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The Oracle database has supported autonomous transactions internally for quite a while We see them all of the time in the form of recursive SQL For example, a recursive transaction may be performed when selecting from a sequence, in order for you to increment the sequence immediately in the SYSSEQ$ table The update of the SYSSEQ$ table in support of your sequence was immediately committed and visible to other transactions, but your transaction was not committed as yet Additionally, if you roll back your transaction, the increment to the sequence remained in place; it is not rolled back with your transaction, as it has already been committed Space management, auditing, and other internal operations are performed in a similar recursive fashion This feature has now been exposed for all to use However, I have found that the legitimate real-world use of autonomous transactions is very limited.

In this snippet, the exception handler join point encompasses the whole catch block in this case, the invocation of logging and overdraft protection logic. Class initialization join points The class initialization join points represent the loading of a class, including the initialization of the static portion. These join points are used to perform classlevel crosscutting, such as the initialization of class (static) variables. This code shows the class initialization join points:

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Oracle takes an optimistic approach to serialization it gambles on the fact that the data your transaction wants to update won t be updated by any other transaction. This is typically the way it happens, and usually the gamble pays off, especially in quick-transaction, OLTP-type systems. If no one else updates your data during your transaction, this isolation level, which will generally decrease concurrency in other systems, will provide the same degree of concurrency as it would without SERIALIZABLE transactions. The downside to this is that you may get the ORA-08177 error if the gamble doesn t pay off. If you think about it, however, it s worth the risk. If you re using SERIALIZABLE transactions, you shouldn t expect to update the same information as other transactions. If you do, you should use the SELECT ... FOR UPDATE as described in 1 Developing Successful Oracle Applications , and this will serialize the access. So, using an isolation level of SERIALIZABLE will be achievable and effective if you: Have a high probability of no one else modifying the same data. Need transaction-level read consistency. Will be doing short transactions (to help make the first bullet point a reality).

Time after time, I see them used as a work-around to such problems as a mutating table constraint in a trigger This almost always leads to data integrity issues, however, since the cause of the mutating table is an attempt to read the table upon which the trigger is firing Well, by using an autonomous transaction you can query the table, but you are querying the table now without being able to see your changes (which is what the mutating table constraint was trying to do in the first place; the table is in the middle of a modification, so query results would be inconsistent) Any decisions you make based on a query from that trigger would be questionable you are reading old data at that point in time A potentially valid use for an autonomous transaction is in custom auditing, but I stress the words potentially valid.

Oracle finds this method scalable enough to run all of their TPC-Cs (an industry standard OLTP benchmark; see http://wwwtpcorg for details) In many other implementations, you will find this being achieved with shared read locks and their corresponding deadlocks, and blocking In Oracle, we do not get any blocking, but we will get the ORA-08177 error if other sessions change the data we want to change as well However, we will not get the error as frequently as we will get deadlocks and blocks in the other systems But there is always a but you must take care to understand these different isolation levels and their implications Remember, with isolation set to SERIALIZABLE, you will not see any changes made in the database after the start of your transaction, until you commit.

public class Account { ... static { try { System.loadLibrary("accounting"); } catch (UnsatisfiedLinkError error) { ... deal with the error } } ... }

There are more efficient ways to audit information in the database than via a custom written trigger For example, you can use the DBMS_FGA package or just the AUDIT command itself..

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