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Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options ops$tkyte%ORA11GR2> select a.spid dedicated_server, 2 b.process clientpid 3 from v$process a, v$session b 4 where a.addr = b.paddr 5 and b.sid = (select sid from v$mystat where rownum=1) 6 / DEDICATED_SERVER CLIENTPID ------------------------ -----------------------19168 19167 ops$tkyte%ORA11GR2> ops$tkyte%ORA11GR2> !/bin/ps -fp 19168 UID PID PPID C STIME TTY tkyte 19167 19166 0 07:30 pts/2 ora11gr2 19168 19167 0 07:30 19167 STAT Ss+ Ss

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Here, I used a query to discover the process ID (PID) associated with my dedicated server (the SPID from V$PROCESS is the operating system PID of the process that was being used during the execution of that query). The output of /bin/ps fp includes the parent process id (PPID) and shows the dedicated server process, 19168, is the child of my SQL*Plus process: process id 19167.

Web services can be used to implement service-oriented architectures, a popular application integration strategy where the interacting software components and services are loosely coupled in a distributed environment. The benefits of such integration include allowing offering services as independent entities that can be used and reused from different systems within an organization or even the entire world. Consuming web services thus is a great way to expand the functionality of your application. A web service is a set of functionality that is offered through a platform-independent interface. Applications can explore the pieces of functionality offered by a web service by examining its Web Services Description Language (WSDL) signature. This WSDL definition uses XML to describe the signature of each operation by declaring the data types of the parameters and optional return values. Communicating with a web service occurs via the Simple Object Access Protocol (SOAP), which encodes service invocations and return values in an XML envelope over HTTP. Because web services are invoked over HTTP, they can be used by any application with Internet connectivity. Communicating with web services is usually performed via so-called proxy classes. A proxy performs all the grunge work involved in calling the service and deciphering the results, freeing you from a lot work. A typical workflow when calling a web service is the following:

Let s now take a look at the shared server process in more detail. This type of connection mandates the use of Oracle Net even if the client and server are on the same machine you cannot use shared server without using the Oracle TNS listener. As described earlier, the client application will connect to the Oracle TNS listener and will be redirected or handed off to a dispatcher. The dispatcher acts as the conduit between the client application and the shared server process. Figure 5-2 is a diagram of the architecture of a shared server connection to the database.

Figure 5-2. Typical shared server connection Here, we can see that the client applications, with the Oracle libraries linked in, will be physically connected to a dispatcher process. We may have many dispatchers configured for any given instance, but it is not uncommon to have just one dispatcher for many hundreds even thousands of users. The dispatcher is simply responsible for receiving inbound requests from the client applications and putting them into a request queue in the SGA. The first available shared server process from the pool of precreated shared server processes will pick up the request from the queue and attach the UGA of the associated session (the boxes labeled S in Figure 5-2). The shared server will process that request and place any output from it into the response queue. The dispatcher constantly monitors the response queue for results and transmits them back to the client application. As far as the client is concerned, it can t really tell if it is connected via a dedicated server or a shared connection they appear to be the same. Only at the database level is the difference apparent.

1. The client instantiates the proxy and calls the desired operation on it. 2. The proxy creates a SOAP XML request and sends it to the web service via HTTP. 3. The web service receives the request and performs the requested operation. 4. The web service packages the return value from the operation (or any exception that occurred within) into a SOAP XML response and returns it to the proxy via HTTP. 5. The proxy deserializes the response into a .NET data type and returns it to the calling class.

Database Resident Connection Pooling (DRCP)