How does Teradata handle concurrent access and data loading?

In Teradata, concurrent access and data loading can be handled in a few different ways.

1. By utilizing locking mechanisms, Teradata supports both row-level and table-level locks, which can be used during data loading or querying processes to control concurrent access. Setting the appropriate lock level and type helps ensure data consistency and integrity.
2. By using transaction control in Teradata, you can ensure data consistency and integrity by defining transaction boundaries with BEGIN TRANSACTION and END TRANSACTION statements.
3. Using queue controls: Teradata offers a Workload Management feature that allows for setting workload and resource allocation strategies to control the priority and quantity of concurrent access and data loading.
4. Retry mechanism can be used to ensure data integrity and consistency by re-executing operations in case of concurrent access or data loading failures during the process of data loading or querying.

Overall, handling concurrent access and data loading in Teradata requires a comprehensive consideration of factors such as lock mechanisms, transaction control, workload management, and retry mechanisms to ensure data consistency and integrity.