A Level Computer Science: Transaction Processing & ACID
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Frequently Asked Questions
What is the significance of ACID rules in transaction processing?
ACID rules ensure the reliability and integrity of transactions in a database. They guarantee that transactions are executed correctly, maintain data consistency, prevent interference between concurrent transactions, and ensure the durability of committed changes.
How does concurrency affect transaction processing in a multi-user database?
Concurrency allows multiple users to access and modify data simultaneously. However, it can introduce challenges such as record locking and deadlocks. Proper management of concurrency is essential to ensure data integrity and prevent conflicts between concurrent transactions.
What is record locking, and why is it important in a multi-user database?
Record locking is a mechanism used to control concurrent access to database records. When a user locks a record, it prevents other users from modifying it until the lock is released. This mechanism ensures data consistency and prevents conflicts that could arise from simultaneous modifications of the same record.
What are deadlocks, and how can they occur in transaction processing?
Deadlocks occur when two or more transactions are waiting indefinitely for resources held by each other, resulting in a stalemate. This situation prevents any of the transactions from progressing. Deadlocks can happen when transactions acquire resources in different orders, creating circular dependencies. Without proper handling, deadlocks can lead to system inefficiencies and delays.
How can deadlocks be prevented in transaction processing?
Deadlocks can be prevented through various techniques. One approach is using deadlock detection algorithms, which identify circular dependencies among transactions and take appropriate actions to break the deadlock. Another method is implementing deadlock prevention techniques, such as resource allocation strategies, to ensure that potential deadlocks are avoided by careful resource management and allocation.