Can the Serializable transaction isolation level be applied in all cases?

The Serializable transaction isolation level provides maximum isolation, preventing issues such as phantom reads, non-repeatable reads, and dirty reads. However, it is not recommended to use it in all cases for the following reasons:

• Performance: Serializable locks more resources and can significantly reduce system throughput.
• The possibility of deadlocks increases.
• Such strict isolation is not always necessary, especially if the business logic allows for weaker levels.

Therefore, the choice of isolation level should be based on data consistency requirements and performance considerations. In most cases, lower levels than Serializable, such as Repeatable Read or Read Committed, are used.