A schedule where a transaction cannot read or write an item X until the last transaction that wrote X has committed is known as a strict schedule. It maintains data consistency by using strict two-phase locking and prevents phenomena like dirty reads and uncommitted dependencies.
The schedule in question where a transaction cannot read or write an item X until the last transaction that wrote X has committed is known as a strict schedule. This type of schedule is used in database management to maintain data consistency and integrity. With a strict schedule, transactions follow strict two-phase locking (S2PL), meaning that once a transaction has obtained a lock on a data item, it retains that lock until it commits, ensuring no other transaction can interfere with the data item, potentially causing inconsistencies.
In a strict schedule, the goal is to prevent phenomena like dirty reads and uncommitted dependencies, which can occur when transactions are allowed to access data before the initial transaction is completed. This strict adherence to the transaction order helps in maintaining the ACID properties (Atomicity, Consistency, Isolation, Durability) which are critical for transactional systems
Strict schedules are crucial for ensuring the orderly execution of transactions and maintaining the integrity of a database, by preventing premature access to data items before the completion of previous transactions.