SPLK-1001 Using Fields and Lookups Practice Question
A user runs a search and uses `| lookup mylookup myfield OUTPUT myfield2`. The search returns events that have myfield values, but myfield2 is null. The lookup file has matching entries. What is the most likely issue?
⚠ Common exam trap
Splunk often tests the nuance between case-sensitive and case-insensitive lookups, and the trap here is that candidates assume lookups are always case-insensitive by default, forgetting that the lookup definition can be explicitly configured for case-sensitive matching.
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
✓
The lookup definition is case-sensitive and the event values have different case.
The lookup definition in Splunk has a case-sensitivity setting. By default, lookups are case-insensitive, but if the lookup definition is configured to be case-sensitive, then the lookup will only match when the case of the event field value exactly matches the case in the lookup file. Since the events have myfield values but myfield2 is null, the lookup is failing to match due to case differences, even though the lookup file has matching entries.
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 lookup definition is case-sensitive and the event values have different case.
Why this is correct
Case mismatch prevents matching.
- ✗
The lookup definition is missing the max_matches setting.
Why it's wrong here
Missing max_matches defaults to 1, not null.
- ✗
The lookup file has duplicate keys.
Why it's wrong here
Duplicates would not cause null; they might cause multiple matches.
- ✗
The lookup command should use OUTPUTNEW instead of OUTPUT.
Why it's wrong here
OUTPUTNEW only applies if field already exists; null is not from overwrite.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SPLK-1001 practice question is part of Courseiva's free Splunk 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 SPLK-1001 exam.