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In general, common sense prevails in estimating the amount of redo created. If the operation you perform causes undo data to be created, then determine how easy or hard it will be to reverse (undo) the effect of your operation. If you INSERT 2,000 bytes, the reverse of this is easy. You simply go back to no bytes. If you DELETE 2,000 bytes, the reverse is INSERTing 2,000 bytes. In this case, the redo is substantial. Armed with this knowledge, you will avoid deleting from temporary tables. You can use TRUNCATE, bearing in mind, of course, that TRUNCATE is DDL that will commit your transaction, and in Oracle9i and before invalidate your cursors. Or just let the temporary tables empty themselves automatically after a COMMIT or when your session terminates. All of these methods generate no undo and, therefore, no redo. You should try to avoid updating a temporary table unless you really have to for some reason. You should use temporary tables mostly as something to be INSERTed into and SELECTed from. In this fashion, you ll make optimum use of their unique ability to not generate redo.

ne of the key challenges in developing multiuser, database-driven applications is to maximize concurrent access and, at the same time, ensure that each user is able to read and modify the data in a consistent fashion. The locking mechanisms that allow this to happen are key features of any database, and Oracle excels in providing them. However, Oracle s implementation of these features is specific to Oracle just as SQL Server s implementation is to SQL Server and it is up to you, the application developer, to ensure that when your application performs data manipulation, it uses these mechanisms correctly. If you fail to do so, your application will behave in an unexpected way, and inevitably the integrity of your data will be compromised (as was demonstrated in 1). In this chapter, we ll take a detailed look at how Oracle locks both data (e.g., rows in tables) and shared data structures (such as those found in the SGA). We ll investigate the granularity to which Oracle locks data and what that means to you, the developer. When appropriate, I ll contrast Oracle s locking scheme with other popular implementations, mostly to dispel the myth that row-level locking adds overhead; it adds overhead only if the implementation adds overhead. In the next chapter, we ll continue this discussion and investigate Oracle s multiversioning techniques and how locking strategies interact with them.

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In AOP, we often find that in addition to affecting dynamic behavior using advice, it is necessary for aspects to affect the static structure in a crosscutting manner. While dynamic crosscutting modifies the execution behavior of the program, static crosscutting modifies the static structure of the types the classes, interfaces, and other aspects and their compile-time behavior. There are four broad classifications of static crosscutting: member introduction, type-hierarchy modification, compile-time error and warning declaration, and exception softening. In this section, we study the first three kinds. Understanding exception softening requires additional design considerations for effective use, and we will visit that along with other similar topics in chapter 4. 3.3.1 Member introduction Aspects often need to introduce data members and methods into the aspected classes. For example, in a banking system, implementing a minimum balance rule may require additional data members corresponding to a minimum balance and a method for computing the available balance. AspectJ provides a mechanism called introduction to introduce such members into the specified classes and interfaces in a crosscutting manner. The code snippet in listing 3.6 introduces the _minimumBalance field and the getAvailableBalance() method to the Account class. The after advice sets the minimum balance in SavingsAccount to 25.

We ve already discussed a lot of undo segment topics. We ve seen how they are used during recovery, how they interact with the redo logs, and how they are used for consistent, non-blocking reads of data. In this section, we ll look at the most frequently raised issues with undo segments. The bulk of our time will be spent on the infamous ORA-01555: snapshot too old error, as this single issue causes more confusion than any other topic in the entire set of database topics. Before we do this, however, we ll investigate one other undo-related issue: the question of what type of DML operation generates the most and least undo (you might already be able to answer that yourself, given the preceding examples with temporary tables).

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