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; This happens to work perfectly in 8i, with the optimizer producing the following plan: Execution Plan (8.1.7.4) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=103 Card=1812 Bytes=45300) 1 0 FILTER 2 1 HASH JOIN (Cost=103 Card=1812 Bytes=45300) 3 2 TABLE ACCESS (FULL) OF 'T1' (Cost=51 Card=1000 Bytes=16000) 4 3 TABLE ACCESS (BY INDEX ROWID) OF 'T2' (Cost=2 Card=1 Bytes=8) 5 4 INDEX (UNIQUE SCAN) OF 'T2_PK' (UNIQUE) (Cost=1 Card=1) 6 2 TABLE ACCESS (FULL) OF 'T3' (Cost=51 Card=1000 Bytes=9000) 7 1 TABLE ACCESS (BY INDEX ROWID) OF 'T4' (Cost=2 Card=1 Bytes=8) 8 7 INDEX (UNIQUE SCAN) OF 'T4_PK' (UNIQUE) (Cost=1 Card=1) Unfortunately, when you upgrade to 9i, the optimizer still obeys your hints and you haven t put enough of them into the SQL to deal with the new, improved options that 9i uses. Remember that query transformation takes place before the other stages of optimization. The optimizer will unnest the two subqueries in your original statement. Unfortunately, subquery unnesting seems to take place from the bottom up, and the resulting inline views are inserted from the top down in your from clause. This means the table order in the transformed query is now t4, t2, t1, t3 and then there s that ordered hint to apply! (The push_subq hint is ignored, because after 9i has finished its transformation, there are no outstanding subqueries to push.) So the new execution plan thanks to your hinting is as follows:

It is possible that your portal will supply a portlet for displaying RSS streams, but failing that, a number of third-party portlets already exist that provide this service. We will discuss a portlet available from the Portlet Open Source Trading (POST) site at http://portlet-opensrc.sourceforge.net/.

3. Enter the query as shown in Figure 3-3, then click Execute (or press F5, or select Query Execute).

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In today s mid- to large-scale enterprises, you will normally encounter a heterogeneous combination of different platforms, frameworks, and programming languages. It is not uncommon to find that a bunch of tools have been implemented: Active Server Pages (ASP), Java Server Pages (JSP), PHP or ColdFusion for Web applications, Visual Basic or Java for in-house applications, , C++ for server-side batch jobs, scripting languages for customizing CRM systems, and so on. Integrating these systems can be a daunting task for system architects. Remoting architectures like CORBA, SOAP and .NET Remoting are an absolute necessity in large-scale enterprise , application integration. (CORBA and SOAP are introduced and compared later in this chapter.)

In this chapter we discussed in detail methods to provide security to your data in the form of encryption. As we have learned, OS X ships with a number of encryption technologies that can be used to increase the security of a running client: the Keychain for encrypting passwords and secure notes, disk images for encrypting a subset of file system data, and FileVault can be used to encrypt the entirety of a user s home directory. While these technologies do provide a decently strong method for securing data, the protections they offer are not always enough, and additional functionality or protection may be needed. In these cases, multiple third party solutions abound that cover a wide variety of data security needs. Determining the appropriate technology to use in your environment will depend on your needs and policies, but the diversity of the options available will typically ensure that OS X can exist in your environment and adhere to your defined security policy.

if (softwareVersion >= requiredVersion) { callFutureAPI(); }

The WelcomeScreen preference is read-only, and the PreferredDatabases preference is populated with several values. You will need to determine which settings should be portlet-wide configuration settings and which should be user-configurable. In this case, it is conceivable that we could implement an advanced welcome screen in the future, and then provide a way for users to switch themselves. We also present users with a set of preferred databases as a set of defaults that can be updated by each user.

The XSLT standard provides the <xsl:if> element that is equivalent to the if statement provided by many programming languages. Suppose that you wish to display details only where the first name is Nancy. You can achieve this by using <xsl:if> as shown in Listing 6-5. Listing 6-5. Using <xsl:if> < xml version="1.0" encoding="UTF-8" > <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:template match="/"> <html> <body> <h1>Employee Listing</h1> <table border="1"> <tr> <th>Employee ID</th> <th>First Name</th> <th>Last Name</th> <th>Home Phone</th> <th>Notes</th> </tr> <xsl:for-each select="employees/employee"> <xsl:if test="firstname[text()='Nancy']"> <tr> <td> <xsl:value-of select="@employeeid"/> </td> <td> <xsl:value-of select="firstname"/> </td>

With each incoming request, the server outputs its current Windows identity (which is the identity of the host process), and afterwards the identity of the managed thread, which is the identity passed from the client to the server. Without impersonating, the process would access external resources like files or a database through the process identity, which means that access control is verified against the process identity, too. If the server impersonates the client, then the identity will be applied to the unmanaged thread, which means that each access to external resources happens with the client s identity. Therefore, in the case of file system ACLs or in the case of the database, logins must be configured to permit access for the client s identity.

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