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<Serializable()> _ Public Class Customer Inherits BusinessBase(Of Customer) Protected Overrides Sub AddBusinessRules() ValidationRules.AddRule( _ AddressOf CommonRules.StringRequired, "Name") End Sub ' rest of class End Class This associates the rule method with the Name property so that the PropertyHasChanged() call within the property s Set block will automatically invoke the rule. You ll see this and other rule methods used in 8 within the sample application s business objects.

Whereas you might see an ORA-08177 error in a SERIALIZABLE transaction, you expect to see an ORA-1555: snapshot too old error with READ ONLY transactions This will happen on a system where other people are actively modifying the information you are reading The changes (undo) made to this information are recorded in the rollback segments But rollback segments are used in a circular fashion in much the same manner as redo logs The longer the report takes to run, the better the chance that some undo you need to reconstruct your data won t be there anymore The rollback segment will have wrapped around, and the portion of it you need we be reused by some other transaction At this point, you will receive the ORA-1555 error and have to start over again.

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The only solution to this sticky issue is to have rollback segments that are sized correctly for your system Time and time again, I see people trying to save a few megabytes of disk space by having the smallest possible rollback segments ( Why waste space on something I don t really need is the thought) The problem is that the rollback segments are a key component of the way the database works, and unless they are sized correctly, you will hit this error In 16 years of using Oracle 6, 7, and 8, I can say I have never hit an ORA-1555 error outside of a testing or development system In such a case, you know you have not sized the rollback segments correctly and you fix it We will revisit this issue in 9..

A slightly more complex variation is one in which the rule method needs extra information beyond that provided by the basic RuleArgs parameter. In these cases, the RuleArgs class must be subclassed to create a new object that adds the extra information. A rule method to enforce a maximum length on a string, for instance, requires the maximum length value.

Figure 6-1 illustrates the core components that build the DPWS stack. The core transport components are UDP with its multicast messages that are used for discovery and TCP/IP for data exchange. The messages are sent between a client and server with the HTTP protocol that sits on top of TCP/IP. All messages are in the Simple Object Access Protocol (SOAP) format, which is based on XML and is used for common Web Services. Next, there are some core standards from the Web Services technology like WS-Addressing, WS-Security, and WS-Policy. On top of these basic components are the standards for discovery, metadata exchange, and eventing. These components and standards provide a common communication solution flexible enough to use for multiple domains, because you are able to build your custom vendor- or domain-specific protocols.

So far, we ve seen how multi-versioning provides us with non-blocking reads, and I have stressed that this is a good thing: consistent (correct) answers with a high degree of concurrency. What could be wrong with that Well, unless you understand that it exists and what it implies, then you are probably doing some of your transactions incorrectly. Recall from 1 the scheduling resources example whereby we had to employ some manual locking techniques (via SELECT FOR UPDATE to serialize modifications to the SCHEDULES table by resource). But can it affect us in other ways The answer to that is definitely yes. We ll go into the specifics in the sections that follow.

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