**Single Command**: `sqoop import-all-tables` with `--exclude-tables` for large/irrelevant tables.
```bash
sqoop import-all-tables --connect jdbc:mysql://host/sales_db \
--username user -P --warehouse-dir /user/hive/warehouse \
--exclude-tables audit_log,temp_data --num-mappers 4
```
**Why Not Always import-all-tables**: (1) No per-table `--split-by`—Sqoop picks primary key; composite or missing PK causes single-mapper. (2) All-or-nothing—one failure fails all....
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