Pessimistic Distributed Transaction

Pessimistic distributed transaction will use the following concepts to achieve ACID(Atomic, Consistency, Isolation, Durable).

1. Two phase locking
2. Two phase commits

Two phase locking

• Lock object before using it
• Hold the lock until it finished the transaction

Two phase commits

• Prepare commit will log all required modification and changes in write ahead logs.
• Perform commit will apply all changes written in the write ahead log to the database.