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The I in ACID stands for isolation. Isolation means that the effects of each transaction are the same as if the transaction was the only one in the system; in other words, modifications made by a concurrent transaction must be isolated from the modifications made by any other concurrent transaction. In this way, a transaction will not be affected by a value that has been changed by another transaction until the change is committed. A transaction either recognizes data in the state it was in before another concurrent transaction modified the data, or it recognizes the data after the second transaction has completed; however, it does not recognize the data in an intermediate state. This is referred to as serializable isolation because it results in the ability to have a common starting set of data reloaded and to replay a series of transactions to end up with the data in the same state no matter how many times it is performed. If a transaction fails, its modifications will have no effect because the changes will be rolled back. SQL Server enables you to adjust the isolation level of your transactions according to what is acceptable for business needs; serializable is not the only option. A transaction s isolation behavior depends on the isolation level you specify. Levels of isolation are covered in more detail in a later section.

The last ACID property is durability. Durability means that once a transaction is committed, the effects of the transaction remain permanently in the database, even in the event of a system failure. The SQL Server transaction log and your database backups provide durability. If SQL Server, the operating system, or a component of the server fails, the database will automatically recover when SQL Server is restarted. SQL Server uses the transaction log to replay the committed transactions that were affected by the system crash and to roll back any uncommitted transactions. If a data drive fails and data is lost or corrupted, you can recover the database by using data backups and transaction log backups. Proper recovery planning is essential in any database system. With proper backups, you should always be able to recover from a failure. Unfortunately, if your backup drives fail and you lose the backup that is needed to recover the system, you might not be able to recover your database. See 14 and 15, Restoring Data, for details about backing up and restoring your database and transaction logs.

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Now that you understand the properties of a valid transaction, let s look at the mechanisms SQL Server provides to manage transactions with both the default SQL Server behavior and via programmable transaction management. The key to transactions is the commit process. Committing transactions in essence, committing the data changes made by transactions is an integral part of data integrity, locking, and consistency. A commit is an operation that conceptually saves all changes to the database made since the start of a transaction. A commit guarantees that all of the transaction s modifications, first written to the buffer cache in memory, will be permanent in the database. When a transaction is committed, it means any changed records are written to the log file and, eventually also written to the data files (if not already). If the changes were not yet written to the data files at the point of the commit, then the changes will be written when the SQL Server background processes, such as the lazy writer or checkpoint, writes them out. A commit also frees resources such as locks, which are held by a transaction. Starting and ending transactions appropriately to enforce logical consistency of data is the responsibility of the application developer and/or the DBA who writes SQL code or stored procedures. A transaction may need to include multiple data modification statements that must be part of a single unit in order to maintain data integrity and consistency in the database. If one of those statements fails, the other statements must not complete either or the data will be left inconsistent. SQL Server cannot determine on its

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own when a logical unit of work should begin or end only a developer who knows the business logic can determine that but SQL Server does provide the mechanisms needed to manage transactions.

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