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Most business objects contain moderate amounts of data in their fields. For these, the default .NET default garbage collection behavior is fine. With that behavior, you don t know exactly when an object will be destroyed and its memory reclaimed. But that s almost always OK, because this is exactly what garbage collection is designed to do. However, the default garbage collection behavior may be insufficient when objects hold onto expensive or unmanaged resources until they re destroyed. These resources include things like open database connections, open files on disk, synchronization objects, handles, and any other

You can use the Cocoa API for adding entries to a dictionary as well:

3. Query execution in traditional systems includes not only processing the query but also accessing the data from physical media. However, memory-resident systems do not have the long access times associated with retrieval from physical media.

objects that already implement IDisposable. These are things that need to be released as soon as possible in order to prevent the application from wasting memory or blocking other users who might need to access a file or reuse a database connection. If business objects are written properly, most of these concerns should go away. Data access code should keep a database connection open for the shortest amount of time possible, and the same is true for any files the object might open on disk. However, there are cases in which business objects can legitimately contain an expensive resource something like a multi-megabyte image in a field, perhaps.

In such cases, the business object should implement the IDisposable interface, which will allow the UI code to tell the business object to release its resources. This interface requires that the object implement a Dispose() method to actually release those resources: [Serializable()] public class MyBusinessClass : BusinessBase<MyBusinessClass>, IDisposable { private bool _disposedValue; protected void Dispose(bool disposing) { if (!_disposedValue) if (disposing) { // free unmanaged resources } // free shared unmanaged resources _disposedValue = true; } public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } ~EditableRoot() { Dispose(false); } } The UI code can now call the object s Dispose() method (or employ a using statement) when it has finished using the object, at which point the object will release its expensive resources. Note, however, that if a business object is retrieved using a remote data portal configuration, the business object will be created and loaded on the server. It s then returned to the client as discussed in 4. The result, however, is that there s a copy left in memory on the server. Because of this, there s no way to call the business object s Dispose() method on the server. To avoid this scenario, any time that the data portal may be configured to run outside of the client process, the business object designs must avoid any requirement for a Dispose() method. Happily, this is almost never an issue with a properly designed business object, since all database connections or open files should be closed in the same method from which they were opened.

The cardinality of each relation The number of pages in the segment that hold tuples of each relation The fraction of data pages in the segment that hold tuples of relation (blocking factor, or fill) For each index: The number of distinct keys in each index The number of pages in each index These statistics come from several sources within the system The statistics are created when a relation is loaded and when an index is created They are then updated periodically by a user command,4 which can be run by any user System R does not update these statistics in real time because of the extra database operations and the locking bottleneck this would create at the system catalogs Dynamic updating of statistics would tend to serialize accesses that modify the relation contents and thus limit the ability of the system to process simultaneous queries in a multiuser environment.

If you re calling a remote data portal, you must avoid object designs that require IDisposable. Alternatively, you can modify the SimpleDataPortal class to explicitly call Dispose() on your business objects on the server.