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In the example, the database host is named prod1, and the port number assigned to the Scheduler Agent is 1522. Once you issue this command, you ll be prompted to supply the agent registration password you created earlier: $./schagent -registerdatabase localhost.localdomain 1522 Agent Registration Password ****** $ You start the Scheduler Agent by issuing the following command: $./schagent start Scheduler agent started $ Stop the agent by issuing the following command: $./schagent stop Scheduler agent stopped $

SendMessage()

The preceding examples show how to work with the Scheduler Agent on a UNIX/Linux system. You must install the OracleSchedulerExecutionAgent service before you can use the agent. You can install the service in the following way: $ schagent installagentservice The OracleSchedulerExecutionAgent service is different from the Oracle service that you use to start and stop an Oracle instance on a Windows server.

Since an external job must execute as an operating system user s job, the Scheduler lets you assign operating system credentials to an external job. You use a credential, which is a schema object that contains a username and password combination, to designate the credentials for an external job. Use the CREDENTIAL_NAME attribute when you create an external job to specify the credentials for executing that job. You aren t required to specify credentials for a local external job, although Oracle recommends that you do so. Before you can create a remote external job, you must first create a credential. You can then assign that credential object to the user under whose account the remote external executable will be run. Note that a user must have the execute privilege on a credential object before the user can use that credential to execute a job. Here are the steps you must follow to create a remote external job: 1. First, execute the CREATE_CREDENTIAL procedure to create a credential object. SQL> exec dbms_scheduler.create_credential('hrcredential, 'hr','sammyy1'); 2. Grant privileges on the newly created credential to the user who ll need to use the credential. SQL> grant execute on system.hrcrdential to sam; You can query the DBA_SCHEDULER_VIEW to examine all credentials in the database. 3. Create a remote external job by executing the CREATE_JOB procedure. SQL> 2 3 4 5 6 7 8* SQL> begin dbms_scheduler.create_job( job_name => 'remove_logs', job_type => 'executable', job_action => '/u01/app/oracle/logs/removelogs', repeat_interval => 'freq=daily; byhour=23', enabled => false); end; /

PL/SQL procedure successfully completed. SQL> 4. Once you create the remote external job REMOVE_LOGS, set the CREDENTIAL_NAME attribute of the remote job by executing the SET_ATTRIBUTE procedure. SQL> exec dbms_scheduler.set_attribute('remove_logs', 'credential_name','hrcredential'); PL/SQL procedure successfully completed. SQL>

Figure 8-1. Using an Initializer to initialize names of external systems at run time An even better approach is to remove directory lookup and message-sending code entirely from objects that need to send messages. But without that code, how would an object send its messages By using event notifications! When an object needs to send a message, it fires an event whose payload contains two things: 1. The name of the recipient 2. The message to send The recipient s name is obtained from a property initialized with the correct values at run time by an Initializer object, as shown in Figure 8-2.

5. Execute the SET_ATTRIBUTE procedure again, this time to set the DESTINATION attribute. SQL> exec dbms_scheduler.set_attribute('remove_logs', 'destination', 'localhost.localdomain:1521'); PL/SQL procedure successfully completed. SQL> 6. Execute the ENABLE procedure to enable the external job. SQL> exec dbms_scheduler.enable('remove_logs'); PL/SQL procedure successfully completed. SQL> You can disable the capability to run external jobs in a database by dropping the user remote_ scheduler_agent, who is created by the prvtsch.plb script that you ran earlier. SQL> drop user remote_scheduler_agent cascade; You must reexecute the prvtrch.plb script for the database to run a remote external job, once you drop the remote_scheduler_agent.

A program contains metadata about what the Scheduler will run, including the name and type of the program, and what a job will execute. Different jobs can share a single program.

Set Recipient Name()