re better off turning off Flashback logging if you re using guaranteed restore points.

In this section, you ll see how to refer to functions while loading data. Bear in mind, however, that the use of such functions (including database sequences) requires the SQL engine, and hence won t work in a direct path load. Using functions in SQLLDR is very easy once you understand how SQLLDR builds its INSERT statement. To have a function applied to a field in a SQLLDR script, simply add it to the control file in

Tip Guaranteed restore points use a separate logging mechanism from the Flashback logging used for a Flashback Database operation. You can use guaranteed restore points with or without Flashback logging enabled you must, however, configure a flash recovery area.

To use these procedures, we will need to create a DIRECTORY object in the database. This object will allow us to create BFILES (and open them) that point to a file existing on the file system that the database server has access to. This last phrase, that the database server has access to, is a key point when using PL/SQL to load LOBs. The DBMS_LOB package executes entirely in the server. It can see only the file systems the server can see. It cannot, in particular, see your local file system if you are accessing Oracle over the network. So we need to begin by creating a DIRECTORY object in the database. This is a straightforward process. We will create two directories for this example (note that these examples are executed in a UNIX environment; you will use the syntax for referring to directories that is appropriate for your operating system): ops$tkyte@ORA10G> create or replace directory dir1 Directory created. as '/tmp/';

You create a guaranteed restore point the same way as an ordinary restore point, just adding the GUARANTEE FLASHBACK clause to it, as shown here: SQL> CREATE RESTORE POINT test_guarantee GUARANTEE FLASHBACK DATABASE; Restore point created. SQL>

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