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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.

In the next example, I m trying to enter the SQL statement, SELECT 200 - 100 FROM dual: SQL> SELECT 200 > 100 from dual; 100 from dual * ERROR at line 1: ORA-00923: FROM keyword not found where expected SQL> In the preceding example, when I started the second line after the hyphen (-), which is also the minus sign, SQL*Plus automatically interpreted it as the continuation character and issued an error because the statement was syntactically incorrect (select 200 100 from dual) You can avoid this problem by using a second hyphen (minus sign) at the end of the first line as a continuation character.

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.

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SQL> SELECT 200 - > 100 FROM dual; 200-100 ---------100 SQL> The dual table is necessary in Oracle so as to enable certain queries, since in Oracle s SQL, you must use the FROM clause in a SELECT statement (for example, SELECT sysdate FROM dual;) Microsoft SQL Server database, on the other hand, doesn t use a dual table because you can have a SELECT statement without a FROM clause in SQL Server select 200.

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 previous code will disable the automatic SQL tuning tasks in all maintenance windows, since I didn t specify a value for the WINDOW_NAME parameter.

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.

By setting the TEST_EXECUTE parameter when you execute the SET_TUNING_TASK_PARAMETER procedure, you can run the SQL Tuning Advisor in test execute mode to save time.

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%';

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