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A transaction starts the first time it accesses data.
A transaction running under SNAPSHOT isolation level can view changes made by that transaction.
Only one of the isolation level options can be set at a time, and it remains set for that connection until it is explicitly changed.
The transaction can only recognize data modifications that were committed before the start of the transaction.I had a requirement wherein I had to fetch 10 random rows from My SQL database and display it on screen.I used following simple query for retrieving random records from database table.The database does not have to be in single-user mode.
REPEATABLE READ Specifies that statements cannot read data that has been modified but not yet committed by other transactions and that no other transactions can modify data that has been read by the current transaction until the current transaction completes.In SQL Server, you can also minimize locking contention while protecting transactions from dirty reads of uncommitted data modifications using either: Note When you set the READ_COMMITTED_SNAPSHOT option, only the connection executing the ALTER DATABASE command is allowed in the database.