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Event subscription is the process of linking an event publisher to an event subscriber. When a subscriber subscribes to an event, it essentially signs up to receive future notifications from the publisher. Event publishers are usually capable of detecting several types of events and sending different types of notifications. During the subscription process, the subscriber must identify the type of event it is interested in. The publisher stores the subscriber s subscription. Any time an event is detected, the publisher sends a notification to the subscriber of the event. A publisher exposes the list of events it can detect. It exposes the list by publishing the events, which usually means that the events are made visible through interfaces, properties, or methods of some type. Publishers must be prepared to deal with the situation in which an event has no subscribers. Publishers must therefore possess a certain amount of intelligence to check for the existence of subscribers before trying to send notifications.

You can also perform Data Pump Export and Import operations easily through the OEM Database Control interface. To use this feature, start the Database Control, select Maintenance, and then choose Utilities. On the Utilities page, you can see the various choices for exporting and importing data.

As in the case of the regular export utilities, you can perform Data Pump Export jobs in several modes: Full export mode: You use the FULL parameter when you want to export the entire database in one export session. You need the EXPORT_FULL_DATABASE role to use this mode. Schema mode: If you want to export a single user s data and/or objects only, you must use the SCHEMAS parameter. Tablespace mode: By using the TABLESPACES parameter, you can export all the tables in one or more tablespaces. If you use the TRANSPORT_TABLESPACES parameter, you can export just the metadata of the objects contained in one or more tablespaces. You may recall that you can export tablespaces between databases by first exporting the metadata, copying the files of the tablespace to the target server, and then importing the metadata into the target database. Table mode: By using the TABLES parameter, you can export one or more tables. The TABLES parameter is identical to the TABLES parameter in the old export utility. Schema mode is the default mode for Data Pump Export and Import jobs. If you log in as follows, for example, Data Pump will automatically perform a full export of all of SYSTEM s objects: $ expdp system/sammyy1 If you are the SYSTEM user, you can export another schema s objects by explicitly using the SCHEMAS parameter, as shown in Listing 14-3.

Listing 14-3. A Data Pump Export Using the Schema Mode $ expdp system/sammyy1 DUMPFILE=scott.dmp SCHEMAS=SCOTT Export: Release 11.1.0.6.0 - Production on Tuesday, 25 March, 2008 12:19:31 Copyright (c) 2003, 2007, Oracle. All rights reserved.

22. Events and Delegates, http://msdn.microsoft.com/library/default.asp url=/library/en-us/cpguide/html/ cpconeventsdelegates.asp, 2004. 23. What are events , online help documentation for Borland Delphi 5, 1997.

Connected to: Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 Production With the Partitioning, OLAP, Data Mining and Real Application Testing options FLASHBACK automatically enabled to preserve database integrity. Master table "SCOTT"."SYS_SQL_FILE_SCHEMA_01" successfully loaded/unloaded Starting "SYSTEM"."SYS_EXPORT_SCHEMA_01": system/******** dumpfile=scott.dmp schemas=SCOTT total estimation using BLOCKS method: 192 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/PRE_SCHEMA/PROCACT_SCHEMA Processing object type SCHEMA_EXPORT/TABLE/TABLE Processing object type SCHEMA_EXPORT/TABLE/INDEX/INDEX Processing object type SCHEMA_EXPORT/TABLE/CONSTRAINT/CONSTRAINT Processing object type SCHEMA_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS Processing object type SCHEMA_EXPORT/CONSTRAINT/REF_CONSTRAINT Processing object type SCHEMA_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS . . exported "SCOTT"."DEPT" . . exported "SCOTT"."EMP" . . exported "SCOTT"."SALGRADE" . . exported "SCOTT"."BONUS" Dump file set for SYSTEM.SYS_EXPORT_SCHEMA_01 is: /u01/app/oracle/product/10.2.0/db_1/admin/orcl/dpdump/scott.dmp Job "SYSTEM"."SYS-EXPORT_SCHEMA_01" successfully completed AT 18:25:16

Some of the Data Pump Export utility parameters will be familiar to you from the traditional export utility. Others are quite new. Here, I ll briefly run through the parameters, providing detailed explanations for the most important parameters. For this discussion, I ve grouped the parameters into the following categories: File- and directory-related parameters Export mode-related parameters Export filtering parameters Encryption-related parameters Estimation parameters The network link parameter Interactive mode export parameters Job-related parameters Note that you can use all the export parameters at the command line or in parameter files, except for those listed in the Interactive Mode Export Parameters (Commands) section.

You can specify several file- and directory-related parameters during a Data Pump Export job. These include the DIRECTORY, DUMPFILE, FILESIZE, PARFILE, LOGFILE, NOLOGFILE, and COMPRESSION parameters.