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Questions and Answers
Which of the following is NOT a desirable property of transactions?
Which of the following is NOT a desirable property of transactions?
- Consistency
- Isolation
- Durability (correct)
- Atomicity
What is a transaction in the context of database processing?
What is a transaction in the context of database processing?
- A distinct execution of a program
- A program that includes database modification operations
- A program that includes database retrieval operations
- A logical unit of database processing (correct)
Which of the following is an example of a transaction?
Which of the following is an example of a transaction?
- Executing a SQL SELECT statement
- Executing a program with different parameters
- Retrieving data from a database
- Modifying a database using SQL INSERT (correct)
What are the two types of schedules used to characterize transactions?
What are the two types of schedules used to characterize transactions?
In SQL, what does a transaction support?
In SQL, what does a transaction support?
Flashcards
Durability
Durability
A property that ensures completed transactions are permanently recorded.
Transaction (Database)
Transaction (Database)
A logical unit of database processing involving one or more operations.
Example of a transaction
Example of a transaction
Modifying a database using SQL commands such as INSERT.
Types of schedules
Types of schedules
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Transaction support in SQL
Transaction support in SQL
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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.
