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Both dedicated and shared server processes have the same job: they process all of the SQL you give to them. When you submit a SELECT * FROM EMP query to the database, an Oracle dedicated/shared server process parses the query and places it into the Shared pool (or finds it in the Shared pool already, hopefully). This process comes up with the query plan, if necessary, and executes the query plan, perhaps finding the necessary data in the buffer cache or reading the data from disk into the buffer cache. These server processes are the workhorse processes. Many times, you will find these processes to be the highest consumers of CPU time on your system, as they are the ones that do your sorting, your summing, your joining pretty much everything.

The NameValuePair class defines the child objects to be contained in the collection: each of which contains a name (key) and value. It is defined as a nested class inside the NameValueListBase class: <Serializable()> _ Public Class NameValuePair Private mKey As K Private mValue As V Public ReadOnly Property Key() As K Get Return mKey End Get End Property

In dedicated server mode, there will be a one-to-one mapping between a client connection and a server process (or thread, as the case may be). If you have 100 dedicated server connections on a UNIX machine, there will be 100 processes executing on their behalf. Graphically it looks as shown in Figure 5-1.

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Public Property Value() As V Get Return mValue End Get Set(ByVal value As V) mValue = value End Set End Property Public Sub New(ByVal key As K, ByVal value As V) mKey = key mValue = value End Sub End Class Because it is nested inside NameValueListBase, it has access to the K and V generic type parameters. These type parameters are used to define the types of the key and value items stored in each child object. Thanks to the code in the Csla.Core.ReadOnlyBindingList and in the .NET BindingList base classes, all the hard work is already done. The NameValueListBase is now a fully functioning read-only collection of name/value data. It even supports data binding to Windows Forms and Web Forms.

Figure 5-1. Typical dedicated server connection Your client application will have Oracle libraries linked into it. These libraries provide the APIs you need in order to talk to the database. These APIs know how to submit a query to the database and process the cursor that is returned. They know how to bundle your requests into network calls that the dedicated server will know how to unbundle. This piece of software is called Oracle Net, although in prior releases you might have known it as SQL*Net or Net8. This is the networking software/protocol that Oracle employs to allow for client/server processing (even in an n-tier architecture, there is a client/server program lurking). Oracle employs this same architecture even if Oracle Net is not technically involved in the picture. That is, even when the client and server are on the same machine this two-process (also known as twotask) architecture is still employed. This architecture provides two benefits: Remote execution: It is very natural for the client application to be executing on a machine other than the database itself. Address space isolation: The server process has read-write access to the SGA. An errant pointer in a client process could easily corrupt data structures in the SGA if the client process and server process were physically linked together. In 2, we saw how these dedicated servers are spawned or created by the Oracle listener process. We won t cover that process again; rather, we ll quickly look at what happens when the listener isn t involved. The mechanism is much the same as it was with the listener, but instead of the listener creating the dedicated server via a fork()/exec() in UNIX or an interprocess communication (IPC) call in Windows, the client process itself creates it.

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