DA0-002 Data freshness Practice Question
Network Topology
Refer to the exhibit. An analyst runs this query before acquiring data from a PostgreSQL database. What is the primary purpose of this query?
⚠ Common exam trap
The trap here is that candidates may misinterpret the query as checking data types or primary keys because they see column names like `last_analyzed` or `last_updated` and assume schema inspection. In reality, any column representing a timestamp of last modification or analysis is used to gauge data freshness, not structural properties.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
To check for data freshness
The query shown in the exhibit retrieves the `last_analyzed` column from PostgreSQL's system catalog, which records when table statistics were last updated. Analyzing this timestamp helps the analyst determine if the table's data is fresh enough for the intended analysis, thus checking data freshness before acquisition.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
To verify data types
Why it's wrong here
Data types are not shown in this output.
- ✓
To check for data freshness
Why this is correct
The 'last_analyzed' column shows when statistics were last updated, indicating freshness.
- ✗
To find primary keys
Why it's wrong here
The query does not include primary key information.
- ✗
To identify duplicate tables
Why it's wrong here
The query lists all tables in public schema, not duplicates.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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