DEA-C01 Data Operations and Support Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company uses Amazon Redshift for its data warehouse. A data engineer notices that queries are running slowly and the system's disk space is nearly full. The engineer runs the STV_PARTITIONS view and sees that many slices have high 'tossed' counts. What does this indicate, and what should the engineer do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The tossed rows are deleted rows that need to be reclaimed by running VACUUM.
Option A is correct because 'tossed' rows indicate data that was deleted or updated and is waiting for VACUUM. A high tossed count means wasted space. Running VACUUM reclaims that space. Option B is wrong because 'tossed' does not indicate sort key issues. Option C is wrong because 'tossed' is not about distribution. Option D is wrong because deep copy is a more drastic alternative, but VACUUM is the standard action.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The tossed rows are permanent and cannot be reclaimed; the engineer should perform a deep copy to a new table.
Why it's wrong here
Tossed rows can be reclaimed by VACUUM; deep copy is an alternative but not the first action.
✗
The tossed rows indicate that the sort key is not optimal; redefining the sort key will reduce tossed rows.
Why it's wrong here
Tossed rows are related to DELETE/UPDATE operations, not sort keys.
✗
The tossed rows are due to data skew; redistribute the table on a different distribution key.
Why it's wrong here
Data skew is shown by uneven slice sizes, not tossed counts.
✓
The tossed rows are deleted rows that need to be reclaimed by running VACUUM.
Why this is correct
VACUUM removes deleted rows and reclaims disk space, improving query performance.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Trap categories for this question
Command / output trap
Data skew is shown by uneven slice sizes, not tossed counts.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DEA-C01 NAT questions on configuration and troubleshooting.
Data Operations and Support — This question tests Data Operations and Support — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The tossed rows are deleted rows that need to be reclaimed by running VACUUM. — Option A is correct because 'tossed' rows indicate data that was deleted or updated and is waiting for VACUUM. A high tossed count means wasted space. Running VACUUM reclaims that space. Option B is wrong because 'tossed' does not indicate sort key issues. Option C is wrong because 'tossed' is not about distribution. Option D is wrong because deep copy is a more drastic alternative, but VACUUM is the standard action.
What should I do if I get this DEA-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DEA-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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