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Free Oracle 1Z0-449 Exam Braindumps (page: 2)

Page 2 of 36
PDF with 72 Questions
QUESTION: 1
How should you encrypt the Hadoop data that sits on disk?

A. Enable Transparent Data Encryption by using the Mammoth utility.
B. Enable HDFS Transparent Encryption by using bdacli on a Kerberos-secured cluster.
C. Enable HDFS Transparent Encryption on a non-Kerberos secured cluster.
D. Enable Audit Vault and Database Firewall for Hadoop by using the Mammoth utility.

Answer(s): B
Explanation:
HDFS Transparent Encryption protects Hadoop data that's at rest on disk. When the encryption
is enabled for a cluster, data write and read operations on encrypted zones (HDFS directories)
on the disk are automatically encrypted and decrypted. This process is "transparent" because
it's invisible to the application working with the data.
The cluster where you want to use HDFS Transparent Encryption must have Kerberos enabled.
QUESTION: 2
What are two reasons that a MapReduce job is not run when the following command is
executed in Hive? (Choose two.)
hive> create view v_consolidated_credit_products as select
hcd.customer_id, hcd.credit_card_limits, hcd.credit_balance, hmda.n_mortgages,
hmda.mortgage_amount
from mortgages_department_agg hmda join credit_department hcd on
hcd.customer_id=hmda.customer_id;
OK
Time taken: 0.316 seconds

A. The MapReduce job is run when the view is accessed.
B. MapReduce is run; the command output is incorrect.
C. MapReduce is not run with Hive. Hive bypasses the MapReduce layer.
D. A view only defines the metadata in the RDBMS store.
E. MapReduce is run in the background.

Answer(s): A, D
Explanation:
The CREATE VIEW statement lets you create a shorthand abbreviation for a more complicated
query. The base query can involve joins, expressions, reordered columns, column aliases, and
other SQL features that can make a query hard to understand or maintain.
Because a view is purely a logical construct (an alias for a query) with no physical data behind
it, ALTER VIEW only involves changes to metadata in the metastore database, not any data
files in HDFS.
Reference:
https://www.cloudera.com/documentation/enterprise/5-6- x/topics/impala_create_view.html
QUESTION: 3
Your customer is spending a lot of money on archiving data to comply with government
regulations to retain data for 10 years.
How should you reduce your customer's archival costs?
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