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Perform the network import from the database named remote, using the following Data Pump Import command: [local] $ impdp system/sammyy1 SCHEMAS=scott NETWORK_LINK=remote Listing 14-9 shows the output of the Data Pump job specification in this example, using the NETWORK_LINK parameter Listing 14-9 Using the NETWORK_LINK Parameter in Data Pump Import Import: Release 111060 - Production on Tuesday, 25 March, 2008 12:00:32 Copyright (c) 2003, 2007, Oracle All rights reserved..

Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.0.0 - Beta With the Partitioning, OLAP and Data Mining options FLASHBACK automatically enabled to preserve database integrity. Starting "SYSTEM"."SYS_IMPORT_SCHEMA_01": system/******** schemas=SCOTT NETWORK_LINK=remote Estimate in progress using BLOCKS method . . . Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA Total estimation using BLOCKS method: 32 KB Processing object type SCHEMA_EXPORT/USER

Processing object type SCHEMA_EXPORT/SYSTEM_GRANT Processing object type SCHEMA_EXPORT/ROLE_GRANT Processing object type SCHEMA_EXPORT/DEFAULT_ROLE Processing object type SCHEMA_EXPORT/TABLESPACE_QUOTA Processing object type SCHEMA_EXPORT/TABLE/TABLE . . imported "SCOTT"."TEST" 96 rows Job "SYSTEM"."SYS_IMPORT_SCHEMA_01" successfully completed at 06:59 [local] $

Subscriptions have a life cycle: They can be created, administered, and canceled. A subscription policy identifies who has the right to change subscriptions and how subscriptions behave over a given period of time. For example, a policy might issue subscriptions that are valid per a specific lease period, after which they expire. Such subscriptions could be useful when sending messages to users by e-mail. If a person never responds, the system could assume the person is not interested in the messages or has closed the e-mail account. In such cases, the person s subscription would expire at some point. The expiration policy might be based on criteria other than time, such as the total number of messages sent to a subscriber or the number of responses the subscriber sent. Other aspects defined in a policy are related to the following: Can subscriptions be changed Can subscriptions be canceled How many different subscriptions can a subscriber have When a subscription is changed or canceled, a certain amount of latency can exist between the time the change request is sent and the time the event publisher receives and processes it. During this time, which is often variable and related to system load, the publisher might send notifications that the subscriber is no longer interested in. The subscription policy should address this issue as well.

The FLASHBACK_TIME parameter enables you to import data consistent as of the flashback time you specify in your import job. Oracle finds the SCN closest to the time you specify, and enables the Flashback utility using this SCN. For example, look at the following import statement: $ impdp system/manager FLASHBACK_TIME="TO_TIMESTAMP('01-06-2005 07:00:00;', 'DD-MM-YYYY HH24:MI:SS')" Note that the FLASHBACK_TIME parameter does the same thing as the old CONSISTENT parameter in the traditional import utility. The FLASHBACK_SCN parameter is similar to the FLASHBACK_TIME parameter, except that you directly specify the SCN. Whether you use the FLASHBACK_TIME or the FLASHBACK_SCN parameter, it is the SCN that plays the key role in determining the flashback time with which your imported data will be consistent.

All the interactive export parameters shown in Table 14-1 are valid for interactive import as well, with one exception: the ADD_FILE command is valid only for Data Pump Export jobs. As with Data Pump Export jobs, when you use the Ctrl+C sequence, the import job will pause, and you ll see the import> prompt, enabling you to enter any of the interactive import commands from there.

Two new views DBA_DATA PUMP_JOBS and DBA_DATA PUMP_SESSIONS are crucial for monitoring Data Pump jobs. In addition, you can use the V$SESSION_LONGOPS view and the old standby V$SESSION to obtain session information. In most cases, you can join two or more of these views to gain the necessary information about job progress. Let s look at some of the important data dictionary views that help you manage Data Pump jobs.

Summary

The DBA_DATAPUMP_JOBS view shows summary information of all currently running Data Pump jobs. Here s an example: SQL> SELECT * FROM dba_datapump_jobs; OWNER_NAME JOB_NAME OPERATION JOB_MODE ----------- ---------- -------- -------SYSTEM SYS_EXPORT EXPORT FULL _FULL_01 SQL> STATE DEGREE --------- -----EXECUTING 1 ATTACHED_SESSIONS -------- ---------1