What criteria should be considered when determining the transaction execution mode in a system?

When determining the transaction execution mode in a system, the following criteria should be considered:

• Atomicity of operations: whether all operations within a transaction need to be fully completed or rolled back in case of an error.
• Isolation: the level of transaction isolation (e.g., Read Committed, Serializable) affects concurrency and potential conflicts.
• Transaction duration: short transactions reduce locking and improve performance.
• Load type and conflict frequency: under high contention, modes with stricter isolation should be chosen.
• Support for rollback and retries: important for ensuring reliability.
• Features of the used DBMS and drivers: some modes may not be supported or may work with limitations.

In Go, for example, when working with databases via database/sql, transactions can be managed using methods Begin(), Commit(), Rollback(), selecting the appropriate isolation level through driver settings or SQL queries.