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Questions and Answers
What is a transaction in a DBMS?
What is a transaction in a DBMS?
Which type of system requires high availability and fast response time?
Which type of system requires high availability and fast response time?
In which type of DBMS can many users access the system concurrently?
In which type of DBMS can many users access the system concurrently?
What does multiprogramming allow the operating system to do?
What does multiprogramming allow the operating system to do?
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Which type of processing involves executing commands from one process, then suspending that process and executing commands from another process?
Which type of processing involves executing commands from one process, then suspending that process and executing commands from another process?
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What does parallel processing involve?
What does parallel processing involve?
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What do you call an executing program that forms a logical unit of database processing?
What do you call an executing program that forms a logical unit of database processing?
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Which statement specifies the boundaries of a transaction?
Which statement specifies the boundaries of a transaction?
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What is the size of a data item called?
What is the size of a data item called?
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What operation reads a database item named X into a program variable named X?
What operation reads a database item named X into a program variable named X?
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Which operation writes the value of program variable X into the database item named X?
Which operation writes the value of program variable X into the database item named X?
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What is the set of all items read by a transaction called?
What is the set of all items read by a transaction called?
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When does a transaction enter into an active state?
When does a transaction enter into an active state?
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What state does a transaction go into after the end of a transaction?
What state does a transaction go into after the end of a transaction?
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When is a transaction considered failed?
When is a transaction considered failed?
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What must the system keep track of during a transaction?
What must the system keep track of during a transaction?
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In a multiprogramming system, what does the operating system do?
In a multiprogramming system, what does the operating system do?
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What is the primary requirement of transaction processing systems with large databases and hundreds of concurrent users?
What is the primary requirement of transaction processing systems with large databases and hundreds of concurrent users?
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What is the distinguishing feature of a single-user DBMS?
What is the distinguishing feature of a single-user DBMS?
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What does a transaction in a DBMS entail?
What does a transaction in a DBMS entail?
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What is the purpose of parallel processing in a transaction processing system?
What is the purpose of parallel processing in a transaction processing system?
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Which type of DBMS allows many users to access the system (database) concurrently?
Which type of DBMS allows many users to access the system (database) concurrently?
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What is the primary purpose of the BEGIN_TRANSACTION statement in a transaction processing system?
What is the primary purpose of the BEGIN_TRANSACTION statement in a transaction processing system?
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In a transaction processing system, what does the READ or WRITE operation signify?
In a transaction processing system, what does the READ or WRITE operation signify?
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Which state does a transaction enter when it has already completed its execution successfully and all of its changes are recorded to the database permanently?
Which state does a transaction enter when it has already completed its execution successfully and all of its changes are recorded to the database permanently?
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What occurs when a transaction is aborted while it is in the active state or if any checks fail?
What occurs when a transaction is aborted while it is in the active state or if any checks fail?
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In a transaction processing system, what is the set of all items written by a transaction referred to as?
In a transaction processing system, what is the set of all items written by a transaction referred to as?
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What does the ROLLBACK (or ABORT) statement signify in a transaction processing system?
What does the ROLLBACK (or ABORT) statement signify in a transaction processing system?
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When does a transaction reach the Terminated State in a transaction processing system?
When does a transaction reach the Terminated State in a transaction processing system?
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In a database system, what is the size of a data item called?
In a database system, what is the size of a data item called?
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Which statement specifies the boundaries of a transaction in a database system?
Which statement specifies the boundaries of a transaction in a database system?
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What does the BEGIN_TRANSACTION statement signify in a database system?
What does the BEGIN_TRANSACTION statement signify in a database system?
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Study Notes
Database Management System (DBMS)
- A transaction in a DBMS is an executing program that forms a logical unit of database processing.
- It entails a series of operations, including reading, writing, and committing or rolling back changes.
Transaction Processing Systems
- High availability and fast response time are required in transaction processing systems.
- These systems involve executing multiple transactions concurrently, with many users accessing the system simultaneously.
- The primary requirement of transaction processing systems is to handle large databases and hundreds of concurrent users.
Multiprogramming and Parallel Processing
- Multiprogramming allows the operating system to interleave the execution of multiple programs.
- It enables the operating system to switch between processes, executing commands from one process, then suspending it and executing commands from another.
- Parallel processing involves executing multiple tasks simultaneously, improving the overall processing speed.
Transaction States
- A transaction enters into an active state when it begins execution.
- When a transaction completes its execution successfully, it enters the Committed State.
- If a transaction fails or aborts, it enters the Aborted State.
- A transaction reaches the Terminated State when it has completed its execution, either successfully or unsuccessfully.
Transaction Operations
- The BEGIN TRANSACTION statement specifies the boundaries of a transaction.
- The READ operation reads a database item into a program variable.
- The WRITE operation writes the value of a program variable into the database item.
- The COMMIT statement signifies the successful completion of a transaction, recording its changes to the database permanently.
- The ROLLBACK (or ABORT) statement signifies the failure of a transaction, reverting its changes.
Database Items
- The size of a data item is called its granularity.
- The set of all items read by a transaction is called its read set.
- The set of all items written by a transaction is called its write set.
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Description
Test your knowledge of transaction processing concepts and theory, as outlined in Chapter 20 of the 'Fundamentals of Database Systems' Seventh Edition. Understand the importance of transactions, their components, and their role in ensuring data integrity and consistency.
