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

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

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Whether There Are Composite Hash Indexes in the Source Collection

Migration and Synchronization from MongoDB to DDS

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

Parent topic: Database Parameters

Previous topic: Whether Foreign Keys Are Disabled or Tables to Be Synchronized Have Foreign Keys in the Destination Database

Next topic: Whether There Are Composite Hash Shard Keys in the Source Collection

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