What is the default transaction isolation level in SAP HANA?

In SAP HANA, the default transaction isolation level is Read Committed. This isolation level ensures that any data read during a transaction reflects all transactions that have been committed before the start of the current transaction. This means that a transaction will not see changes made by other transactions that have not yet been committed, providing a balance between performance and consistency.

Using Read Committed mitigates issues such as dirty reads, where a transaction reads data that has been modified but not yet committed by another transaction. It allows for a more consistent and reliable view of the data, which is particularly important in environments where multiple transactions are occurring simultaneously.

This isolation level supports a number of common scenarios in SAP HANA databases, ensuring that applications can operate efficiently while maintaining accurate and up-to-date data presentation.