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The master process, or more accurately, the Master Control Process (MCP), has a process name of DMnn The full master process name is in the format <instance>_DMnn_<pid> There is only one master process for each job The master process controls the execution and sequencing of the entire Data Pump job More specifically, the master process performs the following tasks: Creates jobs and controls them Creates and manages the worker processes Monitors the jobs and logs the progress Maintains the job state and restart information in the master table Manages the necessary files, including the dump file set The master process uses a special table called the master table to log the location of the various database objects in the export dump file The master table is like any Oracle table and is at the heart of every Data Pump Export and Import job.

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The master process maintains the job state and restart information in the master table Oracle creates the master table in the schema of the user who is running the Data Pump job at the beginning of every export job The master table contains various types of information pertaining to the current job, such as the state of the objects in the export/import job, the location of the objects in the dump file set, the parameters of the job, and the status of all worker processes The master table has the same name as the export job, such as SYS_EXPORT_SCHEMA_01 The master process uses the master table only for the duration of the export At the end of the export, as the last step in the export job, it writes the contents of the master table to the export dump file and automatically deletes the master table from the database.

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The deletion of the master table will occur automatically, as long as the export completed successfully (or if you issue the KILL_JOB command) However, if you use the STOP_JOB command to stop a job or the export fails for some reason, the master table isn t deleted from the database (Data Pump job commands are described in the Data Pump Export Parameters section later in this chapter) When you restart the export job, it then uses the same master table Since the master table tracks the status of all the objects, Data Pump can easily tell which objects are in the middle of an export and which have been successfully exported to the dump files The master process re-creates the master table saved by the export utility (in the dump file) in the schema of the user who is performing the import.

This is the first step in any Data Pump Import job The Data Pump Import utility reads the contents of the master table to verify the correct sequence in which it should import the various exported database objects As in the case of a Data Pump export, if the import job finishes successfully, Oracle will automatically delete the master table..

The master table contains all the necessary information to restart a stopped job. It is thus the key to Data Pump s job restart capability, regardless of whether you stopped the job intentionally or it died unexpectedly.

The worker process is named <instance>_DWnn_<pid>. It is the process that actually performs the heavy-duty work of loading and unloading data. The master process (DMnn) creates the worker process. The degree of parallelism determines the number of worker processes that the master process will create. The worker processes maintain the rows of the master table. As they export or import various objects, they update the master table with information about the status of the various jobs: completed, pending, or failed.

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When a client logs in to an Oracle server, the database creates an Oracle process to service Data Pump API requests. This shadow process creates the job consisting of the master table and the master process. Once a client detaches, the shadow process automatically disappears.

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The client processes call the Data Pump API. You perform export and import with the two clients, expdp and impdp. In the next section, you ll learn about the various parameters you can specify when you invoke these clients.