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Oracle takes an optimistic approach to serialization it gambles on the fact that the data your transaction wants to update won t be updated by any other transaction This is typically the way it happens, and usually the gamble pays off, especially in quick-transaction, OLTPtype systems If no one else updates your data during your transaction, this isolation level, which will generally decrease concurrency in other systems, will provide the same degree of concurrency as it would without SERIALIZABLE transactions The downside to this is that you may get the ORA-08177 error if the gamble doesn t pay off If you think about it, however, it s worth the risk If you re using a SERIALIZABLE transaction, you shouldn t expect to update the same information as other transactions If you do, you should use the SELECT .. FOR UPDATE as described previously in 1, and this will serialize the access.

The final bit of code in SmartDate exists to help simplify data access. This is done by implementing a method that allows a SmartDate value to be converted to a format suitable for writing to the database. Though SmartDate already has methods to convert a date to text and text to a date, it doesn t have any good way of getting a date formatted properly to write to a database. Specifically, it needs a way to either write a valid date or write a null value if the date is empty. In ADO.NET, a null value is usually expressed as DBNull.Value, so it is possible to implement a method that returns either a valid DateTime object or DBNull.Value: Public ReadOnly Property DBValue() As Object Get If Me.IsEmpty Then Return DBNull.Value Else Return Me.Date End If End Get End Property Since SmartDate already implements an IsEmpty() property, the code here is pretty straightforward. If the value is empty, DBNull.Value is returned, which can be used to put a null value into a database via ADO.NET. Otherwise, a valid date value is returned. At this point, you ve seen the implementation of the core SmartDate functionality. While using SmartDate is certainly optional, it does offer business developers an easy way to handle dates that must be represented as text, and to support the concept of an empty date. Later in the chapter, the SafeDataReader will also include some data access functionality to make it easy to save and restore a SmartDate from a database. This same approach can be used to make other data types smart if you so desire. Even with the Nullable(Of T) support from the .NET Framework, dealing with empty values often requires extra coding, which is often most efficiently placed in a framework class like SmartDate.

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So, using an isolation level of SERIALIZABLE will be achievable and effective if you Have a high probability of no one else modifying the same data Need transaction-level read consistency Will be doing short transactions (to help make the first bullet point a reality) Oracle finds this method scalable enough to run all of their TPC-Cs (an industry standard OLTP benchmark; see wwwtpcorg for details) In many other implementations, you will find this being achieved with shared read locks and their corresponding deadlocks, and blocking Here in Oracle, we do not get any blocking, but we will get the ORA-08177 error if other sessions change the data we want to change as well However, we will not get the error as frequently as we will get deadlocks and blocks in the other systems.

If you d like to learn more about using sockets to manage client and server connections, check out these resources: TCP/IP Sockets in C# by David Makofske, Michael J. Donahoo, and Kenneth L. Calvert (Morgan Kaufmann Publishers, 2004) Professional .NET Network Programming by Andrew Krowczyk, Vinod Kumar, and Nauman Laghari (Wrox Press, 2002) Network Programming in .NET by Fiach Reid (Digital Press, 2004)

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