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Directory objects are named objects that Data Pump maps to a specific operating system directory. For example, a directory object named dpump_dir1 can point to the /u01/app/oracle/admin/ export directory on the server. You can then access this directory by simply using the dpump_dir1 directory object name. Oracle creates a default directory object, DATA_PUMP_DIR, when you create a new database or if you upgrade a database to that version. This default DATA_PUMP_DIR directory object points to a directory named dpdump. The default Data Pump directory is automatically created by Oracle in one of the following locations: ORACLE_BASE/admin/SID ORACLE_HOME/admin/SID If you have defined the ORACLE_BASE directory, Oracle uses the location based on it. Otherwise, Oracle will create the default directory under the ORACLE_HOME directory. Data Pump will write all dump files, SQL files, and log files to the directory specified for the default DATA_PUMP_DIR object. To see exactly where your default DATA_PUMP_DIR directory object is located, you can use the following query, based on the DBA_DIRECTORIES view: SQL> SELECT * FROM dba_directories; OWNER DIRECTORY_NAME DIRECTORY_PATH -----------------------------------------------------------------------------SYS DATA_PUMP_DIR /u01/app/oracle/product/10.2.0/db_1/admin/orcl/dpdump/ SQL> Only privileged users like SYS and SYSTEM can use the default directory object DATA_PUMP_DIR. Thus, user SYSTEM can start a Data Pump Export job without providing a directory name. Listing 14-1 shows the output of the Data Pump Export job. Listing 14-1. A Data Pump Export Run by the User SYSTEM C:\>expdp system/sammyy1 Export: Release 11.1.0.6.0 - Production on Saturday, 22 March, 2008 11:10:36 Copyright (c) 2003, 2007, Oracle. All rights reserved.

DCOM was an attempt to scale the Component Object Model (COM) architecture to distributed systems, but has since been replaced by the NET Framework The NET Framework is an ambitious enterprise by Microsoft to create a cross-language run-time environment for local and distributed systems The NET Framework is a component-based technology that overcomes many of the limitations of Microsoft s COM and DCOM architectures, which developers consider too complicated The NET Framework includes support for events, remote procedure calls, and messaging services Another significant component model is Sun s JavaBeans Initially a model for local systems, it was extended into an environment, known as Java 2 Platform, Enterprise Edition (J2EE), to support distributed systems J2EE includes support for transactions as well as message queuing through the Java Message Service (JMS) API.

Connected to: Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Produc tion With the Partitioning, OLAP, Data Mining and Real Application Testing options FLASHBACK automatically enabled to preserve database integrity. Starting "SYSTEM"."SYS_EXPORT_SCHEMA_01": system/******** Estimate in progress using BLOCKS method . . . Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA Total estimation using BLOCKS method: 320 KB Processing object type SCHEMA_EXPORT/USER . . . Processing object type SCHEMA_EXPORT/POST_SCHEMA/PROCACT_SCHEMA . . exported "SYSTEM"."REPCAT$_AUDIT_ATTRIBUTE" 6.398 KB 2 rows . . . . . exported "SYSTEM"."SQLPLUS_PRODUCT_PROFILE" 0 KB 0 rows Master table "SYSTEM"."SYS_EXPORT_SCHEMA_01" successfully loaded/unloaded ****************************************************************************** Dump file set for SYSTEM.SYS_EXPORT_SCHEMA_01 is: C:\ORCL\APP\ORACLE\ADMIN\ORCL\DPDUMP\EXPDAT.DMP Job "SYSTEM"."SYS_EXPORT_SCHEMA_01" successfully completed at 11:11:52 C:\>

However, before a nonprivileged user can use Data Pump Export or Import, the DBA must create a directory object or grant privileges to use an existing directory In addition to the DBA, any user with the CREATE ANY DIRECTORY privilege can create a directory object Here s how you create a directory object: SQL> CREATE DIRECTORY dpump_dir1 AS '/u01/finance/oradata/dump_dir'; In order for a user to use a specific directory, the user must have access privileges to the directory object For example, in order to let the database read and write files on behalf of user salapati in the new directory object dpump_dir1, you need to grant the following privileges: SQL> GRANT READ, WRITE ON DIRECTORY dpump_dir1 TO salapati Grant succeeded.

SQL> This command will permit the Oracle database to read and write files in the dpump_dir1 directory object on behalf of the user, but won t give the user any direct privileges on that directory You ll need the write privilege on all files for a Data Pump Export job During an import, you ll need read access to the export dump file You ll also need write privileges on the directory for an import job, so that you can write to the log file Here s what happens when you are given the read/write privileges on a directory object: You can read/write files mapped to that directory object only through Oracle The Oracle database must have privileges to read/write files in that directory.