Database.upsert() Lock Errors: The Silent Failure Pattern
When Database.upsert() encounters UNABLE_TO_LOCK_ROW, the error appears in UpsertResult objects — not as an exception. Without explicit handling, lock contention silently drops records.
2 docs tagged with "upsert"
View all tagsExternal ID Upsert as a Race Condition Defense Strategy
How Database.upsert() with external ID fields prevents duplicate record creation in concurrent integration scenarios, and when additional concurrency controls are needed.