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

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

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?

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

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38 comments · newest first
EM
Emily 10 months ago
I disagree, refreshing the table shouldn't be necessary for new records.
DE
Derick 11 months ago
Definitely needs the FORMAT_OPTIONS included, that's a common mistake.
LY
Lyndia 11 months ago
Wait, does PARQUET really not support COPY INTO? That seems odd.
FL
Fletcher 11 months ago
I think they forgot to specify the FILES keyword!
AU
Audry 11 months ago
Sounds like the previous day's file was already copied.
KA
Kallie 12 months ago
I’m a bit confused about the PARQUET format; I thought it was supported, so maybe option D isn't correct?
MA
Margarita 12 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.
TE
Teresita 12 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.
MY
Myrtie 1 year ago
I remember something about needing to specify the file format, but I’m not sure if that’s the main issue here.
RO
Roosevelt 1 year 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.
DE
Denae 1 year 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.
AD
Adelle 1 year 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.
HE
Helga 1 year 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.
MA
Maile 1 year 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.
MA
Marsha 1 year 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.
GL
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!
HA
Hannah 1 year ago
↳ replying to Glenn
User 4: The data engineer should double-check the command and make sure everything is correct.
TA
Tawny 1 year ago
↳ replying to Glenn
User 3: It's possible that the table needs to be refreshed to view the copied rows.
CE
Cecily 1 year ago
↳ replying to Glenn
User 2: Yeah, that could be the issue. Or maybe the previous day's file has already been copied.
FL
Flo 1 year ago
↳ replying to Glenn
User 1: Maybe the files to be copied were not included in the command.
EL
Eladia 1 year ago
↳ replying to Glenn
User 3: It's possible. The data engineer might need to refresh the table to see the copied rows.
DA
Dana 1 year ago
↳ replying to Glenn
User 2: That could be it. Or maybe the previous day's file has already been copied.
CI
Ciara 1 year ago
↳ replying to Glenn
User 1: Maybe the format of the files was not included in the command.
AR
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?
AR
Arlette 1 year ago
↳ replying to Arleen
Automation would definitely save time and prevent errors in this case.
PE
Pearly 1 year ago
↳ replying to Arleen
Yeah, I agree. It's possible that the data engineer is just duplicating the same data every day.
SO
Sol 1 year ago
↳ replying to Arleen
I think C) makes sense. The file might have already been copied before.
TR
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.
LO
Lonny 1 year ago
↳ replying to Tracey
Yeah, it makes sense. Maybe the data engineer should double-check to confirm.
MA
Mayra 1 year ago
↳ replying to Tracey
I agree, that could be the reason why the number of records didn't change.
AL
Aleta 1 year ago
↳ replying to Tracey
I think you might be right. It's possible that the file was already copied before.
AM
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.
SH
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.
GL
Glen 1 year ago
↳ replying to Sherill
User 2: That makes sense, the command runs every day so it's possible that it's already been copied.
MA
Margot 1 year ago
↳ replying to Sherill
User 1: I think the answer is C) The previous day's file has already been copied into the table.
SK
Skye 2 years ago
But could it also be that the previous day's file has already been copied into the table?
TR
Truman 2 years ago
I agree with Deja. The FORMAT_OPTIONS keyword might be missing in the command.
DE
Deja 2 years ago
I think the reason might be that the format of the files was not included in the command.
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