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The SQL Server Database Engine provides: Applications control transactions mainly by specifying when a transaction starts and ends.This can be specified by using either Transact-SQL statements or database application programming interface (API) functions.Delayed durable transactions commit before the transaction log record is persisted to disk.For more information on delayed transaction durability see the topic Transaction Durability.
For more information, see Transactions, Transactions in ODBC and Transactions in SQL Server Native Client (OLEDB).
Atomicity A transaction must be an atomic unit of work; either all of its data modifications are performed, or none of them are performed.
Consistency When completed, a transaction must leave all data in a consistent state.
A transaction is a sequence of operations performed as a single logical unit of work.
A logical unit of work must exhibit four properties, called the atomicity, consistency, isolation, and durability (ACID) properties, to qualify as a transaction.
The programmer includes these modification statements in a single transaction so that the SQL Server Database Engine can enforce the physical integrity of the transaction.