Spring Transaction Isolation Level

Spring Transaction Isolation Level

The standard levels are 2,3,4,5, the higher level, the poorer concurrency/effi

1. ISOLATION_DEFAULT (Spring)
   This is a PlatformTransactionManager Default isolation level, using Default Database transaction level. The other 4 are correspond to JDBC isolation level
2. ISOLATION_READ_UNCOMMITTED
   Lowest isolation level. Allow other transaction to see the data from this transaction. This level can cause dirty read, non-repeatable read, and illusion read
3. ISOLATION_READ_COMMITTED (normally used)
   Promise other transaction can read data until this transaction committed.
4. ISOLATION_REPEATABLE_READ
   Prevent dirty read, non-repeatable read. But can illusion read.
5. ISOLATION_SERIALIZABLE
   This is most expensive level, but most reliable. It promise Sequence. Prevent dirty read, non-repeatable read, and illusion read