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Applications that attempt to enforce their own data integrity constraints, such as the resource scheduler described in 1 Developing Successful Oracle Applications , must take extra care in this regard If you recall, the problem in 1 was that we could not enforce our integrity constraint in a multiuser system since we could not see changes made by other uncommitted sessions Using SERIALIZABLE, we would still not see the uncommitted changes, but we would also not see the committed changes made after our transaction began! As a final point, be aware that SERIALIZABLE does not mean that all transactions executed by users will behave as if they were executed one right after another in a serial fashion It does not imply that there is some serial ordering of the transactions that will result in the same outcome The phenomena previously described by the SQL standard do not make this happen.

The class initialization join point in this code snippet encompasses a call to the System.loadLibary() method and the try/catch block surrounding it. If there were multiple static blocks, the join point will include all of those as well. Note that this join point is present even when you do not have an explicit static block. Such join points still represent the loading of the class and can be used to weave class load-time actions. Object initialization join points The object initialization join points capture the initialization of an object starting from the return of a parent class s constructor until the end of the first called constructor. While class initialization join points are encountered when a class loader loads a class, object initialization occurs when an object is created. Typically, these join points are used in advice that needs to perform certain additional object initialization. This code shows the object initialization join points:

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A question that application developers often pose to me is, How can I audit every attempt to modify secure information and record the values they were trying to modify They want to not only prevent the attempted modification from taking place, but also create a permanent record of the attempt Before the advent of autonomous transactions, many developers tried (and failed) to do this using standard triggers without an autonomous transaction The trigger would detect the UPDATE and, upon discovering a user modifying data she should not, it would create an audit record and fail the UPDATE Unfortunately, when the trigger failed the UPDATE, it also rolled back the audit record it was an all-or-nothing failure With autonomous transactions, it is now possible to securely capture the audit of an attempted operation as well as roll back that operation.

This last point is a frequently misunderstood concept, and a small demonstration will clear it up The following table represents two sessions performing work over time The database tables A and B start out empty and are created as follows: ops$tkyte@ORA11GR2> create table a ( x int ); Table created ops$tkyte@ORA11GR2> create table b ( x int ); Table created..

Alter session set isolation_level=serializable; --

In the process, we can inform the end user that she has attempted to modify data that she does not have permission to modify and that a record of the attempt has been made It is interesting to note that the native Oracle AUDIT command provided the ability to capture unsuccessful attempts to modify information, using autonomous transactions, for many years The exposure of this feature to Oracle developers allows us to create our own, more customized auditing Here is a small example Let s place an autonomous transaction trigger on a table that captures an audit trail, detailing who tried to update the table and when that person tried to do it, along with a descriptive message of which data the person tried to modify.

public class SavingsAccount extends Account { ... public SavingsAccount(int accountNumber, boolean isOverdraft) { super(accountNumber); _isOverdraft = isOverdraft; Object } public SavingsAccount(int accountNumber) { this(accountNumber, false); } ... }

Alter session set isolation_level=serializable; -Insert into b select count(*) from a; -Commit;

The logic behind this trigger will be that it will prevent any attempt to update the record of an employee who does not (directly or indirectly) report to you First, we make a copy of the EMP table from the SCOTT schema to use as our example table: ops$tkyte@ORA10G> create table emp 2 as 3 select * from scottemp; Table created ops$tkyte@ORA10G> grant all on emp to scott; Grant succeeded We also create an AUDIT_TAB table in which to store the audit information Note that we re using the DEFAULT attribute of the columns to have the currently logged in username and the current date/time logged into our audit trail as well: ops$tkyte@ORA10G> 2 ( username 3 timestamp 4 msg 5 ) 6 / Table created create table audit_tab varchar2(30) default user, date default sysdate, varchar2(4000).

Insert into a select count(*) from b; -Commit; --

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