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The data is reconstructed as needed from the undo segments and presented to you as it existed when the report began READ ONLY transactions are not trouble-free, however Whereas you might see an ORA-08177 error in a SERIALIZABLE transaction, you expect to see an ORA-01555 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 undo segments But undo 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 undo segment will have wrapped around, and the portion of it you need would be reused by some other transaction.

public SavingsAccount(int accountNumber) { super(accountNumber, AccountManager.internalId(accountNumber) ); _type = AccountConstants.SAVINGS; } ... }

At this point, you will receive the ORA-01555 error and have to start over again..

What if the transaction we were performing was an update to the employee hierarchy itself We would not see those changes in the trigger, and this must be taken into consideration when evaluating the correctness of this trigger This trigger commits This has never been possible before triggers could never commit work This trigger is not committing the work that actually fired the trigger; rather, it is committing only the work that the trigger has performed (the audit record)..

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The only solution to this sticky issue is to have undo 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 undo segments ( Why waste space on something I don t really need is the thought). The problem is that the undo segments are a key component of the way the database works, and unless they are sized correctly, you will hit this error. In many years of using Oracle 6, 7, 8, 9, 10, and 11, I can say I have never hit an ORA-01555 error outside of a testing or development system. In such a case, you know you have not sized the undo segments correctly and you fix it. We will revisit this issue in 9 Redo and Undo .

In this code snippet, the object pre-initialization encompasses a call to the AccountManager.internalId(accountNumber) method only and not the entire super() call. Advice execution join points The advice execution join point is a recent addition to the AspectJ language. It encompasses the execution of every advice in the system. This join point s usage is not yet fully established. Such join points may be used to advise an advice for purposes such as profiling the advice itself. This code shows the advice execution join point:

So, we have set up the EMP table that has a nice hierarchical structure (EMPNO, MGR recursive relationship) We also have an AUDIT_TAB table into which we want to record failed attempts to modify information We have a trigger to enforce our rule that only our manager or our manager s manager (and so on) may modify our record Let s see how this works by trying to update a record in the EMP table: ops$tkyte@ORA10G> update emp set sal = sal*10; update emp set sal = sal*10 * ERROR at line 1: ORA-20001: Access Denied ORA-06512: at "OPS$TKYTEEMP_AUDIT", line 21 ORA-04088: error during execution of trigger 'OPS$TKYTE.

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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