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

Figure 14-1 shows the simple web application from Listing 14-2 accessed via a web browser on the local machine. You can deploy and run simple web application like this in three ways. You can simply create an ASP.NET project inside Visual Studio, add the Time.aspx file to the project, and adjust the web.config file in the project to contain the given compiler entry. Visual Studio comes with its own built-in web server so that when you run the web application using F5 from inside Visual Studio, a browser is automatically opened with a reference to this web server. You can also deploy the application to your local web server. For example, simply copy Time.aspx and web.config to an application directory in an ASP.NET-enabled web server. When using IIS, you can copy them to a directory c:\inetpub\wwwroot\Time and reference the website via http://localhost/Time/Time.aspx. Ensure your web server is ASP.NETenabled as described later in the sidebar Serving ASP.NET Pages Locally. Finally, you can deploy the files to a live web server. Again, copy Time.aspx and web.config to an application directory in an ASP.NET-enabled web server. Ensure the F# compiler has been installed on the web server, or deploy the F# compiler as part of the bin directory of your web application.

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prevent read access to information. As this processing is somewhat rare and exceptional (the problem applies only to queries that start between the prepare and the commit phases and try to read the data before the commit arrives), I will not cover it in detail.

Oracle s multi-versioning model for read consistency is applied by default at the statement level (for each and every query) and can also be applied at the transaction level. This means that each and every SQL statement submitted to the database sees a read-consistent view of the database, at least and if you would like this read-consistent view of the database to be at the level of a transaction (a set of SQL statements), you may do that as well, as we ll see in the Serializable section in this chapter. The basic purpose of a transaction in the database is to take the database from one consistent state to the next. The ISO SQL standard specifies various transaction isolation levels, which define how sensitive one transaction is to changes made by another. The greater the level of sensitivity, the greater the degree of isolation the database must provide between transactions executed by your application. In the following section, we ll look at how, via its multi-versioning architecture and with absolutely minimal locking, Oracle can support each of the defined isolation levels.

Figure 14-1. The simple web application from Listing 14-1

get trained in the database and, basically, that they shouldn t have to know anything about the database Why Well, more than once I ve heard .. but Oracle is the most scalable database in the world, my people don t have to learn about it, it ll just work That s true; Oracle is the most scalable database in the world However, I can write bad code that does not scale in Oracle as easily if not more easily as I can write good, scalable code in Oracle You can replace Oracle with any piece of software and the same is true This is a fact: it is easier to write applications that perform poorly than it is to write applications that perform well It is sometimes too easy to build a single-user system in the world s most scalable database if you don t know what you are doing.

The database is a tool and the improper use of any tool can lead to disaster Would you take a nutcracker and smash walnuts with it as if it were a hammer You could, but it wouldn t be a proper use of that tool and the result would be a mess (and probably some seriously hurt fingers) Similar effects can be achieved by remaining ignorant of your database I was called into a project that was in trouble The developers were experiencing massive performance issues it seemed their system was serializing many transactions, that is so instead of many people working concurrently, everyone was getting into a really long line and waiting for everyone in front of them to complete The application architects walked me through the architecture of their system the classic 3-tier approach.