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persistent class, no matter what the real property name of the identifier is. (Again, this special property isn t standardized in JPA QL.) The next query counts the number of bids and calculates the average bid per unsold item:

Active Directory also includes a replication feature. Replication ensures that changes to a domain controller are reflected in all domain controllers within a domain. To understand replication, you must understand domain controllers. A domain controller stores a replica of the domain directory. Each domain can contain one or more domain controllers. Within a site, Active Directory automatically generates a ring topology for replication among domain controllers in the same domain. The topology defines the path for directory updates to flow from one domain controller to another until all receive the directory updates (see Figure 14-5).

Figure 14-5

select bid.item.id, count(bid), avg(bid.amount) from Bid bid where bid.item.successfulBid is null group by bid.item.id

The ring structure ensures that there are at least two replication paths from one domain controller to another. Therefore, if one domain controller is down temporarily, replication still continues to all other domain controllers. Active Directory periodically analyzes the replication topology within a site to ensure that it is still efficient. If you add or remove a domain controller from the network or a site, Active Directory reconfigures the topology to reflect the change.

At this point, please view the multimedia presentation Replication Within Sites, which is included in the Multimedia folder on the CD accompanying this book.

That query uses an implicit association join. For an explicit ordinary join in the FROM clause (not a fetch join), you can re-express it as follows:

14-12

Gpresult.exe is the latest incarnation of a tool that used to be known as Resultant Set of Policy (RSoP). In fact, RSoP still exists as a snap-in for Microsoft Management Console. If you run Rsop.msc from a computer s Run dialog box or a command prompt, the snap-in appears in a new MMC console. The interface looks almost exactly like that of the Group Policy Management Editor, except that the console contains only the settings applied to the computer. However, for computers running Windows Vista or later, Rsop.msc cannot display all of the settings the system receives through GPOs. For Windows Vista and Windows 7, you must use Gpresult.exe instead.

14

select bidItem.id, count(bid), avg(bid.amount) from Bid bid join bid.item bidItem where bidItem.successfulBid is null group by bidItem.id

Use the following questions to help determine whether you have learned enough to move on to the next lesson. If you have difficulty answering these questions, review the material in this lesson before beginning the next lesson. You can find answers to these questions in the Questions and Answers section at the end of this chapter. 1. In Active Directory, you organize resources in a logical structure. What advantage does this provide

2. A(n) _____________ is a distinct, named set of attributes that represents a network resource. 3. What component do you use to organize objects into logical administrative groups (Choose the correct answer.) a. Site b. Tree c. Domain d. OU 4. A(n) ____________ is a grouping or hierarchical arrangement of one or more ___________________ that form a disjointed namespace. 5. The physical components of Active Directory are ______________________ and ________________.

Sometimes, you want to further restrict the result by selecting only particular values of a group. Restricting groups with having The WHERE clause is used to perform the relational operation of restriction upon rows. The HAVING clause performs restriction upon groups. For example, the next query counts users with each last name that begins with A :

The logical structure of Active Directory is made up of domains, trees, forests, OUs, and objects. The logical structure is separated from the physical structure of the network itself, and does not rely on the physical location of servers or the network connectivity throughout the domain. The major components of the logical structure include the following:

The core unit of logical structure in Active Directory is the domain. All network objects exist within a domain, and each domain stores information only about the objects that it contains.

select user.lastname, count(user) from User user group by user.lastname having user.lastname like 'A%'

Overview of Active Directory 14-13