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You can copy files directly between databases over Oracle Net, without using either OS commands or utilities such as the FTP protocol. You can use the DBMS_FILE_TRANSFER package to copy binary files within the same server or to transfer a binary file between servers. You use the COPY_FILE procedure to copy files on the local system, The GET_FILE procedure to copy files from a remote server to the local server and the PUT_FILE procedure to read and copy a local file to a remote file system. Here s a brief explanation of the key procedures of this new package.

Event Source FireEvent()

The COPY_FILE procedure enables you to copy binary files from one location to another on the same or different servers. Before you can copy the files, you must first create the source and destination directory objects, as follows: SQL> CREATE OR REPLACE DIRECTORY source_dir as '/u01/app/oracle/source'; SQL> CREATE OR REPLACE DIRECTORY dest_dir as '/u01/app/oracle/dest'; Once you create your source and destination directories, you can use the COPY_FILE procedure to copy files, as shown here: SQL> BEGIN DBMS_FILE_TRANSFER.COPY_FILE( source_directory_object => 'SOURCE_DIR', source_file_name => 'test01.dbf', destination_directory_object => 'DEST_DIR',

=> 'test01_copy.dbf');

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You use the GET_FILE procedure to copy binary files from a remote server to the local server. First, log into the remote server and create the source directory object, as shown here: SQL> CONNECT system/system_passwd@remote_db Connected. SQL> CREATE OR REPLACE DIRECTORY source_dir as '/u01/app/oracle/source'; Next, you log into the local server and create a destination directory object, as shown here: SQL> CONNECT system/system_passwd@local_db Connected. SQL> CREATE OR REPLACE DIRECTORY dest_dir as /'u01/app/oracle/dest'; Once you create the source and destination directories, ensure that you have a database link between the two databases, or create one if one doesn t exist: SQL> CREATE DATABASE LINK prod1 CONNECT TO system IDENTIFIED BY system_passwd USING 'prod1'; SQL> You must make sure that you ve set up the connection to the prod1 database using a tnsnames.ora file, for example, before you can create the database link. Now you execute the GET_FILE procedure to transfer the file from the remote server to the local server, as shown here: SQL> BEGIN DBMS_FILE_TRANSFER.GET_FILE( source_directory_object source_file_name source_database destination_directory_object destination_file_name END; / SQL>

Event Handler Thread Create() Run Handler()

'SOURCE_DIR', 'test01.dbf', 'remote_db', 'DEST_DIR', 'test01.dbf');

Note that for the SOURCE_DATABASE attribute, you provide the name of the database link to the remote database.

You use the PUT_FILE procedure to transfer a binary file from the local server to a remote server. As in the case of the previous two procedures, you must first create the source and destination directory objects, as shown here (in addition, you must ensure the existence of a database link from the local to the remote database): SQL> CONNECT system/system_passwd@remote_db Connected. SQL> CREATE OR REPLACE DIRECTORY source_dir as '/u01/app/oracle/source';

Figure 8-29. Using an adapter to fire an event asynchronously With the adapter, both the event source and target remain unchanged. Note the asynchronous call between the event source and the adapter. The event source immediately gets control back from the adapter after firing an event. The adapter internally spawns a secondary thread and runs the event target call on it with a synchronous call. If the event target makes calls back to the event source, either directly or indirectly, there may be problems if the event source isn t prepared to handle reentrant calls. While adapters make it possible to fire events without blocking the event source, they can potentially introduce problems related to reentrancy or concurrency, which aren t always easy to troubleshoot.