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The SWITCH_CURRENT_CONSUMER_GROUP procedure takes three parameters the new group, the old group, and a parameter in case of an error and enables the user to switch the resource group. You can use this procedure while running large jobs, for example, so the new group can give you access to more resources. The syntax of the procedure is as follows: SQL> EXEC DBMS_SESSION.SWITCH_CURRENT_CONSUMER_GROUP( new_consumer_group IN VARCHAR2, old_consumer_group OUT VARCHAR2, initial_group_on_error IN BOOLEAN); SQL> For example, you can switch yourself to a new group, sales, from your current group, admin, by using the following statement: SQL> DECLARE admin VARCHAR2(30)); BEGIN EXEC DBMS_SESSION.SWITCH_CURRENT_CONSUMER_GROUP('sales', 'admin' false); END; SQL>

Oracle provides the DBMS_SYSTEM package, which you can use to manipulate other user sessions, gather event information, and so on. It s similar in some respects to the DBMS_SESSION package, but you can use the DBMS_SYSTEM package to modify any session s behavior. For example, you can use this package if you want to set tracing on for a user from a different session. Thus, you can trace a developer s session from your session.

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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, OLTPtype 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 a SERIALIZABLE transaction, you shouldn t expect to update the same information as other transactions If you do, you should use the SELECT .. FOR UPDATE as described previously in 1, and this will serialize the access.

3. Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides, Design Patterns: Elements of Reusable Object-Oriented Software (Boston: Addison-Wesley Professional, 1995).

The DBMS_SYSTEM package is fairly well known, but it s an undocumented package. You won t find referTip ences to it in the manuals. Oracle doesn t support the use of this package, and you use it at your own risk. Not to worry the most useful procedures of this package work just fine all the time.

Listing 24-6 shows the components of the DBMS_SYSTEM package (log in as the user SYS). Listing 24-6. The DBMS_SYSTEM Package SQL> DESC DBMS_SYSTEM Argument Name Type In/Out Default ----------------------------- --------------- ---------------PROCEDURE READ_EV_/* Get the level of events in the current session*/ IEV BINARY_INTEGER IN OEV BINARY_INTEGER OUT PROCEDURE SET_BOOL_PARAM _IN_SESSION SID NUMBER IN SERIAL# NUMBER IN PARNAM VARCHAR2 IN BVAL BOOLEAN IN PROCEDURE SET_EV /*Set an event in a session*/ SI BINARY_INTEGER IN SE BINARY_INTEGER IN EV BINARY_INTEGER IN LE BINARY_INTEGER IN NM VARCHAR2 IN PROCEDURE SET_INT_PARAM _IN_SESSION /*Set integer_type init parameters in a session*/ SID NUMBER IN SERIAL# NUMBER IN PARNAM VARCHAR2 IN INTVAL BINARY_INTEGER IN PROCEDURE SET_SQL_TRACE_IN _SESSION /* Trace any user session */ SID NUMBER IN SERIAL# NUMBER IN SQL_TRACE BOOLEAN IN PROCEDURE WAIT_FOR_EVENT /* Puts the current session in a wait mode for a wait event */ EVENT EXTENDED_ID TIMEOUT SQL>

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) Oracle finds this method scalable enough to run all of their TPC-Cs (an industry standard OLTP benchmark; see wwwtpcorg for details) In many other implementations, you will find this being achieved with shared read locks and their corresponding deadlocks, and blocking Here 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.

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