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Question 198 - DBS-C01 discussion

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A corporation wishes to move a 1 TB Oracle database from its current location to an Amazon Aurora PostgreSQL DB cluster. The database specialist at the firm noticed that the Oracle database stores 100 GB of large binary objects (LOBs) across many tables. The Oracle database supports LOBs up to 500 MB in size and an average of 350 MB. AWS DMS was picked by the Database Specialist to transfer the data with the most replication instances.

How should the database specialist improve the transfer of the database to AWS DMS?

A.
Create a single task using full LOB mode with a LOB chunk size of 500 MB to migrate the data and LOBs together
Answers
A.
Create a single task using full LOB mode with a LOB chunk size of 500 MB to migrate the data and LOBs together
B.
Create two tasks: task1 with LOB tables using full LOB mode with a LOB chunk size of 500 MB and task2 without LOBs
Answers
B.
Create two tasks: task1 with LOB tables using full LOB mode with a LOB chunk size of 500 MB and task2 without LOBs
C.
Create two tasks: task1 with LOB tables using limited LOB mode with a maximum LOB size of 500 MB and task 2 without LOBs
Answers
C.
Create two tasks: task1 with LOB tables using limited LOB mode with a maximum LOB size of 500 MB and task 2 without LOBs
D.
Create a single task using limited LOB mode with a maximum LOB size of 500 MB to migrate data and LOBs together
Answers
D.
Create a single task using limited LOB mode with a maximum LOB size of 500 MB to migrate data and LOBs together
Suggested answer: C

Explanation:


https://docs.aws.amazon.com/dms/latest/userguide/CHAP_BestPractices.html#CHAP_BestPractices.LOBS,

"AWS DMS migrates LOB data in two phases:

1. AWS DMS creates a new row in the target table and populates the row with all data except the associated LOB value.

2.AWS DMS updates the row in the target table with the LOB data." This means that we would need two tasks, one per phase and use limited LOB mode for best performance.

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asked 16/09/2024
Frederik Pardon
36 questions
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