oracle 12c ocp - 3

发布时间：2019-08-26 07:19:02编辑：auto阅读（1687）

    Examine the following query output:

    blob.png

    You issue the following command to import tables into the hr schema:

    $ > impdp hr/hr directory = dumpdir dumpfile = hr_new.dmp schemas=hr TRANSFORM=DISABLE_ARCHIVE_LOGGING: Y

    Which statement is true?

    A. All database operations performed by the impdp command are logged.

    B. Only CREATE INDEX and CREATE TABLE statements generated by the import are logged.

    C. Only CREATE TABLE and ALTER TABLE statements generated by the import are logged.

    D. None of the operations against the master table used by Oracle Data Pump to coordinate its activities are logged.



    Explanation:

    2.4.4.6 Oracle Data Pump No Logging Option for Import

    The new TRANSFORM option, DISABLE_ARCHIVE_LOGGING, to the impdp command line causes Oracle Data Pump to disable redo logging when loading data into tables and when creating indexes. It also adds the same option as part of the PL/SQL DBMS_DATAPUMP package. With redo logging disabled, the disk space required for redo logs during an Oracle Data Pump import is smaller. However, to ensure recovery from media failure, the DBA should do an RMAN backup after the import completes.

    Even with this parameter specified, there is still redo logging for other operations of Oracle Data Pump. This includes all CREATE and ALTER statements, except CREATE INDEX, and all operations against the master table used by Oracle Data Pump during the import.


    https://docs.oracle.com/database/121/NEWFT/chapter12101.htm#NEWFT107

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