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An object persistence layer is said to implement persistence by reachability if any instance becomes persistent whenever the application creates an object reference to the instance from another instance that is already persistent. This behavior is illustrated by the object diagram (note that this isn t a class diagram) in figure 12.1. In this example, Computer is a persistent object. The objects Desktop PCs and Monitors are also persistent: They re reachable from the Computer Category instance. Electronics and Cellphones are transient. Note that we assume navigation is possible only to child categories, but not to the parent for example, you can call computer.getChildCategories(). Persistence by reachability is a recursive algorithm. All objects reachable from a persistent instance become persistent either when the original instance is made persistent or just before in-memory state is synchronized with the datastore. Persistence by reachability guarantees referential integrity; any object graph can be completely re-created by loading the persistent root object. An application may walk the object network from association to association without ever having to worry about the persistent state of the instances. (SQL databases have a different approach to referential integrity, relying on declarative and procedural constraints to detect a misbehaving application.) In the purest form of persistence by reachability, the database has some top-level or root object, from which all persistent objects are reachable. Ideally, an instance should become transient and be deleted from the database if it isn t reachable via references from the root persistent object.

Collections are one way to regulate the progress of your deployment project. By creating multiple collections, you can limit the number of workstations you deploy at any one time, to prevent your networks from being flooded with traffic. For example, if you determine that your subnets can handle up to five simultaneous workstation deployments, you can create a number of collections, each of which contains five target computers from every subnet. You can then configure SCCM to advertise each collection at a different time so that the collection deployments never overlap.

You will find sidebars like this one that contain related information you might find helpful. Real World sidebars contain specific information gained through the experience of IT professionals just like you.

Part II helps to familiarize you with the types of questions you will encounter on the Microsoft Certified Professional (MCP) exam. By reviewing the objectives and sample questions, you can focus on the specific skills you need to improve before taking the exam.

Neither Hibernate nor other ORM solutions implement this in fact, there is no analog of the root persistent object in an SQL database and no persistent garbage collector that can detect unreferenced instances. Object-oriented data stores may implement a garbage-collection algorithm, similar to the one implemented for in-memory objects by the JVM. But this option is not available in the ORM world; scanning all tables for unreferenced rows won t perform acceptably. So, persistence by reachability is at best a halfway solution. It helps you make transient objects persistent and propagate their state to the database without many calls to the persistence manager. However, at least in the context of SQL databases and ORM, it isn t a full solution to the problem of making persistent objects transient (removing their state from the database). This turns out to be a much more difficult problem. You can t remove all reachable instances when you remove an object other persistent instances may still hold references to them (remember that entities can be shared). You can t even safely remove instances that aren t referenced by any persistent object in memory; the instances in memory are only a small subset of all objects represented in the database. Let s look at Hibernate s more flexible transitive persistence model.

For a complete list of MCP exams and their related objectives, go to http:// www.microsoft.com/learning/mcp/.

Part II is organized by the exam s objectives. Each chapter covers one of the primary groups of objectives, referred to as Objective Domains. Each chapter lists the tested skills you need to master to answer the exam questions, and it includes a list of further readings to help you improve your ability to perform the tasks or skills specified by the objectives.