1Z0-997-26 Workload Migration Practice Question
During a database migration project using Oracle Zero Downtime Migration (ZDM), the pre-migration validation phase fails with an error indicating that the source database's time zone file version does not match the target OCI Database service time zone file version. How should you resolve this issue?
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
✓
Use the DBMS_DST package on the source database to update the time zone file version to match the target database before restarting the ZDM workflow.
Zero Downtime Migration (ZDM) requires time zone file versions to match between source and target databases to prevent data corruption during transportable tablespace or RMAN migrations. You must update the time zone file version on the source database using DBMS_DST package or apply the appropriate DST patch.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use the DBMS_DST package on the source database to update the time zone file version to match the target database before restarting the ZDM workflow.
Why this is correct
Updating the source database time zone file using DBMS_DST ensures version parity and passes ZDM pre-checks.
- ✗
Manually downgrade the OCI Database service time zone binaries using root OS access.
Why it's wrong here
Managed database services in OCI (like Base DB and Exadata) do not grant root OS access to downgrade core Oracle Database software binaries.
- ✗
Modify the ZDM response file parameter `SKIP_DST_CHECK=TRUE` to bypass the validation check.
Why it's wrong here
Bypassing DST validation can result in corrupted timestamp data after migration.
- ✗
Restart the ZDM migration job using the logical migration workflow instead of the physical workflow.
Why it's wrong here
Logical workflows (Data Pump) are also subject to time zone discrepancies and do not automatically resolve underlying DST version mismatches.
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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 Oracle exam blueprint
This 1Z0-997-26 practice question is part of Courseiva's free Oracle 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 1Z0-997-26 exam.