Which three statements are true about Oracle Data Pump export and import operations?
A.
You can detach from a data pump export job and reattach later.
B.
Data pump uses parallel execution server processes to implement parallel import.
C.
Data pump import requires the import file to be in a directory owned by the oracle owner.
D.
The master table is the last object to be exported by the data pump.
E.
You can detach from a data pump import job and reattach later.
Explanation:
B: Data Pump can employ multiple worker processes, running in parallel, to
increase job performance.
D: For export jobs, the master table records the location of database objects within a dump file set.
/ Export builds and maintains the master table for the duration of the job. At the end of an exportjob, the content of the master table is written to a file in the dump file set.
/ For import jobs, the master table is loaded from the dump file set and is used to control the
sequence of operations for locating objects that need to be imported into the target database.
A, D, E
A, B , E
ABD
I would guess A, D and E
Weird because A and E are definitley good – you can detach and attach exports and imports.
https://docs.oracle.com/cloud/latest/db121/SUTIL/dp_overview.htm#SUTIL100
And also it is definitley D
https://docs.oracle.com/cloud/latest/db121/SUTIL/dp_overview.htm#SUTIL808
> For export jobs, the master table records the location of database objects within a dump file set. Export builds and maintains the master table for the duration of the job. At the end of an export job, the content of the master table is written to a file in the dump file set.
C is not correct to me.
B sounds also very good. But you have to set PARALLEL option for this. Datapump does not do it by default.
Also the docs say:
> This execution set consists of a combination of worker processes and parallel I/O server processes. The master control process, idle workers, and worker processes acting as parallel execution coordinators in parallel I/O operations do not count toward this total. This parameter enables you to make trade-offs between resource consumption and elapsed time.
So B is not wrong to me but also not 100% correct because it uses not only “server processes” but also “worker processes”
A D E