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Which of the following is NOT a database operation that forms a transaction?
Which of the following is NOT a database operation that forms a transaction?
- Deletion
- Join (correct)
- Update
- Insertion
Where can the database operations forming a transaction be specified?
Where can the database operations forming a transaction be specified?
- Both within an application program and interactively via a high-level query language (correct)
- Only interactively via a high-level query language
- Only within an application program
- Through direct manipulation of the database
What is a transaction in the context of database processing?
What is a transaction in the context of database processing?
- A logical unit of database processing that includes one or more database access operations (correct)
- A physical unit of work on the database
- A set of unrelated database operations
- A singular database access operation
In the context of database processing, what is the purpose of specifying explicit begin transaction and end transaction statements in an application program?
In the context of database processing, what is the purpose of specifying explicit begin transaction and end transaction statements in an application program?
How are database access operations between explicit begin transaction and end transaction statements considered?
How are database access operations between explicit begin transaction and end transaction statements considered?
Can a single application program contain more than one transaction if it contains several transaction boundaries?
Can a single application program contain more than one transaction if it contains several transaction boundaries?
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Study Notes
Database Transactions
- A transaction in database processing is a sequence of operations that are treated as a single unit. It ensures data integrity and consistency.
- Common database operations that form a transaction include INSERT, UPDATE, DELETE, and SELECT. Operations not typically included may be trivial tasks that do not affect data integrity.
Transaction Boundaries
- Explicit BEGIN TRANSACTION and END TRANSACTION statements delineate the start and end of a transaction, allowing for clear definition of transactional boundaries within application programs.
- Operations executed between BEGIN TRANSACTION and END TRANSACTION statements are considered part of that transaction. These operations are subject to the ACID properties (Atomicity, Consistency, Isolation, Durability).
Multiple Transactions
- A single application program can contain multiple transactions, each defined by separate transaction boundaries. This allows for complex operations while maintaining logical separation and data integrity throughout the program.
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