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The DBA_SCHEDULER_JOBS view displays general information about all Scheduler jobs in the database. The view provides information on jobs, and the PROGRAM_NAME and SCHEDULE_NAME the job belongs to. Here s a typical query using the view: SQL> SELECT job_name, schedule_name, program_name 2* FROM DBA_SCHEDULER_JOBS; JOB_NAME SCHEDULE_NAME PROGRAM_NAME -----------------------------------------------------------------PURGE_LOG DAILY_PURGE_SCHEDULE PURGE_LOG_PROG GATHER_STATS_JOB MAINTENANCE_WINDOW_GROUP GATHER_STATS_PROG SQL> The DBA_SCHEDULER_PROGRAMS view shows information on all the Scheduler programs. Similarly, the DBA_SCHEDULER_SCHEDULES and the DBA_SCHEDULER_WINDOWS views display information about all the Scheduler schedules and windows, respectively.

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The DBA_SCHEDULER_RUNNING_JOBS view gives you details about all running Scheduler jobs in the database. You can use this view to manage currently running jobs.

The DBA_SCHEDULER_JOB_RUN_DETAILS view shows log run details for all Scheduler jobs in the database. You can find the status of your jobs and the duration of their execution using this view. The view has a row for each job instance showing the status and run duration for that job. This view contains a listing of all completed (failed and successful) job runs. If you opt for full logging or the logging runs level of logging, you can use the DBA_ SCHEDULER_JOB_LOG view to examine details of each job operation.

The last two lines in the first section are crucial, as they extract the subject and sender lines from the incoming message and save them in environment variables:

The DBA_DATAPUMP_JOBS view displays all Data Pump jobs. Here s a typical query using this view: SQL> SELECT operation,job_mode,state,degree 2 FROM DBA_DATAPUMP_JOBS; Another important Data Pump view, the DBA_DATAPUMP_SESSIONS view, shows all user sessions that are attached to a Data Pump job.

Therefore, it will not reclaim its memory as long as a tracking handle can be used to access the object Nevertheless, even with this additional protection level, access to a disposed object is unintended A caller expects a called object to be alive To ensure that access to a disposed object is detected, the type System::IO::FileStream (as well as many other disposable reference types) throws an ObjectDisposedException if a method is called on an object that has already been disposed Throwing a well-defined exception when a disposed object is accessed prevents the possibility of undefined behavior For your own classes, you should consider supporting this pattern, too.

The DBA_OBJECTS view contains information about all the objects in the database, including tables, indexes, packages, procedures, functions, dimensions, materialized views, resource plans, types, sequences, synonyms, triggers, views, and table partitions. As you can surmise, this view is useful when you need to know general information regarding any database object. Listing 23-4 shows a query designed to find out the created time and the LAST_DDL_TIME (the last time the object was modified). This type of query helps you identify when a certain object was modified, and is often used for auditing purposes. Listing 23-4. Querying the DBA_OBJECTS View SQL> 2 3 4 5 6 7* SELECT object_name, object_type, created, last_ddl_time, FROM DBA_OBJECTS WHERE owner ='APPOWNER' AND object_name LIKE 'YTD%';

OBJECT_NAME OBJECT_TYPE CREATED LAST_DDL_TIME -------------------------------------------------------------------YTD_ADJ2005050603 TABLE 07/04/2005 07/04/2005 SQL>

A large set of data dictionary views deals with the management of users, profiles, roles, and system and object privileges. In the following sections you ll look at some of the important user management views.

The variables can then be accessed from within the script. The values are pulled out of the message headers using the formail utility, which is a filter designed especially for e-mail. Now we finally come to the body of the rules file.

DBA_USERS is your main user-related view. It contains information about the database user s name, profile, expiration date, default and temporary tablespaces, and the date of creation. Listing 23-5 shows the structure of the DBA_USERS view. Listing 23-5. The DBA_USERS View SQL> DESC DBA_USERS Name Null Type ----------------------------------------- -------- -------------USERNAME NOT NULL VARCHAR2(30)

USER_ID PASSWORD ACCOUNT_STATUS LOCK_DATE EXPIRY_DATE DEFAULT_TABLESPACE TEMPORARY_TABLESPACE CREATED PROFILE INITIAL_RSRC_CONSUMER_GROUP EXTERNAL_NAME SQL>

NOT NULL NUMBER VARCHAR2(30) NOT NULL VARCHAR2(32) DATE DATE NOT NULL VARCHAR2(30) NOT NULL VARCHAR2(30) NOT NULL DATE NOT NULL VARCHAR2(30) VARCHAR2(30) VARCHAR2(4000)