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Create a database link to the remote database, which is named remote in this example: SQL> CREATE DATABASE LINK remote 2 CONNECT TO scott IDENTIFIED BY tiger 3 USING 'remoteworld'; 2 If there isn t one already, create a Data Pump directory object: SQL> CREATE DIRECTORY remote_dir1 AS '/u01/app/oracle/dp_dir'; 3 Set the new directory as your default directory, by exporting the directory value: $ export DATA_PUMP_DIR=remote_dir1 4 Perform the network export from the database named remote: $ expdp system/sammyy1 SCHEMAS=SCOTT FILE_NAME=networkdmp NETWORK_LINK=finance You ll see that the Data Pump Export job will create the dump file networkdmp (in the directory location specified by remote_dir1) on the server hosting the database named local However, the data within the dump file is extracted from the user scott s schema in the remote database (named remote in our example).

You can see that the NETWORK_LINK parameter carries the dump files over the network from a remote location to the local server All you need is a database link from a database on the local server to the source database on the remote server..

You can t use Data Pump in the normal way to export data from a read-only database. This is because Data Pump can t create the necessary master table or create external tables on a read-only tablespace. Using the network mode, however, you can export data from a read-only database on server A to dump files on server B, where Data Pump is running.

Figure 2-10. Channels carrying one type of notification The event-to-channel mapping, also called channelization, can also be related to notification content. The need for channelization arises often when notifications contain textual information. For example, a news service might expose different channels for international news, local news, weather news, and so on, as shown in Figure 2-11.

If your export data dump file includes encrypted column data columns, you can use the new ENCRYPTION_ PASSWORD parameter to supply a password, to prevent the writing of the encrypted column data as clear text in the dump file set. When you import a dump file that was created using an encryption password this way, you ll need to supply the password. Here s an example of using the ENCRYPTION_ PASSWORD parameter: $ expdp hr/hr TABLES=employees DUMPFILE=test.dmp ENCRYPTION_PASSWORD=123456

Several of the Data Pump Export parameters can be classified as job-related parameters. I ll briefly discuss the important ones here.

The JOB_NAME parameter is purely optional. You can use this parameter to give an explicit name to the export job, instead of letting Oracle assign a default name. Remember that Oracle gives the master table, which holds critical information about your export job, the same name as the name of the job.

Figure 2-11. Channels associated with content types The news service would need to extract information from incoming newswire stories and determine which channel to assign the story to. There can be a substantial amount of processing involved in determining which channel a notification belongs to. Large systems often use a separate system to handle the job, splitting the job of event detection and channelization, as shown Figure 2-12.

The STATUS parameter is useful while you re running long jobs, as it provides you with an updated status at intervals that you can specify. The parameter takes integer values that stand for seconds. The default is 0 and will show new status when it s available. If you want to reassure yourself with minute-by-minute updates concerning a Data Pump job you re currently running, use the STATUS parameter, as shown in Listing 14-5. Listing 14-5. Using the STATUS Parameter $ expdp system/manager STATUS=60 . . . . . . Worker 1 Status: State: EXECUTING ..Object Schema: SYSTEM ..Object Name: SYS_EXPORT_SCHEMA_01 Object Type: SCHEMA_EXPORT/TABLE/TABLE_DATA Completed Objects: 1 Total Objects: 65 . . exported "SYSTEM"."REPCAT$_SITES_NEW" Job: SYS_EXPORT_SCHEMA_01 Operation: EXPORT Mode: SCHEMA State: EXECUTING Bytes Processed: 69,312 Percent Done: 99 Current Parallelism: 1 Job Error Count: 0 Dump File: C:\ORACLE\PRODUCT\11.1.0\ADMIN\EXPORT\EXPDAT6.DMP bytes written: 1,748,992 . . . The STATUS parameter shows the overall percentage of the job that is completed, the status of the worker processes, and the status of the current data objects being processed. Note that the Data Pump log file will show the completion status of the job, whereas the STATUS parameter gives you the status of an ongoing Data Pump job.

The FLASHBACK_SCN parameter specifies the system change number (SCN) that Data Pump Export will use to enable the Flashback utility. If you specify this parameter, the export will be consistent as of this SCN. The following example shows how you can export the user HR s schema up to the SCN 150222: $ expdp hr/hr DIRECTORY=dpump_dir1 DUMPFILE=hr_exp.dmp FLASHBACK_SCN=150222