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Database Resident Connection Pooling (DRCP) is an optional, new method of connecting to the database and establishing a session. It is designed as a more efficient method of connection pooling for application interfaces that do not support efficient connection pooling natively such as PHP, a general purpose web scripting language. DRCP is a mixture of dedicated server and shared server concepts. It inherits from shared server the concept of server process pooling, only the processes being pooled will be dedicated servers not shared servers; it inherits from the dedicated server the concept of well being dedicated. In a shared server connection, the shared server process is shared among many sessions and a single session will tend to use many shared servers. With DRCP, this is not true; the dedicated server process that is selected from the pool will become dedicated to the client process for the life of its session. In shared server, if I execute three statements against the database in my session, there is a good chance that the three statements will be executed by three different shared server processes. Using DRCP, those same three statements would be executed by the dedicated server assigned to me from the pool that dedicated server would be mine until my session releases it back to the pool. So DRCP has the pooling capabilities of shared server and the performance characteristics of dedicated server. We ll explore performance of dedicated versus shared server more below.)

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Many great web services are available on the Internet. For instance, Microsoft s TerraService is a free web service at http://terraservice.net that enables you to integrate USGS images and data into your applications. Also, http://webservicex.net is another great source for web services; for instance, its WeatherForecast web service can supply weather information for any given U.S. location. Calling these and other web services in your .NET applications is quite painless using F# web references. All web services are called via generated proxy code. The easiest way to generate this code is by adding a web reference to Visual Studio, which automatically generates a .NET proxy class for the given web service. Figure 14-5 shows the available operations for the web service from http://webservicex.net/WeatherForecast.asmx.

6 / Trigger created. ops$tkyte%ORA11GR2> update t set x = x+1; fired 1 row updated. and go into that second session again and run the update, we observe it gets blocked (of course). After committing the blocking session, we ll see the following: ops$tkyte%ORA11GR2> update t set x = x+1 where y > 0; fired 1 row updated. The trigger fired just once this time, not twice. Thus, the :NEW and :OLD column values, when referenced in the trigger, are also used by Oracle to do the restart checking. When we referenced :NEW.X and :OLD.X in the trigger, X s consistent read and current read values were compared and found to be different. A restart ensued. When we removed the reference to that column from the trigger, there was no restart. So the rule is that the set of columns used in the WHERE clause to find the rows plus the columns referenced in the row triggers will be compared. The consistent read version of the row will be compared to the current read version of the row; if any of them are different, the modification will restart.

FOR EACH ROW trigger is more efficient than using a BEFORE FOR EACH ROW. The AFTER trigger won t have the same effect we ve already retrieved the block in current mode by then.

You can also generate code using the .NET command-line tool wsdl.exe. Here is an example where you generate C# code for TerraService and WeatherForecast and compile it explicitly: C:\fsharp> wsdl /namespace:WebReferences http://webservicex.net/WeatherForecast.asmx Microsoft (R) Web Services Description Language Utility Writing file 'C:\fsharp\WeatherForecast.cs'. C:\fsharp> csc /target:library WeatherForecast.cs C:\fsharp> wsdl /namespace:WebReferences http://terraservice.net/terraservice.asmx Microsoft (R) Web Services Description Language Utility Writing file 'C:\fsharp\TerraService.cs'. C:\fsharp> csc /target:library TerraService.cs C:\fsharp> dir *.dll ... 04/09/2007 00:18 04/09/2007 00:18