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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 called row LCRs, and those containing information about DDL changes are called DDL LCRs. Rules used by the capture process determine which changes it captures. 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.

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Toub writes, An OutOfMemoryException is thrown during an attempt to procure more memory for a process when there is not enough contiguous memory available to satisfy the demand Calling a method that references a type for the first time will result in the relevant assembly being delay-loaded into memory, thus requiring allocations Executing a previously unexecuted method requires that method to be just-in-time (JIT) compiled, requiring memory allocations to store the generated code and associated runtime data structures According to Brian Grunkemeyer, on the BCL Team Blog (http://blogsmsdncom/ bclteam/archive/2005/06/14/429181aspx), CERs are eagerly prepared, meaning that when we see one, we will eagerly JIT any code found in its statically-discoverable call graph This means that an OutOfMemoryException caused by JIT compilation may be thrown before the CER is entered.

Following are the steps you must take in order to configure and administer the Oracle Streams feature to propagate changes between multiple databases. 1. Make the necessary changes to your init.ora or SPFILE, 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 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 components of the SGA. If you are running one or more capture processes, set UNDO_RETENTION to at least 3600. Make sure the undo tablespace is large enough to accommodate the UNDO_RETENTION setting. Make sure your source database is in the 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; Now create the Streams administrator user in the database, as follows: SQL> CREATE USER strmadmin IDENTIFIED BY strmadmin DEFAULT TABLESPACE streams_tbs TEMPORARY TABLESPACE temp QUOTA UNLIMITED ON streams_tbs; 3. Grant the CONNECT, RESOURCE, and DBA roles to the Streams administrator: SQL> GRANT CONNECT, RESOURCE, DBA TO strmadmin;