If a run-time statement error (such as a constraint violation) occurs in a batch, the default behavior in SQL Server is to roll back only the statement that generated the error. You can change this behavior using the SET XACT_ABORT statement. After SET XACT_ABORT ON is executed, any run-time statement error causes an automatic rollback of the current transaction. Compile errors, such as a syntax error, are not affected by SET XACT_ABORT.
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