Examine the following query output:
You issue the following command to import tables into the hr schema:
$ > impdp hr/hr directory = dumpdir dumpfile = hr_new.dmp schemas=hrTRANSFORM=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:
Oracle Data Pump disable redo logging when loading data into tables and when creating indexes.
The new TRANSFORM option introduced in data pumps import provides the flexibility to turn off the redo
generation for the objects during the course of import. The Master Table is used to track the detailed progress
information of a Data Pump job.
The Master Table is created in the schema of the current user running the Pump Dump export or import, and it
keeps tracks of lots of detailed information.
he 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.