Simple .NET/ASP.NET PDF document editor web control SDK

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 two-task) 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.

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In 2, Architecture Overview, we saw how these dedicated servers are spawned or created by the Oracle listener process. I 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.

Since the method has one argument, we also need to use SelectParameters to specify what value should be passed as an argument to our function We want to take the argument from the URL query string so we can use QueryStringParameter provided by ASPNET It has several attributes; the most important are QueryStringField, which sets the name of the argument in the URL address (id in our example), and Name, which has to match the parameter name of the GetProducts function in our F# module We looked only at the ASPNET page for displaying the products in a specified category, but to make the application complete, we also need a page that will list all the categories using the GetCategories function To do this, you simply need to create a page similar to Categoryaspx and modify a few details, so we do not show it here.

The goal of REPEATABLE READ is to provide an isolation level that gives consistent, correct answers and prevents lost updates. We ll take a look at examples of both, see what we have to do in Oracle to achieve these goals, and examine what happens in other systems.

As the last step, Listing 14-9 shows the web configuration file Listing 14-9 webconfig: Configuration of the Sample Database Viewing Application < xml version="10" > <configuration> <connectionStrings> <!-- Connection string for the Northwind database --> <add name="NorthwindData" providerName="SystemDataSqlClient" connectionString=". database connection string ." /> </connectionStrings> <systemweb> <compilation><assemblies> <!-- Referenced NET 35 assemblies required by F# Linq --> <add assembly="SystemCore, Version=3500, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> <add assembly="SystemDataLinq, Version=3500, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> <add assembly="SystemXmlLinq, Version=3500, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> </assemblies></compilation> </systemweb> <systemcodedom> <compilers> <compiler language="F#;f#;fs;fsharp" extension="fs" type="MicrosoftFSharpCompilerCodeDomFSharpAspNetCodeProvider,.

If we have a REPEATABLE READ isolation, the results from a given query must be consistent with respect to some point in time. Most databases (not Oracle) achieve repeatable reads via the use of row-level shared read locks. A shared read lock prevents other sessions from modifying data that we have read. This, of course, decreases concurrency. Oracle opted for the more concurrent, multi-versioning model to provide read-consistent answers. In Oracle, using multi-versioning, we get an answer that is consistent with respect to the point in time the query began execution. In other databases, using shared read locks, we get an answer that is consistent with respect to the point in time the query completes that is, when we can get the answer at all (more on this in a moment). In a system that employs a shared read lock to provide repeatable reads, we would observe rows in a table getting locked as the query processed them. So, using the earlier example, as our query reads the ACCOUNTS table, it would leave shared read locks on each row, as shown in Table 7-5.

Reads row 1. Sum=$500.00 so far. Block 1 has a shared read lock on it. Reads row 2. Sum=$740.25 so far. Block 2 has a shared read lock on it. --