Implicit Transactions
AutoCommit transactions and explicit user-defined transactions, which are the default transaction mode in SQL Server 2012, are not ANSI-92 SQL-compliant. The ANSI-92 SQL standard states that any data retrieval or modification statement issued should implicitly begin a multistatement transaction that remains in effect until an explicit ROLLBACK or COMMIT statement is issued. Microsoft refers to this transaction mode as IMPLICIT_TRANSACTIONS.
To enable implicit transactions for a connection in SQL Server 2012, you need to enable the IMPLICIT_TRANSACTIONS session setting using the following command:
SET IMPLICIT_TRANSACTIONS ON
After this option is turned on, transactions are implicitly started, if they are not already in progress, ...
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