The most likely cause is that the JDBC driver has a default row limit that caps the number of records imported. JDBC drivers commonly impose a built-in row limit—often 10,000 rows—to prevent memory overload during data retrieval from an external database. Even when the import job completes successfully, this limit silently truncates the result set, so only partial data loads into ServiceNow. On the ServiceNow Certified Application Developer CAD exam, this scenario tests your understanding of how JDBC connectivity and driver configurations affect data imports, often appearing as a trick where the import runs without errors but delivers incomplete records. A common trap is assuming the issue lies in the transform map or field mapping, when the real culprit is the driver’s fetch size. Remember the mnemonic: “Driver’s default divides data—disable the limit to load it all.”
SNOW-CAD Integrating and managing application data Practice Question
This SNOW-CAD practice question tests your understanding of integrating and managing application data. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 ServiceNow admin is troubleshooting a data import from an external database via JDBC. The import runs successfully but only loads partial data. Which is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The JDBC driver has a default row limit that caps the number of records imported
JDBC drivers often impose a default row limit (e.g., 10,000 rows) to prevent memory overload during data retrieval. When importing from an external database via JDBC, this limit caps the number of records returned, causing only partial data to load even though the import job completes successfully. The admin must explicitly set the fetch size or disable the row limit in the JDBC URL or driver configuration to import all records.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 scheduled import job was interrupted by another job
Why it's wrong here
Job interruption would cause failure, not partial load.
✗
The transform map has a filter that excludes certain records
Why it's wrong here
Filters on the transform map affect which records are processed, but the question states partial data, not missing specific types.
✗
The field mapping is incorrect and some fields are not being populated
Why it's wrong here
Incorrect field mapping would result in empty fields, not fewer rows.
✓
The JDBC driver has a default row limit that caps the number of records imported
Why this is correct
ServiceNow JDBC imports have a default limit of 50,000 rows, which can be adjusted in the datasource configuration.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume partial data is due to a transform map filter or field mapping error, but the key clue is that the import 'runs successfully' — meaning no errors — which points to a silent cap on row retrieval rather than a configuration or interruption issue.
Detailed technical explanation
How to think about this question
JDBC drivers like MySQL Connector/J use a default fetch size of 0 (meaning fetch all rows at once) or a driver-specific row limit (e.g., SQL Server JDBC driver defaults to 0, but some drivers like the Oracle JDBC thin driver have a default fetch size of 10). However, many JDBC drivers also have a 'maxRows' property that defaults to 0 (unlimited), but some cloud or legacy databases impose a server-side row limit (e.g., 10,000 rows) that the driver respects. In ServiceNow, the JDBC import source uses the standard JDBC API, and if the driver does not explicitly set fetch size or maxRows, the driver's default limit applies, causing partial data loads.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the SNOW-CAD exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Integrating and managing application data — This question tests Integrating and managing application data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The JDBC driver has a default row limit that caps the number of records imported — JDBC drivers often impose a default row limit (e.g., 10,000 rows) to prevent memory overload during data retrieval. When importing from an external database via JDBC, this limit caps the number of records returned, causing only partial data to load even though the import job completes successfully. The admin must explicitly set the fetch size or disable the row limit in the JDBC URL or driver configuration to import all records.
What should I do if I get this SNOW-CAD question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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