When a knowledge base system rejects uploaded files, the root cause is often not the file itself. In this case study, an engineer discovered that the real issue was a failed Domain Index on an Oracle table, which caused chunk-saving operations to fail with misleading logs. The post walks through a systematic approach: reproducing with a small file, examining logs, and finally checking database object states. This highlights a common pitfall in Oracle-backed applications where index health can silently break functionality. For engineers, this serves as a reminder to look beyond application-level errors and inspect database metadata when troubleshooting. The methodology is transferable to other database systems and complex file-processing pipelines.
A debugging case where file parsing failures were traced to a failed Oracle Domain Index, not the file itself. Learn how to isolate such root causes.