DS0-001 Data Systems Management Practice Question
A DBA is troubleshooting a slow query. The execution plan indicates an 'Implicit Conversion' is occurring, which prevents the use of an index seek. What is the most likely cause?
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
✓
Data type mismatch between column and parameter
An implicit conversion happens when the data type of a column does not match the data type of the constant or parameter being compared to it, forcing the engine to convert every row.
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 database collation is incorrect
Why it's wrong here
Collation issues cause different errors, not index seek suppression due to conversion.
- ✗
The table is not partitioned
Why it's wrong here
Partitioning is for scaling large tables, not implicit conversion issues.
- ✓
Data type mismatch between column and parameter
Why this is correct
When comparing a VARCHAR column to an NVARCHAR parameter, SQL Server must convert the column values to match, preventing index usage.
- ✗
The statistics are outdated
Why it's wrong here
Outdated statistics lead to bad plans, not necessarily implicit conversion.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official CompTIA exam blueprint
This DS0-001 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DS0-001 exam.