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What is a transaction in the context of DBMS?
What is a transaction in the context of DBMS?
- A group of tasks used for performing logical work and cannot be further divided (correct)
- A single operation that reads or writes data from the database
- A series of complex operations involving multiple databases
- A set of operations that can be divided into smaller units
What is the purpose of the Read(X) operation in a transaction?
What is the purpose of the Read(X) operation in a transaction?
- To delete the value of X from the database
- To read the value of X from the database and store it in a buffer in main memory (correct)
- To update the value of X in the database
- To create a new entry for X in the database
What does the Write(X) operation do in a transaction?
What does the Write(X) operation do in a transaction?
- Writes the value to a temporary file
- Writes the value back to the database from the buffer (correct)
- Updates the value of X in the buffer
- Deletes the value of X from the buffer
In the given example, what is the result of the operation X = X - 500, if the initial value of X is $4000?
In the given example, what is the result of the operation X = X - 500, if the initial value of X is $4000?
What are the main components of a simple transaction involving bank account operations?
What are the main components of a simple transaction involving bank account operations?
What does a transaction mean in the context of DBMS?
What does a transaction mean in the context of DBMS?
What is the purpose of the Read(X) operation in a transaction?
What is the purpose of the Read(X) operation in a transaction?
Which of the following represents a correct sequence of operations in a simple transaction involving bank account operations?
Which of the following represents a correct sequence of operations in a simple transaction involving bank account operations?
What is the result of the operation $X = X - 500$, if the initial value of $X$ is $4000$?
What is the result of the operation $X = X - 500$, if the initial value of $X$ is $4000$?
What are the main components of a transaction in DBMS?
What are the main components of a transaction in DBMS?
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Study Notes
Transaction in DBMS
- A transaction is a sequence of operations performed as a single logical unit of work within a Database Management System (DBMS).
- Ensures data integrity and consistency by following ACID properties: Atomicity, Consistency, Isolation, Durability.
Operations in Transactions
-
Read(X) Operation:
- Fetches the current value of variable or data item X from the database for processing.
- Essential for verifying or updating values during a transaction.
-
Write(X) Operation:
- Updates the value of variable or data item X in the database.
- Committed changes persist across transactions, ensuring that data remains current.
Example Calculation
- Operation: X = X - 500, with initial value of X = $4000.
- Resulting value of X after operation: $3500.
Components of Simple Transactions
- Main components in bank account transactions include:
- Transaction initiation: Starting the transaction process.
- Read operation: Accessing current balance or data.
- Write operation: Updating the balance after transactions.
- Commitment: Finalizing changes to reflect in the database.
- Rollback mechanism: Reverting to the previous state if an error occurs.
Summary of Transaction Purpose
- Transactions in DBMS ensure that all operations are completed successfully; otherwise, none are applied to maintain consistency and reliability of the database.
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