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SQL Server 2005 Introduces SNAPSHOT Isolation Level Data Reading

SQL Server 2005 Introduces SNAPSHOT Isolation Level Data Reading

The 2005 release of SQL Server will contain a new type of isolation level called SNAPSHOT. This level stands midway between READ COMMITTED and READ UNCOMMITTED, the two isolation levels available now.  The major benefit of SNAPSHOT, is that it provides a transaction view of data that is consistent with the value of the data when the transaction began, without being blocked by any other transaction.

 

With SQL's current capabilities, the value of data which is being worked with is never guaranteed to be the absolute value.  With the READ COMMITTED isolation level, transactions are restricted to working with data that has already been committed. In this manner, the data that is being worked with takes on exclusive ownership with the current read operation. Another read operation executed on that data, or a value dependent on the data in question, is effectively blocked.

 

Using READ UNCOMMITTED a transaction can read only the uncommitted data in use by another operation. The value is not stable, however, because the data that is being worked with has yet to be committed.

 

SNAPSHOT isolation will allow a user to view data in the state it was when the transaction began; without being blocked by any other transactions. In this way, a user's view of whatever data is being viewed, in consistent with the value the data had when first entering the transaction. SQL Server 2005 will come equipped with this feature, along with a timestamp feature that will enable a history to be kept of database changes.

 

 

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.NETDJ News Desk monitors Microsoft .NET and its related technologies, including Silverlight, to present IT professionals with news, updates on technology advances, business trends, new products and standards, and insight.

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