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Although LPCs and RPCs are semantically equivalent, they are quite different in terms of implementation and operation. While LPCs are supported directly by languages and microprocessors, RPCs aren t and must rely on a calling substrate that handles the plumbing. Although the RPC details are usually hidden from the application code layer, you should at least keep them in mind. The fundamental tasks of the RPC plumbing are To provide location transparency of remote calls To deal with the communication channel To provide a receiver-side daemon to accept incoming calls To marshal input parameters into the receiver s process space To marshal output parameters back to the sender s process space The RPC substrate handles most of these tasks transparently, but one thing is important: Communication channels are not always reliable, so the sender may need to include exception handling for communication failures or timeouts. All the various distributed component models use their own RPC implementation. For example, CORBA components use OMG RPC, JavaBeans components use Java RMI, and .NET components use .NET Remoting. The substrates are different at both the application interface and wire levels, so it isn t possible to use a .NET component to invoke a CORBA component using .NET Remoting, or to use a CORBA component to invoke a .NET component using OMG RPC. Although the RPCs are incompatible, it is possible to build bridging components, which allow cross-platform calls.

The DBA_SCHEDULER_SCHEDULES view provides information on all current schedules in your database, as shown here: SQL> SELECT schedule_name, repeat_interval 2* FROM dba_scheduler_schedules; SCHEDULE_NAME --------------------DAILY_PURGE_SCHEDULE SQL> REPEAT_INTERVAL -----------------------------------------freq=daily;byhour=12;byminute=0;bysecond=0

The DBA_SCHEDULER_JOB_LOG view enables you to audit job-management activities in your database. The data that this view contains depends on how you set the logging parameters for your jobs and job classes. In the Creating a Job Class section, earlier in the chapter, you saw how to set the logging level for a job at the job class level. In order to set the logging levels at the individual job level, you use the

Event targets are the recipients of event notifications. A target is said to be untyped (from the perspective of an event source) if the source knows nothing about the interface of the target. When dealing with untyped targets, event sources send notifications directly to a method of the target, bypassing the target s interfaces. To do so, the event source must have a direct reference to the method, as shown in Figure 8-4.

SET_ATTRIBUTE procedure of the DBMS_SCHEDULER package. In the SET_ATTRIBUTE procedure, you can set the LOGGING_LEVEL attribute to two different values: DBMS_SCHEDULER.LOGGING_FULL DBMS_SCHEDULER.LOGGING_RUNS The DBMS_SCHEDULER.LOGGING_RUNS option will merely record the job runs, while the DBMS_ SCHEDULER.LOGGING_FULL option turns on full job logging. Here is an example showing how you can turn on full job logging at the job level: SQL> EXECUTE dbms_scheduler.set_attribute ('TESTJOB', 'LOGGING_LEVEL', dbms_scheduler.LOGGING_FULL);

By default, once a day, the Scheduler will purge all window logs and job logs that are older than 30 days. You can also manually purge the logs by executing the PURGE_LOG procedure, as shown here: SQL> EXECUTE DBMS_SCHEDULER.PURGE_LOG( LOG_HISTORY => 1, JOB_NAME => 'TEST_JOB1');

By default, all Oracle Database 11.1 databases use the Scheduler to run the following jobs, though you can, of course, disable any of these jobs if you wish: SQL> SELECT owner, job_name, job_type FROM dba_scheduler_jobs; OWNER -----------------------------SYS SYS SYS SYS SYS SYS SYS SYS ORACLE_OCM ORACLE_OCM EXFSYS EXFSYS 12 rows selected. SQL> The Scheduler is a welcome addition to the Oracle DBA s arsenal of tools. By providing a sophisticated means of scheduling complex jobs, it does away with the need for third-party tools or complex shell scripts to schedule jobs within the database. JOB_NAME -----------------------------ADV_SQLACCESS1821051 XMLDB_NFS_CLEANUP_JOB FGR$AUTOPURGE_JOB BSLN_MAINTAIN_STATS_JOB DRA_REEVALUATE_OPEN_FAILURES HM_CREATE_OFFLINE_DICTIONARY ORA$AUTOTASK_CLEAN PURGE_LOG MGMT_STATS_CONFIG_JOB MGMT_CONFIG_JOB RLM$SCHDNEGACTION RLM$EVTCLEANUP JOB_TYPE ---------------PLSQL_BLOCK STORED_PROCEDURE PLSQL_BLOCK STORED_PROCEDURE STORED_PROCEDURE

In Figure 8-4, MethodReference alludes to a platform-specific method reference type. The reference is initialized at run time to point to a method with a compatible signature, introducing signature coupling between the event source object and the event target object. The source and target are coupled at the object level, but are decoupled at the class level. At compile time, the source doesn t know what class the method referenced will belong to, which means the event source is entirely independent of the type of objects that might be chosen as targets. Any object that exposes methods with the required signature can be used as an event target.

Automated maintenance tasks are jobs that run automatically in the database to perform maintenance operations. Following are the automated maintenance tasks in Oracle Database 11g:

Automatic Optimizer Statistics Collection Automatic Segment Advisor Automatic SQL Tuning Advisor All three automated maintenance tasks run during the default system maintenance window on a nightly basis. I discuss predefined maintenance windows next.

-MethodReference myReference +MyMethod()