# Parallel Importing Considerations

+ Parallel import only supports empty tables
+ Physical import mode is recommended for parallel import
+ Physical import mode and logical import mode cannot be used at the same time to import the same `TiDB` cluster

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Parallel import only supports initialized empty tables in `TiDB` and does not support migrating data to tables with data written by existing services. Otherwise, data inconsistencies may occur.

Parallel import is usually used in the physical import mode.

Apply only one backend at a time when using multiple `TiDB Lightning` instances to import data to the same target. For example, you cannot import data to the same `TiDB` cluster in both the physical and logical import modes at the same time.