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External jobs are operating system executables that you run outside the database. You specify EXECUTABLE as the value for the JOB_TYPE parameter for an external job. If you use a named program for an external job, you must specify the complete directory path, for example, /usr/local/bin/perl, where you stored the executable, either in the JOB_ACTION attribute or the PROGRAM_ACTION attribute. You can create local external jobs and remote external jobs. A local external job runs on the same server as the job-originating database, and a remote external job runs on a remote host. You can use remote external jobs to manage jobs across your entire network from a single database. The interesting thing about remote external jobs is that you don t need to have an Oracle database instance running on the remote hosts. You ll just need to install a Scheduler Agent on each of the remote hosts where you wish to run external jobs, to accept job requests from the job-originating database, execute them on the remote host, and transmit the job results to the job-originating database. Running local external jobs is straightforward. All you need to do is to specify EXECUTABLE as the value for the JOB_TYPE or PROGRAM_TYPE arguments. To run remote external jobs, you ll need to install and configure the Scheduler Agent as well as assign credentials for executing the remote jobs. I explain the steps involved in setting up remote external jobs in the following sections.

You must set up the database from where you want to issue external job requests by doing the following:

1. Since you ll need the Oracle XML DB to run a remote external job, first check whether the Oracle XML DB option has been successfully installed in your database by issue the following DESCRIBE command: SQL> desc resource_view Name Null ----------------- ----RES XMLTYPE Type ---------------------------(XMLSchema "http://xm lns.oracle.com/xdb/XDBResour ce.xsd" Element "Resource") VARCHAR2(4000) RAW(16)

Even though the Initializer winds up being logically coupled to all those objects it knows the names or addresses of, it is a simple object because it only provides other objects with the data they need to function Figure 8-1 shows the operation of the Initializer..

The DESCRIBE command shows that the Oracle XML DB option is correctly installed. If the query shows that Oracle XML DB isn t an option, you must install it before you can proceed. 2. Execute the Oracle-provided prvtsch.plb script, located in the $ORACLE_HOME/rdbms/admin directory. SQL> connect sys/sammyy1 as sysdba SQL> @$ORACLE_HOME/rdbms/admin/prvtrsch.plb PL/SQL procedure successfully completed. . . . PL/SQL procedure successfully completed. no rows selected Package created. Package body created. No errors. . . . User altered. SQL> 3. Finally, set a registration password for the Scheduler Agent. SQL> EXEC dbms_scheduler.set_agent_registration_pass( registration_password => 'sammyy1'.expiration_date => systimestamp + interval '7' day,max_uses => 25) PL/SQL procedure successfully completed. SQL> The Scheduler Agent uses the password to register with the database. The EXPIRATION_DATE and the MAX_USES parameters show the date when the password expires and the number of times the password can be used, respectively.

You must install the Scheduler Agent on every remote host where you plan on running external jobs. You can either download the software for installation from Oracle or use the Database CD pack. In either case, you ll need to use the installation media for the Oracle Database Gateway. Here are the steps to install the Scheduler Agent: 1. Log in as the Oracle software owner (usually the user Oracle). 2. Go to where the Oracle Database Gateway installation files are stored and issue the following command to start up the Oracle Universal Installer: $ /oracle11g/gateways/runInstaller 3. On the Welcome screen, click Next. 4. On the Select a Product page, select Oracle Scheduler Agent 11.1.0.6.0, and click Next. 5. On the Specify Home Details page, select a name and provide the directory path for the Oracle Scheduler Agent home. Click Next. 6. On the Oracle Scheduler Agent page, provide the host name and the port number the agent must use to communicate with the external job request originating database. Click Next. 7. On the Summary page, review the selections you made and click Install.

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You can also use a silent install to automate the installation of the Scheduler Agent on a larger number

8. When the installer prompts you to run the root.sh script as the root user, do so and click OK. 9. Click Exit after you see the End of Installation page. You need to use the schagent executable to invoke the Scheduler Agent. But first, you must register the agent with the database from where you want run an external job on the host where you installed the Scheduler Agent. Here s how you register the Scheduler Agent with a database: $ schagent registerdatabase prod1 1522