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be designed with a very narrow focus It is usually better to design many small workers rather than a single large one Smaller workers are easier to develop, to test, and to reuse If workers are the most complex parts in a system, then, according to Axiom 1 in 1, they should also be the least coupled parts Ideally, a Worker should be completely decoupled from the rest of the system If coupling occurs, it should be related only to the use of user-defined types, generally kept in well-known components These well-known components should appear in the center of a star-shaped or concentric coupling diagram, as discussed at the end of 1 From a notification-wiring perspective, you can consider workers as event sources and targets Internally, workers fulfill their mission by implementing all sorts of business logic.

This is generally considered the most restrictive level of transaction isolation, but it provides the highest degree of isolation. A SERIALIZABLE transaction operates in an environment that makes it appear as if there are no other users modifying data in the database. Any row we read is assured to be the same upon a reread, and any query we execute is guaranteed to return the same results for the life of a transaction. For example, if we execute Select * from T; Begin dbms_lock.sleep( 60*60*24 ); end; Select * from T; the answers returned from T would be the same, even though we just slept for 24 hours (or we might get an ORA-1555: snapshot too old error, which is discussed in 8). The isolation level assures us these two queries will always return the same results. Side effects (changes) made by other transactions are not visible to the query regardless of how long it has been running. In Oracle, a SERIALIZABLE transaction is implemented so that the read consistency we normally get at the statement level is extended to the transaction.

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The SET_MODULE procedure is your key DBMS_APPLICATION_INFO procedure. You set a module s name and actions with this procedure. You can incorporate this package in your code so that you can track the performance of the code easily using the V$SESSION and V$SQLAREA dictionary views. Without the DBMS_APPLICATION_INFO package, you ll have a harder time tracking down the exact piece of code in the application that s causing a particular performance problem.

Before you can use the DBMS_APPLICATION_INFO package, the owner SYS should grant execution privileges on the package:

ONLY. It has all of the qualities of the SERIALIZABLE isolation level, but it prohibits modifications. It should be noted that the SYS user (or users connected as SYSDBA) cannot have a READ ONLY or SERIALIZABLE transaction. SYS is special in this regard.

Externally, from the system perspective, workers do this only by handling and firing events Once you decouple workers from the rest of the system, you can design, implement, and test them individually, or at most with the presence of the well-known components containing the userdefined types referenced by the Worker Each Worker, in effect, becomes a separate project with its own test fixture While developing and testing workers, what really matters are the classes inside the Worker and how the classes relate to one another But once you ve fully tested and added the Worker to a larger system, the Worker is little more than a black box that solves business problems It s a software IC with pins At this stage, attention shifts away from a Worker s internal structure and operation, focusing more on how the Worker interacts with the outside world.

Listing 24-3 shows how to use the SET_MODULE procedure. Listing 24-3. Using the SET_MODULE Procedure SQL> CREATE OR REPLACE PROCEDURE delete_employee( 2 name VARCHAR2) 3 AS 4 BEGIN 5 DBMS_APPLICATION_INFO.SET_MODULE( 6 module_name => 'delete_employee', 7 action_name => 'delete from emp'); 8 delete from employees 9 where last_name=name; 10 END; 11* / Procedure created. SQL> User hr can execute this procedure as follows: SQL> EXECUTE delete_employee('Zlotsky'); PL/SQL procedure successfully completed. SQL> You can query the V$SESSION view to see that the DBMS_APPLICATION_INFO.SET_MODULE procedure did indeed do its job: SQL> SELECT username, module, action 2 FROM v$session 3 WHERE username =HR; USERNAME MODULE ACTION ------------------------------ --------------------HR delete_employee delete from emp SQL> You can also query the V$SQLAREA view to see the SQL_TEXT associated with the module delete_employee, as follows: SQL> SELECT sql_text 2 FROM v$sqlarea 3 WHERE module=delete_employee; SQL_TEXT -----------------------------------------------------------DELETE from employees where last_name=:b1 SELECT /*+ all_rows */ COUNT(1) FROM HR.DEPARTMENTS WHERE MANAGER_ID = :1 UPDATE OE.CUSTOMERS SET ACCOUNT_MGR_ID = NULL WHERE ACCOUNT_MGR_ID = :1 SQL>

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