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You can have the Database Resource Manager automatically assign a user session to a particular consumer group, based on certain session attributes You map the session attributes to various consumer groups, and when the user logs in, the relevant consumer group is automatically assigned to the user based on the user s attributes If there is a conflict, it can be resolved by a prioritizing of the mapping between session attributes and resource consumer groups You use two DBMS_RESOURCE_MANAGER packages, SET_CONSUMER_GROUP_MAPPING and SET_CONSUMER_MAPPING_PRI, to map session attributes and consumer resource groups and set the priorities in the mappings There are two distinct types of session attributes The first set encompasses login attributes, which help the Database Resource Manager determine the user s initial consumer group The other set of session attributes consists of runtime attributes.

The following are some of the session attributes that are considered when mapping a user session to a particular consumer resource group: ORACLE_USER SERVICE_NAME CLIENT_OS_USER CLIENT_PROGRAM CLIENT_MACHINE MODULE_NAME You map each of these session attributes to a particular resource consumer group using the SET_CONSUMER_GROUP_MAPPING procedure In the following example, the hr user is mapped to the HUMAN_RESOURCES_GROUP at login time: SQL> EXECUTE DBMS_RESOURCE_MANAGERSET_CONSUMER_GROUP_MAPPING (DBMS_RESOURCE_MANAGERORACLE_USER, 'HR', 'HUMAN_RESOURCES_GROUP'); After login time, as the user s session attributes change, so does the user s resource consumer group, based on the mapping between session attributes and resource groups At times, there can be a conflict between two mappings, and to resolve these conflicts, you use the SET_CONSUMER_MAPPING_PRI procedure to set priorities for the various session attributes, ranging from 1 to 10, with 1 being the least important and 10 being the most important priority value Here s an example: SQL> EXECUTE DBMS_RESOURCE_MANAGER.

SET_CONSUMER_GROUP_MAPPING_PRI ( EXPLICIT => 1, CLIENT_MACHINE => 2, MODULE_NAME => 3, ORACLE_USER => 4, SERVICE_NAME => 5, CLIENT_OS_USER => 6, CLIENT_PROGRAM => 7, MODULE_NAME_ACTION => 8, SERVICE_MODULE=>9, SERVICE_MODULE_ACTION=>10); When a session attribute changes, the user is automatically switched to the relevant resource consumer group..

// class Router public class Router : System.ComponentModel.Component { private System.Messaging.MessageQueue messageQueueVehiclesToAssemble; private System.Messaging.MessageQueue messageQueueOrders;

Quite often, you may be called upon to help recover from a logical corruption of the database, rather than from a hardware failure. You can use the following flashback techniques in Oracle Database 11g to recover from logical errors: Flashback Database: Takes the entire database back to a specific point in time Flashback Table: Returns individual tables to a past state Flashback Drop: Undoes a DROP TABLE command and recovers the dropped table Flashback Query, Flashback Version Query, and Flashback Transaction Query: Retrieve data from a time (or an interval) in the past Flashback Transaction Backout: Lets you undo a transaction, together with all its dependent transactions as well, with just a single click in the Database Control Flashback Data Archive: Stores history of the changes made to a table, which you can use to make queries using older versions of data and for auditing purposes as well I discuss the Flashback Database, Flashback Drop, and the Flashback Data Archive features in 16, which deals with recovery techniques. I discuss the Flashback Table, Flashback Query, Flashback Version Query, Flashback Transaction Query, and the new Flashback Transaction Backout features that rely on undo data, and are discussed in 8.

The new Oracle Database 11g feature, Flashback Data Archive, lets you automatically store, retrieve, and purge historical data for any length of time you wish. I discuss this exciting feature in 16.

// public Router(System.ComponentModel.IContainer container) { // // start waiting for the first incoming message messageQueueOrders.BeginReceive(); } public Router() { InitializeComponent(); // start waiting for the first incoming message messageQueueOrders.BeginReceive(); } private void InitializeComponent() { this.messageQueueVehiclesToAssemble = new System.Messaging.MessageQueue(); this.messageQueueOrders = new System.Messaging.MessageQueue(); // // messageQueueVehiclesToAssemble // this.messageQueueVehiclesToAssemble.Path = "alessandra\\Private$\\AsapVehiclesToAssemble"; // // messageQueueOrders // this.messageQueueOrders.Path = "alessandra\\Private$\\AsapOrders"; this.messageQueueOrders.ReceiveCompleted += new System.Messaging.ReceiveCompletedEventHandler(this.OrderReceived); } public void SubmitForAssembly(WorkOrder theWorkOrder) { messageQueueVehiclesToAssemble.Send(theWorkOrder); } public System.Messaging.Message[] GetVehicleAssemblyMessages() { return messageQueueVehiclesToAssemble.GetAllMessages(); } private void OrderReceived(object sender, System.Messaging.ReceiveCompletedEventArgs e) { System.Messaging.XmlMessageFormatter formatter = new System.Messaging.XmlMessageFormatter(new Type[] {typeof(WorkOrder)}); System.Messaging.Message msg = messageQueueOrders.EndReceive(e.AsyncResult); msg.Formatter = formatter; WorkOrder workOrder = msg.Body as WorkOrder;

Oracle provides a huge number of internal tables to aid you in tracking changes to database objects and to fix problems that will occur from time to time. Mastering these key internal tables is vital if you want to become a savvy Oracle DBA. All the GUI tools, such as OEM, depend on these key internal tables (and views) to gather information for monitoring Oracle databases. Although you may want to rely on GUI tools to perform your database administration tasks, it is important to learn as much as you can about these internal tables. Knowledge of these tables helps you understand what is actually happening within the database.