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Questions and Answers
Which of the following is NOT a desirable property of transactions?
What is a transaction in the context of database processing?
Which of the following is an example of a transaction?
What are the two types of schedules used to characterize transactions?
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In SQL, what does a transaction support?
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Study Notes
Properties of Transactions
- Durability ensures that once a transaction is committed, it remains in effect even in case of system failures.
- Atomicity guarantees that all operations in a transaction are completed successfully; if not, the transaction is aborted.
- Isolation provides that transactions execute independently, ensuring the intermediate state is not visible to other transactions.
- Consistency ensures the database transitions from one valid state to another, maintaining data integrity.
Definition of a Transaction
- A transaction in database processing refers to a sequence of operations performed as a single logical unit of work.
- It typically includes database read and write operations.
Example of a Transaction
- An example of a transaction could be transferring funds from one bank account to another, including debiting one account and crediting the other.
Types of Schedules
- Serializable schedules guarantee that the outcome of the transaction execution is the same as if the transactions were executed serially.
- Concurrent schedules allow multiple transactions to execute simultaneously while adhering to isolation and atomicity principles.
SQL Support for Transactions
- SQL supports transactions through commands such as BEGIN TRANSACTION, COMMIT, and ROLLBACK.
- These commands allow users to control transaction boundaries, ensuring data integrity and consistency in database operations.
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Description
Test your knowledge on transaction processing concepts and theory with this quiz. Explore topics such as transaction and system concepts, desirable properties of transactions, characterizing schedules based on recoverability and serializability, and transaction support in SQL.
