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Usually, you would never annotate your properties with this annotation. However, at times you may need to specify the fetch() attribute, which allows you to specify whether a particular property is loaded lazily or eagerly when the persistent object is first fetched from the database. This attribute allows your persistence provider to optimize your access to the database by minimizing the amount of data you load with a query. So, if the fetch() attribute is LAZY, that particular property will not be initialized until you actually access this field. All other mapping annotations have this same attribute. The weird thing about the specification, though, is that the fetch() attribute is just a hint. Even if you mark the property as LAZY for a @Basic type, the persistence provider is still allowed to load the property eagerly. This is due to the fact that this feature requires class-level instrumentation. It should also be noted that lazy loading is neither really useful nor a significant performance optimization for standard, small objects, as loading these later requires the overhead of more SQL queries. It is best practice to eagerly load basic properties, and lazily load ones that may be large and infrequently accessed. The optional() attribute is useful for when the persistence provider is generating the database schema for you. When this attribute is set to true, the property is treated as nullable. Assuming employees may have a picture associated with their record, we probably don t need this picture all the time. We may lazily load it and allow the property to be nullable:

available for use after normal network traffic is handled) of 128 Kbps and higher is suf ficient for a site. With Active Directory, sites are not part of the namespace. When you browse the log ical namespace, you see computers and users grouped into domains and OUs, not sites. Sites contain only computer objects and connection objects used to configure replication between sites. As shown in Figure 1-8, a single domain can span one or more geographical sites, and a single site can include user accounts and computers belonging to multiple domains.

As an administrator, you must create a site structure to reflect your company s organi zation. See Lesson 3, Planning the Active Directory Infrastructure Design, to learn the basics of site design. See 5, Configuring Sites and Managing Replication, for details about configuring sites.

User accounts in a Windows NT 4.0 domain or a Windows Mixed domain functional mode domain can be configured only for the Allow, Deny, and Allow Callback options.

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/** * Picture of the employee used in ID cards. */ @Lob // Note that this is a binary large object @Basic(fetch = FetchType.LAZY, optional = true) // Don't load this by default; it's an expensive operation. // Only load when requested. private byte[] image;

Sometimes you ll have a need to ignore dial-in properties. You might need to do this because clients such as those using an authenticating switch or wireless connection might not understand some parts of the dial-in user account properties and therefore would disconnect a legitimate session. You can configure a remote access policy to ignore the dial-in properties by configuring the IgnoreUser-Dialin-Properties attribute of the Advanced tab of the profile settings of the remote access policy. You can even choose to apply this condition for some types of connections and not for others. By setting the attribute to false, you allow dialin to be used; by setting the attribute to true, you prevent dial-in from being used. A good example of such a use is to create two remote access policies one for wired connections, and one for wireless. If authorized remote access user Kevin F. Browne uses a wired connection, the properties of his user account dial-in page are considered. When he uses a wireless connection, they are not.

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Exam Objectives in this :

Domain Controllers A domain controller is a computer running Windows Server 2003 that stores a replica of the domain directory (local domain database). Because a domain can contain one or more domain controllers, each domain controller in a domain has a complete replica of the domain s portion of the directory. A domain controller can service only one domain. A domain controller also authenticates user logon attempts and maintains the security policy for a domain. The following list describes the functions of domain controllers:

Sometimes your persistent properties require a lot of memory. One of your fields may represent an image or the text of a very large document. JDBC has special types for these very large objects. The java.sql.Blob type represents binary data, and java.sql.Clob represents character data. The @javax.persistence.Lob annotation is used to map these large object types. Java Persistence allows you to map some basic types to an @Lob and have the persistence manager handle them internally as either a Blob or a Clob, depending on the type of the property: