3. By splitting, you can give your customers control on data residency, as mandatory in GDPR, 4. By splitting, you limit the exposure in case of SQL injection.

3. By splitting, you can give your customers control on data residency, as mandatory in GDPR, 4. By splitting, you limit the exposure in case of SQL injection. 5. By splitting, you can have good performance for the customer who has 1M records, and good performance for the 100K customers with 10 records.