Why Mass contact import halting at 54%, seems it dues to CRM index deadlocks, can someone please help?

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Why Mass contact import halting at 54%, seems it dues to CRM index deadlocks, can someone please help?

RahmaNali 20

During our large-scale contact data migration, the batch ingestion job consistently stalls at 54% due to severe database contention and recurring deadlock conditions within the CRM deduplication index. To unblock this import pipeline and reduce latency, what is the supported procedure for temporarily bypassing or disabling automatic record matching and deduplication logic during high-volume bulk updates?

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HLBui 13,020 Independent Advisor

Good day Rahma Nali

During large‑scale migrations, the CRM deduplication engine often becomes the bottleneck. The supported procedure is to temporarily disable the record matching and deduplication logic so the batch ingestion can run without locking the index. Most CRM platforms provide a “bulk insert” or “disable duplicate detection during bulk operations” flag that you can enable for the import job. This way, the system skips deduplication checks while loading data, and you avoid the deadlocks. Once the migration is complete, you can re‑enable deduplication and let the engine reconcile records. It’s also smart to monitor database performance during the import, since contention can still occur if the batch size is too large. Splitting the ingestion into smaller chunks can help reduce latency. Afterward, run a post‑deduplication process to clean up any duplicates created during the bypass.

If this explanation helps you unblock the pipeline and reduce latency, please hit “accept answer” so we know it was useful!

HLBui 13,020 Reputation points Independent Advisor

2026-09-29T03:05:34.36+00:00

How is everything? Have you been able to solve the problem? If you have, it's really appreciated to "Accept the answer" as a way to share your experience with the community. Thank you!
RahmaNali 20 Reputation points

2026-09-30T03:58:47.01+00:00

Hi HLBui

One more question. If duplicate detection is disabled during migration, what is the recommended post-deduplication process to clean up duplicate records efficiently ?
HLBui 13,020 Reputation points Independent Advisor

2026-09-30T04:17:31.1933333+00:00

The recommended approach is to re-enable duplicate detection after the migration completes and then run a dedicated post-migration deduplication job against the newly imported records. Most CRM platforms provide built-in duplicate detection or matching rules that can identify potential duplicates in bulk, making the cleanup process much more efficient.

I typically reviewing the detected duplicates in batches and using automated merge capabilities wherever possible, especially for large datasets. If the volume is very high, consider processing records in smaller groups to avoid placing additional load on the database.