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The OEM is very handy when managing users in the database. However, you may wish to use a SQL script from time to time to glean information about the users. Specific data dictionary views can help you see who has what role, and what privileges a certain role has. You can also see what system- and object-level privileges have been granted to a certain user. Table 12-1 presents the key data dictionary views you can use to manage users, privileges, and roles in the database.

' class FormMain Public Class FormMain Inherits System.Windows.Forms.Form ' manages connections to incoming and outgoing message queues Private _router As Router

DBA_USERS DBA_ROLES DBA_COL_PRIVS DBA_ROLE_PRIVS DBA_SYS_PRIVS DBA_TAB_PRIVS ROLE_ROLE_PRIVS ROLE_SYS_PRIVS ROLE_TAB_PRIVS SESSION_PRIVS SESSION_ROLES

Provides information about users Shows all the roles in the database Shows column-level object grants Shows users and their roles Shows users who have been granted system privileges Shows users and their privileges on tables Shows roles granted to roles Shows system privileges granted to roles Shows table privileges granted to roles Shows privileges currently enabled for the current session Shows roles currently enabled for the current session

The traditional means of ensuring data security (using privileges, roles, views, etc) works pretty well, but it has certain limitations Chief among these is the fact that most security measures are too broadbased, with the result that you end up unnecessarily restricting users when your primary goal is to ensure that users can freely access information they need In addition to the traditional concepts of roles and privileges, Oracle provides more fine-grained, lower-level data security techniques For example, you can allow all users to access a central table, such as a payroll table, but you can institute security policies that limit an individual user s access to only those rows in the table that pertain to his or her department Such limitations are transparent to the database users.

Public Sub New() MyBase.New() 'This call is required by the Windows Form Designer. InitializeComponent() _router = New Router AddHandler _router.OnMessage, AddressOf HandleOrder End Sub Private Sub HandleOrder(ByVal theWorkOrder As WorkOrder) ' a WorkerOrder has arrived. Skip the actual vehicle ' assembly details and just issue an invoice _router.SubmitForInvoicing(theWorkOrder) End Sub ' End Class

Oracle uses two related mechanisms to enforce fine-grained security within the database: an application context and a fine-grained access control (FGAC) policy Oracle uses the term virtual private database to refer to the implementation of fine-grained access control policies using application contexts Often, you ll find the terms fine-grained access control, virtual private database, and row-level security used interchangeably to refer to Oracle s capability to ensure security at the individual row level instead of the table level By using Oracle s fine-grained access control, you can fine-tune security policies in a very sophisticated manner You can use the fine-grained access control for the following purposes: Enforce row-level access control through SELECT, INSERT, UPDATE, and DELETE statements Create a security policy that controls access based on a certain value of a column.

Create policies that are applied the same way always as well as policies that dynamically change during the execution of the query Create sets of security policies, called policy groups Oracle lets you control row-level access to database objects through the virtual private database (VPD) feature Each user of an application can be limited to seeing only a part of a table s data by using the VPD concept This row-level security is enforced by attaching a security policy directly to a database object, such as a table, view, or synonym No matter which tool the user uses to access the database (SQL*Plus, an ad hoc query tool, or a report writer), the user can t elude this row-level security, which is enforced by the database server Since the database enforces VPD, it provides much stronger security than application-based security.

' class Router Public Class Router Inherits System.ComponentModel.Component Public Sub New(ByVal Container As System.ComponentModel.IContainer) MyClass.New() 'Required for Windows.Forms Class Composition Designer support Container.Add(Me) MessageQueueVehiclesToAssemble.BeginReceive() End Sub Public Sub New() MyBase.New() 'This call is required by the Component Designer. InitializeComponent() MessageQueueVehiclesToAssemble.BeginReceive() End Sub ' Private Sub InitializeComponent() Me.MessageQueueVehiclesToInvoice = New System.Messaging.MessageQueue Me.MessageQueueVehiclesToAssemble = New System.Messaging.MessageQueue ' 'MessageQueueVehiclesToInvoice ' Me.MessageQueueVehiclesToInvoice.Path = _ "FormatName:DIRECT=OS:alessandra\private$\asapvehiclestoinvoice"