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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. 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.

All the BACKUP commands in the preceding sections are full backup commands. You can also perform incremental backups using RMAN, and in fact, this is one of the big advantages of using RMAN. Incremental backups are much faster than backing up the entire database. Incremental backups will back up only those data blocks that changed since a previous backup. Incremental backups can be either level 0 or level 1. A level 0 incremental backup copies all data blocks just like a full backup, and acts as the base for subsequent incremental backups. To perform a level 1 incremental backup, you must first have a base level 0 backup.

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.

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RMAN provides two types of incremental backups: Differential backup: Backs up all blocks changed after the most recent incremental backup at level 1 or 0 Cumulative backup: Backs up all blocks changed after the most recent incremental backup at level 0 The following command gets a level 0 backup to start with: RMAN> BACKUP INCREMENTAL LEVEL 0 DATABASE; Once you have the level 0 backup, you perform a level 1 differential incremental backup: RMAN> BACKUP INCREMENTAL LEVEL 1 DATABASE; A cumulative incremental backup at level n will perform a backup of all changed blocks since the last backup at level n 1 or lower So, if you perform the cumulative incremental backup at level 2, it will back up all data blocks changed since level 0 or level 1 The size of your incremental backup file will depend on the number of changed blocks and the incremental level.

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.

Cumulative backups will, in general, be larger than differential backups, since they duplicate the data copied by backups at the same level However, cumulative backups have the advantage that they reduce recovery time, because you only apply only one backup Thus, Oracle recommends using cumulative backups, if space isn t a problem on your server Here s an example that shows how you can use a combination of incremental backups to come up with your backup strategy: On Sunday, perform an incremental level 0 backup On Monday through Saturday, perform differential incremental level 1 backups Repeat the cycle next week In this strategy, if you need to recover data on Thursday evening, you apply the incremental backups from Monday, Tuesday, and Wednesday to Sunday s level 0 backup Consider an alternative strategy using cumulative backups: On Sunday, perform an incremental level 0 backup.

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