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NEW QUESTION 40
Jhon is working on an ELT process that sources data from six different source systems.
Looking at the source data, he finds that data about the sample people exists in two of six systems.
What does he have to make sure he checks for in his ELT process?
Choose the best answer.

• A. Duplicate Data.
• B. Invalid Data.
• C. Missing Data.
• D. Redundant Data.

Answer: B

Explanation:
Duplicate Data.
While invalid, redundant, or missing data are all valid concerns, data about people exists in two of the six systems. As such, Jhon needs to account for duplicate data issues.

NEW QUESTION 41
Mario works with a group of R programmers tasked with copying data from an accounting system into a data warehouse.
In what phase are the group's R skills most relevant?

• A. Transform.
• B. Extract.
• C. Load.
• D. Purge.

Answer: A

NEW QUESTION 42
You have a database where queries are performing slowly.
Investigating the results, you find that the database is performing a time-consuming table scan.
What action can best improve the query performance?

• A. Adding an index.
• B. Sub setting the records.
• C. Recompiling the query.
• D. Parameterizing the query.

Answer: A

Explanation:
You create an index to optimize performance when searching the table using the Find function and to establish uniqueness of table columns.
Indexing makes columns faster to query by creating pointers to where data is stored within a database. Imagine you want to find a piece of information that is within a large database. To get this information out of the database the computer will look through every row until it finds it.

NEW QUESTION 43
A table in a hospital database has a column for patient height in inches and a column for patient height in centimeters. This is an example of:

• A. duplicate data.
• B. dependent data.
• C. redundant data
• D. invalid data

Answer: C

NEW QUESTION 44
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