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Alibaba Cloud ACA-BigData1 - ACA Big Data Certification Exam

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Total 78 questions

Synchronous development in DataWorks provides both wizard and script modes.

Score 1

A.

True

B.

False

Assume that Task 1 is configured to run at 02:00 each day. In this case, the scheduling system

automatically generates a snapshot at the time predefined by the periodic node task at 23:30 each day.

That is, the instance of Task 1 will run at 02:00 the next day. If the system detects the upstream task is

complete, the system automatically runs the Task 1 instance at 02:00 the next day.

Score 1

A.

True

B.

False

Where is the meta data (e.g.,table schemas) in Hive?

A.

Stored as metadata on the NameNode

B.

Stored along with the data in HDFS

C.

Stored in the RDBMS like MySQL

D.

Stored in ZooKeeper

Which of the following is not proper for granting the permission on a L4 MaxCompute table to a

user. (L4 is a level in MaxCompute Label-based security (LabelSecurity), it is a required MaxCompute

Access Control (MAC) policy at the project space level. It allows project administrators to control the

user access to column-level sensitive data with improved flexibility.)

Score 2

A.

If no permissions have been granted to the user and the user does not belong to the project, add the

user to the project. The user does not have any permissions before they are added to the project.

B.

Grant a specific operation permission to the user.

C.

If the user manages resources that have labels, such as datasheets and packages with datasheets,

grant label permissions to the user.

D.

The user need to create a project in simple mode

A distributed file system like GFS and Hadoop are design to have much larger block(or chunk) size

like 64MB or 128MB, which of the following descriptions are correct? (Number of correct answers: 4)

Score 2

A.

It reduces clients' need to interact with the master because reads and writes on the same block( or

chunck) require only one initial request to the master for block location information

B.

Since on a large block(or chunk), a client is more likely to perform many operations on a given block, it

can reduce network overhead by keeping a persistent TCP connection to the metadata server over an

extended period of time

C.

It reduces the size of the metadata stored on the master

D.

The servers storing those blocks may become hot spots if many clients are accessing the same small

files

E.

If necessary to support even larger file systems, the cost of adding extra memory to the meta data

server is a big price

In DataWorks, a task should be instantiated first before a

scheduled task is running every time, that is, generating a

corresponding instance which is executed for running the

scheduled task. The status is different in each phase of the

scheduling process, including ________. (Number of correct

answers: 3)

A.

Not running

B.

Running

C.

Running Successfully

A start-up company wants to use Alibaba Cloud MaxCompute to provide product recommendation

services for its users. However, the company does not have much users at the initial stage, while the

charge for MaxCompute is higher than that of ApsaraDB RDS, so the company should be recommended

to use MaxCompute service until the number of its users increases to a certain size.

Score 1

A.

True

B.

False

When odpscmd is used to connect to a project in MaxCompute, the command ______ can be

executed to view the size of the space occupied by table table_a.

Score 2

A.

select size from table_a;

B.

size table_a;

C.

desc table_a;

D.

show table table_a;

Project is an important concept in MaxCompute. A user can create multiple projects, and each object

belongs to a certain project.

Score 1

A.

True

B.

False

The data development mode in DataWorks has been upgraded to the three-level structure

comprising of _____, _____, and ______. (Number of correct answers: 3)

Score 2

A.

Project

B.

Solution

C.

Business flow

D.

Directory