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Every Oracle database has at least two online redo log groups with at least a single member (redo log file) in each group. These online redo log groups are used in a circular fashion. Oracle will write to the log files in group 1, and when it gets to the end of the files in group 1, it will switch to log file group 2 and begin writing to that one. When it has filled log file group 2, it will switch back to log file group 1 (assuming you have only two redo log file groups; if you have three, Oracle would, of course, proceed to the third group). Redo logs, or transaction logs, are one of the major features that make a database a database. They are perhaps its most important recovery structure, although without the other pieces such as undo segments, distributed transaction recovery, and so on, nothing works. They are a major component of what sets a database apart from a conventional file system. The online redo logs allow us to effectively recover from a power outage one that might happen while Oracle is in the middle of a write. The archived redo logs let us recover from media failures when, for instance, the hard disk goes bad or human error causes data loss. Without redo logs, the database would not offer any more protection than a file system.

As you can see, The INSERT into the real table generated a lot of redo. Almost no redo was generated for the temporary table. This makes sense there is very little undo data generated for INSERTs and only undo data is logged for temporary tables. The UPDATE of the real table generated about twice the amount of redo as the temporary table. Again, this makes sense. About half of that UPDATE, the before image, had to be saved. The after image (redo) for the temporary table did not have to be saved. The DELETEs took about the same amount of redo space. This makes sense, as the undo for a DELETE is big, but the redo for the modified blocks is very small. Hence, a DELETE against a temporary table takes place very much in the same fashion as a DELETE against a permanent table.

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Undo is conceptually the opposite of redo. Undo information is generated by the database as you make modifications to data so that the data can be put back the way it was before the modifications took place. This might be done in support of multi-versioning as we learned in 7 Concurrency and Multi-

because static methods are not invoked on a object, the target() pointcut will not match calls to such a method. There are a few important differences in the way matching is performed between within() and this(): The former will match when the object in the lexical scope matches the type specified in the pointcut, whereas the latter will match when the current execution object is of a type that is specified in the pointcut or its subclass. The code snippet that follows shows the difference between the two pointcuts. We have a SavingsAccount class that extends the Account class. The Account class also contains a nested class: Helper. The join points that will be captured by within(Account) and this(Account) are annotated.

Note If you see the temporary table generating more redo than the permanent table with the INSERT

versioning, or in the event the transaction or statement you are executing fails for any reason, or if we request it with a rollback statement. Whereas redo is used to replay a transaction in the event of failure to recover the transaction undo is used to reverse the effects of a statement or set of statements. Undo, unlike redo, is stored internally in the database in a special set of segments known as undo segments.

management, the DBA will create rollback segments. Using automatic undo management, the system will automatically create and destroy undo segments as necessary. These terms should be considered the same for all intents and purposes in this discussion.

public class Account { ... public void debit(float amount) throws InsufficientBalanceException { ... } private static class Helper { ... } } public class SavingsAccount extends Account { ... }

statement, you are observing a product issue in the database that is fixed in at least Oracle 9.2.0.6 and 10.1.0.4 patch releases (the current shipping releases as of this writing).

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