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Becoming familiar with the Group Policy objects deployed to the network and the settings they contain is the best way to determine whether a computer problem is the result of a Group Policy issue and where in the Group Policy infrastructure the cause of the problem is located. One of the most fundamental Group Policy issues that can affect Windows 7 performance is the failure of the Group Policy settings to reach the workstation. After creating a GPO, you deploy it by linking the GPO to an AD DS domain, site, or organizational unit (OU) object using the Group Policy Management console. When you right-click an AD DS object in the Group Policy Management console and, in the context menu, activate the Block Inheritance toggle, the object appears with an exclamation point icon. With this feature activated, the object does not inherit any GPO settings from the parent objects above it. The basic rules for GPO application are as follows: GPOs linked to AD DS objects take precedence over local GPOs. GPOs linked to OUs take precedence over GPOs linked to domains and sites. GPOs linked to domains take precedence over GPOs linked to sites. GPOs linked to lower-level OUs take precedence over those linked to higherlevel OUs. When multiple GPOs are linked to a single object, the GPO linked first takes precedence. Gpresult.exe is a command-line program that enables you to view information about the Group Policy settings that apply to a particular client workstation. In other words, you can use this tool to see which GPOs are operating for that computer.

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This chapter explains all query options that you may consider optional or advanced. You ll need the first subject of this chapter, the Criteria query interface, whenever you create more complex queries programmatically. This API is much more convenient and elegant than programmatic generation of query strings for HQL and JPA QL. Unfortunately, it s also only available as a native Hibernate API; Java Persistence doesn t (yet) standardize a programmatic query interface. Both Hibernate and Java Persistence support queries written in native SQL. You can embed SQL and stored procedure calls in your Java source code or externalize them to mapping metadata. Hibernate can execute your SQL and convert the resultset into more convenient objects, depending on your mapping. Filtering of collections is a simple convenience feature of Hibernate you won t use it often. It helps you to replace a more elaborate query with a simple API call and a query fragment, for example, if you want to obtain a subset of the objects in a collection. Finally, we ll discuss the optional query result cache we ve already mentioned that it s not useful in all situations, so we ll take a closer look at the benefits of caching results of a query and when you d ideally enable this feature. Let s start with query by criteria and query by example.

This lesson explains the Welcome screen and the Enter Password dialog box, which are the two options that you use to log on to Windows XP Professional. It also explains how Windows XP Professional authenticates a user during the logon process. This mandatory authentication process ensures that only valid users can gain access to resources and data on a computer or the network.

Log on locally to the computer running Windows XP Professional. Identify how Windows XP Professional authenticates a user when the user logs on to a

The Criteria and Example APIs are available in Hibernate only; Java Persistence doesn t standardize these interfaces. As mentioned earlier, it seems likely that other vendors, not only Hibernate, support a similar extension interface and that a future version of the standard will include this functionality. Querying with programmatically generated criteria and example objects is often the preferred solution when queries get more complex. This is especially true if you have to create a query at runtime. Imagine that you have to implement a search mask in your application, with many check boxes, input fields, and switches the user can enable. You must create a database query from the user s selection. The traditional way to do this is to create a query string through concatenation, or maybe to write a query builder that can construct the SQL query string for you. You d run into the same problem if you d try to use HQL or JPA QL in this scenario. The Criteria and Example interfaces allow you to build queries programmatically by creating and combining objects in the right order. We now show you how