**Strategies**: (1) **Parallel loads**: 5 parallel jobs, one per table. (2) **Bulk insert**: COPY/BULK INSERT, not row-by-row. (3) **Batch size**: 5K–10K rows per batch. (4) **Staging**: Load to staging; single transaction swap. (5) **Indexes**: Disable during load; rebuild after. (6) **Network**: Co-locate (same region). **50K × 5**: Typically seconds with COPY....
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