Help Center/ Data Replication Service/ Troubleshooting/ Troubleshooting/ Solutions to Failed Check Items/ Database Parameters/ Whether There Are Composite Hash Shard Keys in the Source Collection

Updated on 2025-07-21 GMT+08:00

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Whether There Are Composite Hash Shard Keys in the Source Collection

Migration and Synchronization from MongoDB to DDS

**Table 1** Checking whether there are composite hash shard keys in the source collection
Check Item	Whether there are composite hash shard keys in the source collection
Description	There are collections containing composite hash shard keys in the source database.
Failure Cause and Handling Suggestion	Failure cause: The selected collections contain composite hash shard keys. Handling suggestion: Deselect the preceding collections.

Parent topic: Database Parameters

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