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Definer rights mode is the default mode in which procedures are created. The majority of your code should use definer rights mode, which has the following advantages: Definer rights mode encourages the use of shared SQL in the shared pool, which leads to better scalability. Recall that all the information that Oracle needs to parse the SQL in a definer rights procedure is available at compile time. For example, if you are logged in as scott and refer to the table emp (e.g., in select * from emp), Oracle knows that you are always going to refer to table emp owned by scott; thus, Oracle can share the same SQL for all users in its shared pool, which results in less parsing and improved scalability. This is not the case if the procedure is written using invoker rights mode. In this case, if you are executing the procedure as scott, you are referring to scott.emp, and if you are executing as blake, you are referring to blake.emp. Moreover, if you change your environment (e.g., set a different role in the same session), Oracle will have to reparse the SQL statement. This can lead to reduced scalability. Definer rights mode enables you to write PL/SQL code that allows end users to manipulate data in tables without having direct access to them. All the users data manipulations go through your PL/SQL code, and as long as your code ensures data integrity, your data is safe.

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The first point of interest is the name attribute. When you re running multiple ASP .NET web applications on a single Web server that each require their own login, you should specify a unique name for the authentication cookie. Conversely, if several applications need to share logins, you can set this name the same across those applications and the authentication ticket will only need to be created once, giving you single sign-in for Forms-based authentication. This value can be any sequence of characters; however, you ll obviously want to provide a meaningful value for the task at hand. For example: <authentication mode="Forms"> <forms loginUrl ="Logon.aspx" name ="WebEntryPoint"/> </authentication>

Raises the given exception Raises the FailureException exception Catches expressions matching the pattern rules Executes the finally expression both when the computation is successful and when an exception is raised A rule matching the given .NET exception type A rule matching the given .NET exception type and naming it as its stronger type A rule matching the given datacarrying F# exception A rule matching any exception, binding the name exn to the exception object value A rule matching the exception under the given condition, binding the name exn to the exception object value

You ll commonly use invoker rights mode when you re writing generic routines, as you saw earlier with the example function count_rows.

Debugging in PL/SQL gets a lot easier when you follow some of the well-known tenets of defensive programming in any programming language. Two of the important tenets are Use good exception handling practices. Instrument your code extensively.

Imperative programming and input/output are closely related topics. In the following sections, we show some very simple I/O techniques using F# and .NET libraries.

Internet Information Server (IIS) is the application server for the Windows platform. This application server has been evolving for the past 10 years, and will continue to evolve into the foreseeable future. IIS has gone from serving static markup to a full-featured application hosting environment. ISAPI applications have been available as a point of extensibility for years. A number of the technologies you ll be looking at in this chapter are implemented as ISAPI applications: ASP .NET, SQLXML, and SOAP exposure of Enterprise Services. Others, such as the COM SOAP stack, are beyond the scope for this book.

This section doesn t go into detail about these practices, which are covered well in many PL/SQL books, including 10 of Connor McDonald s Mastering Oracle PL/SQL (Apress, ISBN: 1-59059-217-4). Instead, we will focus on two related topics: How to print an execution stack trace in PL/SQL How to instrument your PL/SQL and JDBC code using a custom PL/SQL package such that you can see your Java and PL/SQL instrumentation messages in the same database session, in the order in which they were executed