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A reader server, which reads redo logs and divides them into regions One or more prepare servers, which scan the regions in parallel and perform prefiltering of changes A builder server, which merges redo records it receives from the prepare servers and hands them to the capture process The capture process formats the merged redo records into a logical change record (LCR) and enqueues them into the staging area for further processing. An LCR describes changes made to a single row with a DML statement. A single DML statement can produce several LCRs. An LCR, which is a set of captured changes, is also called an event. LCRs containing information about table data are known as row LCRs, and those containing information about DDL changes are called DDL LCRs. Rules used by the capture process determine which changes it captures. Note that you can set up Streams such that the database can extract changes from the redo stream at the source and then transmit the LCRs to the target or transmit the entire redo stream the target. The target can then extract the LCRs. In the staging element, the Oracle Streams process stores events in a queue. These events could include both explicit and implicit changes. In the final stage, consumption, the queued events are consumed in the target database. An event is consumed when you dequeue it from an event queue. Users and applications can dequeue events explicitly. However, most of the dequeueing is through an implicit apply process. The dequeueing and processing of the captured data is done according to rules. The apply process may apply the captured data directly or transform it using PL/SQL code.

Following are the steps you must take in order to configure and administer the Oracle Streams feature to propagate changes between multiple databases. Note that this is a very brief overview of the Streams configuration process designed to give you a flavor of the process. You must refer to the appropriate guidelines in the Oracle manuals for setting up Streams in your environment. 1. Make the necessary changes to your init.ora or SPFILE file to make sure the following are true: The COMPATIBLE parameter should be set to 10.2.0 or higher in both databases (you can actually set it to 9.2 or higher). The JOB_QUEUE_PROCESSES parameter on the source database should be at least 2. The GLOBAL_NAMES parameter should be set to true in both the source and target databases. Set LOG_ARCHIVE_DEST_n. You must have at least one log archive destination at the site running the downstream capture process. Make sure you allocate at least 200MB to the STREAMS_POOL_SIZE memory component of the SGA. Ensure that the undo tablespace is large enough to accommodate the UNDO_RETENTION setting. Make sure your source database is in archivelog mode. 2. Create a new user to manage the streams. Before you create the user, you may want to create a new tablespace for the use of this new Streams user. SQL> CREATE TABLESPACE streams_tbs DATAFILE '/u01/app/oracle/oradata/ streams_tbs.dbf' SIZE 100M;

stores a reference to the event handler in a variable. As mentioned earlier, .NET languages such as C# and VB .NET use a new built-in type called a delegate to hold the references to event handlers. These delegates can store references to multiple event handlers. Object Pascal uses a simple pointer that can only reference one event handler at a time. In .NET languages and Object Pascal, the sender calls the event handler without using a class or interface reference. Receivers are not required to implement any specific interface; therefore, receivers are called untyped. In contrast, in the JavaBeans event model, event listeners are typed. To receive a certain type of event, a listener must implement a specific interface. The sender uses a reference to this interface to call one of the methods of the receiver. When notification delivery is based on typed receivers, type coupling is introduced between the sender and the receiver. The sender not only identifies the interface of the callee, but it also chooses which method of that interface to call. Both decisions must be made at compile time, but the identity of the object called isn t determined until run time, when the sender s reference-to-interface is initialized.