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the marshaling process will realize that the callee changed its obj pointer, so the caller and callee will no longer reference the same object. The marshaling process will then leave the caller s object intact. In order for the changes made to the obj pointer to be propagated back to the caller, the C# keyword ref is required in the call: callee.DoSomething(ref obj); In OMG IDL, this kind of call uses an [in, out] modifier on the obj argument. If the callee doesn t make any changes to its version of the obj pointer, the marshaling process will act the same way as before. If the pointer is changed to point to a new object in the callee s address space, when Callee.DoSomething returns, the marshaling process will create a new object in the caller s space, initialize it with the callee s deserialized object, and then adjust the caller s pointer to reference this new object. Let s look at a C# example. Say you have an object of class A that needs to send a notification to a subscriber of class B, located in a different process space. The notification uses PC delivery, and the event handler has the following signature: void GetEmployeeInfo(Employee theEmployee); The signature is simple, not involving explicit use of pointers. Under the covers, you know that pointers are present, because objects are always passed by reference in C#, as well as in most other OO languages. Let the Employee class contain just two fields, as shown in Figure 4-12.

Flashing back a database is possible only when there is no media failure. If you lose a datafile or it becomes corrupted, you ll have to recover using a restored datafile from backups.

You can use Flashback Database in the following situations: To retrieve a dropped schema When a user error affects the entire database When you truncate a table in error When a batch job performs only partial changes The Flashback Database feature uses flashback database logs, which are stored in the new flash recovery area, to undo changes to a point in time just before a specified target time or SCN. Since the specified target time and the actual recovery time may differ slightly, you then use archived redo logs to recover the database over the short period of time between the target time and the actual recovery time. Once the Flashback Database feature is enabled, you simply use the FLASHBACK DATABASE command to return the database to its state at a previous time, SCN, or log sequence. You can issue the FLASHBACK DATABASE command from either RMAN or SQL*Plus. The only difference is that RMAN will automatically retrieve the necessary archived redo logs, whereas in SQL*Plus you may have to supply the archived redo logs, unless you use the SET AUTORECOVERY ON feature in SQL*Plus. We ll take a look at the whole Flashback Database process in more detail shortly, but first let s look at how to enable (and disable) the Flashback Database feature.

Figure 4-12. A simple class containing a scalar field and a class field Don t worry about the methods defined in Employee. Marshaling involves the transfer of an object s data, never its methods. Listing 4-1 shows a simple implementation of an event source that sends an object in the notification payload. Listing 4-1. A C# Event Source That Uses an Object in the Notification Payload public class A { public void ProcessEmployee(Employee theEmployee) { FireGetEmployeeInfo(theEmployee); } public delegate void GetEmployeeInfoHandler(Employee theEmployee); public event GetEmployeeInfoHandler OnGetEmployeeInfo; public void FireGetEmployeeInfo(Employee theEmployee) { if (OnGetEmployeeInfo != null) OnGetEmployeeInfo(theEmployee); } } Class A uses a delegate called OnGetEmployeeInfo to fire events when it needs information about an employee. C# delegates are simply pointers to methods. Let s assume that OnGetEmployeeInfo is initialized at run time to point to the method GetEmployeeInfo in class B, shown in Listing 4-2.

Since you need the current datafiles in order to apply changes to them, you can t use the Flashback Database feature in cases where a datafile has been damaged or lost.

In order to configure the Flashback Database feature, you need to step through a series of operations, as follows: 1. Check that your database is in the archivelog mode by either querying the V$DATABASE view or simply issuing the following command: SQL> ARCHIVE LOG LIST Database log mode Automatic archival Archive destination Oldest online log sequence Next log sequence to archive Current log sequence SQL> Archive Mode Enabled /u01/app/oracle/admin/finance/arch/finance 42035 42039 42039

The preceding output reveals that the database is indeed running in the archivelog mode. If it isn t, you can turn archive logging on with the ALTER DATABASE statement shown in the following code, after first shutting down the database and starting it up initially in the mount mode: SQL> SQL> SQL> SQL> SHUTDOWN IMMEDIATE; STARTUP MOUNT; ALTER DATABASE ARCHIVELOG; ALTER DATABASE OPEN