Databricks Certified Data Engineer Associate Exam - Topic 3 Question 39 Discussion

Actual exam question for Databricks's Databricks Certified Data Engineer Associate exam

Question #: 39
Topic #: 3

[All Databricks Certified Data Engineer Associate Questions]

A data engineer runs a statement every day to copy the previous day's sales into the table transactions. Each day's sales are in their own file in the location "/transactions/raw".

Today, the data engineer runs the following command to complete this task:

After running the command today, the data engineer notices that the number of records in table transactions has not changed.

Which of the following describes why the statement might not have copied any new records into the table?

AThe format of the files to be copied were not included with the FORMAT_OPTIONS keyword.

BThe names of the files to be copied were not included with the FILES keyword.

CThe previous day's file has already been copied into the table.

DThe PARQUET file format does not support COPY INTO.

EThe COPY INTO statement requires the table to be refreshed to view the copied rows.

Show Suggested Answer

Suggested Answer: B

dbfs:/user/hive/warehouse Thereby showing 'dbfs:/user/hive/warehouse/customer360.db

The location of the customer360 database depends on the value of thespark.sql.warehouse.dirconfiguration property, which specifies the default location for managed databases and tables. If the property is not set, the default value isdbfs:/user/hive/warehouse. Therefore, the customer360 database will be located indbfs:/user/hive/warehouse/customer360.db. However, if the property is set to a different value, such asdbfs:/user/hive/database, then the customer360 database will be located indbfs:/user/hive/database/customer360.db. Thus, more information is needed to determine the correct response.

Option A is not correct, asdbfs:/user/hive/database/customer360is not the default location for managed databases and tables, unless thespark.sql.warehouse.dirproperty is explicitly set todbfs:/user/hive/database.

Option B is not correct, asdbfs:/user/hive/warehouseis the default location for the root directory of managed databases and tables, not for a specific database. The database name should be appended with.dbto the directory path, such asdbfs:/user/hive/warehouse/customer360.db.

Option C is not correct, asdbfs:/user/hive/customer360is not a valid location for a managed database, as it does not follow the directory structure specified by thespark.sql.warehouse.dirproperty.

Databases and Tables

[Databricks Data Engineer Professional Exam Guide]

by Thad at Sep 17, 2024, 12:18 AM

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Emily

6 months ago

I disagree, refreshing the table shouldn't be necessary for new records.

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Derick

6 months ago

Definitely needs the FORMAT_OPTIONS included, that's a common mistake.

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Lyndia

6 months ago

Wait, does PARQUET really not support COPY INTO? That seems odd.

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Fletcher

7 months ago

I think they forgot to specify the FILES keyword!

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Audry

7 months ago

Sounds like the previous day's file was already copied.

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Kallie

7 months ago

I’m a bit confused about the PARQUET format; I thought it was supported, so maybe option D isn't correct?

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Margarita

7 months ago

I practiced a similar question where the file names were crucial, so I wonder if option B might be the reason for no new records.

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Teresita

7 months ago

I think it could be option C because if the previous day's file was already copied, then there wouldn't be any new records to add.

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Myrtie

8 months ago

I remember something about needing to specify the file format, but I’m not sure if that’s the main issue here.

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Roosevelt

8 months ago

This seems straightforward enough. My guess is that the previous day's file has already been copied, so option C is the likely answer. I'll make sure to carefully review the file history and table contents to confirm.

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Denae

8 months ago

I'm a bit confused by this one. The command looks correct, but the lack of change in the table records is puzzling. I'll need to consider all the possible reasons why the data might not have been copied over.

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Adelle

8 months ago

Okay, let's see. The question says the files are in PARQUET format, so I'm thinking option D might be the culprit here. I'll double-check the supported file formats for COPY INTO.

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Helga

8 months ago

Hmm, this is a tricky one. I'll need to carefully review the details of the COPY INTO statement and the file format options to determine what might be causing the issue.

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Maile

8 months ago

Alright, time to put on my problem-solving hat. I'm leaning towards option B - the file names might not have been specified correctly. I'll review the syntax and make sure I understand how to properly reference the files.

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Marsha

8 months ago

This is a good opportunity to demonstrate my understanding of change management. The steering committee should have a broad mandate to oversee the entire process, from planning to implementation and ensuring alignment with the company's objectives.

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Glenn

1 year ago

I bet the data engineer is just trying to copy and paste their way to success. Hey, maybe they can use the CTRL+C, CTRL+V command next time!

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Hannah

11 months ago

User 4: The data engineer should double-check the command and make sure everything is correct.

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Tawny

11 months ago

User 3: It's possible that the table needs to be refreshed to view the copied rows.

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Cecily

11 months ago

User 2: Yeah, that could be the issue. Or maybe the previous day's file has already been copied.

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Flo

11 months ago

User 1: Maybe the files to be copied were not included in the command.

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Eladia

12 months ago

User 3: It's possible. The data engineer might need to refresh the table to see the copied rows.

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Dana

12 months ago

User 2: That could be it. Or maybe the previous day's file has already been copied.

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Ciara

12 months ago

User 1: Maybe the format of the files was not included in the command.

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Arleen

1 year ago

I'm with Tracey on this one. C) is the way to go. Although, if the data engineer is running this command every day, they might want to consider automating the process. Less work for them, you know?

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Arlette

12 months ago

Automation would definitely save time and prevent errors in this case.

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Pearly

12 months ago

Yeah, I agree. It's possible that the data engineer is just duplicating the same data every day.

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Sol

1 year ago

I think C) makes sense. The file might have already been copied before.

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Tracey

1 year ago

Hmm, this is a tricky one. I'm going to go with C) The previous day's file has already been copied into the table. That seems like the most logical explanation.

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Lonny

12 months ago

Yeah, it makes sense. Maybe the data engineer should double-check to confirm.

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Mayra

12 months ago

I agree, that could be the reason why the number of records didn't change.

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Aleta

12 months ago

I think you might be right. It's possible that the file was already copied before.

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Amie

1 year ago

I'm not sure about this one. It could be B) The names of the files to be copied were not included with the FILES keyword, or it could be E) The COPY INTO statement requires the table to be refreshed to view the copied rows.

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Sherill

1 year ago

I think the answer is C) The previous day's file has already been copied into the table. The command runs every day, so it's likely that the previous day's file has already been copied.

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