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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 Streams pool is a new SGA structure starting in Oracle 10g. Streams itself is a new database feature as of Oracle9i Release 2 and above. It was designed as a data sharing/replication tool and is Oracle s stated direction going forward for data replication.

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.

A process P1 needs to send commands to P2. The frequency of commands is unknown or extremely variable. The system is sensitive to the processing load of P2, and it is crucial for P2 to never miss a command.

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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%';

Note The statement that Streams is Oracle s stated direction going forward for data replication should

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

Forces If commands are expected to be infrequent, it is inefficient for P2 to continually poll P1 to see if commands are available. Since P1 knows when commands need to be sent, and you want P2 to get commands as soon as possible, it is more efficient to let P1 control the interaction.

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.

not be interpreted as meaning that Advanced Replication, Oracle s now legacy replication feature, is going away anytime soon. Rather, Advanced Replication will continue to be supported in future releases. To learn more about Streams itself, see the Streams Concepts Guide available on http://otn.oracle.com in the Documentation section.

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>

The Streams pool (or up to 10 percent of the Shared pool if no Streams pool is configured) is used to buffer queue messages used by the Streams process as it is moving/copying data from one database to another. Instead of using permanent disk-based queues, with the attendant overhead associated with them, Streams uses in-memory queues. If these queues fill up, they will spill over to disk eventually. If the Oracle instance with the memory queue fails for some reason, due to an instance failure (software crash), power failure, or whatever, these in-memory queues are rebuilt from the redo logs. So, the Streams pool will only be important in systems using the Streams database feature. In those environments, it should be set in order to avoid stealing 10 percent of the Shared pool for this feature.

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