A transaction T reaches its commit point when all operations are successfully executed and recorded in the log, indicating that the transaction can be committed to the database while ensuring it adheres to ACID properties.
A transaction T reaches its commit point when all its operations that access the database have been executed successfully and the effect of all the transaction operations on the database has been recorded in the log. At this point, the transaction is considered complete and its changes to the database can be made permanent. Committing a transaction ensures that all the operations within it are executed as a single unit and allows the database to maintain consistency even in cases of system failures.
In the context of database systems, transactions must adhere to ACID properties—Atomicity, Consistency, Isolation, Durability—to safeguard the integrity of the database. The commit point marks the transition where the transaction has satisfied these properties and its outcome can safely be made durable. If a transaction fails before reaching the commit point, it must be rolled back to ensure the database remains in a consistent state.
Reaching the commit point signifies the successful completion of a transaction, allowing it to be committed to the database, and making it possible for the system to recover to a consistent state in the event of any failure.