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Question 37/82
You are designing a stored procedure for a database named DB1.
The following requirements must be met during the entire execution of the stored procedure:
The stored procedure must only read changes that are persisted to the database.
SELECTstatements within the stored procedure should only show changes to the data that are made
by the stored procedure.
You need to configure the transaction isolation level for the stored procedure.
Which Transact-SQL statement or statements should you run?
The following requirements must be met during the entire execution of the stored procedure:
The stored procedure must only read changes that are persisted to the database.
SELECTstatements within the stored procedure should only show changes to the data that are made
by the stored procedure.
You need to configure the transaction isolation level for the stored procedure.
Which Transact-SQL statement or statements should you run?
Correct Answer: B
Explanation/Reference:
Explanation:
READ COMMITTED specifies that statements cannot read data that has been modified but not committed by other transactions. This prevents dirty reads. Data can be changed by other transactions between individual statements within the current transaction, resulting in nonrepeatable reads or phantom data. This option is the SQL Server default.
Incorrect Answers:
A, D: READ UNCOMMITTED specifies that statements can read rows that have been modified by other transactions but not yet committed.
References: https://docs.microsoft.com/en-us/dotnet/framework/data/adonet/sql/snapshot-isolation-in-sql- server
Explanation:
READ COMMITTED specifies that statements cannot read data that has been modified but not committed by other transactions. This prevents dirty reads. Data can be changed by other transactions between individual statements within the current transaction, resulting in nonrepeatable reads or phantom data. This option is the SQL Server default.
Incorrect Answers:
A, D: READ UNCOMMITTED specifies that statements can read rows that have been modified by other transactions but not yet committed.
References: https://docs.microsoft.com/en-us/dotnet/framework/data/adonet/sql/snapshot-isolation-in-sql- server
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