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Question 27 - DEA-C01 discussion

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Partition columns optimize query performance by pruning out the data files that do not need to be scanned (i.e. partitioning the external table). Which pseudocolumn of External table evaluate as an expression that parses the path and/or filename information.

A.
METADATA$ROW_NUMBER
Answers
A.
METADATA$ROW_NUMBER
B.
METADATA$COLUMNNAME
Answers
B.
METADATA$COLUMNNAME
C.
METADATA$FILEPATH
Answers
C.
METADATA$FILEPATH
D.
METADATA$FILENAME
Answers
D.
METADATA$FILENAME
Suggested answer: D

Explanation:

METADATA$FILENAME

A pseudocolumn that identifies the name of each staged data file included in the external table, including its path in the stage.

An external table creator defines partition columns in a new external table as expressions that parse the path and/or filename information stored in the METADATA$FILENAME pseudocolumn. A partition consists of all data files that match the path and/or filename in the expression for the parti-tion column.

asked 23/09/2024
Ricardo Rodrigues
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