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string style; public string Style { get {return style;} set {style = value;} } string color; public string Color { get {return color;} set {color = value;} } PricedItem[] options; public PricedItem[] Options { get {return options;} set {options = value;} } string id; public string Id { get {return id;} set {id = value;} } // public default constructor is required in serializable classes public WorkOrder() { } public WorkOrder(string theModel, string theStyle, Color theColor, PricedItem[ ] theOptions) { model = theModel; style = theStyle; color = theColor.Name; options = theOptions; id = Guid.NewGuid().ToString(); } }

Oracle doesn t allow you to access the internal data dictionary tables directly. It creates views on the base dictionary tables and creates public synonyms for these views so users can access them. There are three sets of data dictionary views USER, ALL, and DBA with each set of views pertaining to a similar item containing similar columns. The views in each category are prefixed by the keywords USER, ALL, or DBA. Each of these sets of views shows only the information the user is granted privileges to access, as follows: USER: The USER views show a user only those objects that the user owns. These views are useful to users, especially developers, for viewing the owner s objects, grants, and so on. ALL: The ALL views show you information about objects for which you have been granted privileges. The views with the prefix ALL include information on the user s objects, and all other objects on which privileges have been granted, directly or through a role. DBA: The DBA views are the most powerful in their range. Users who have been assigned the DBA role can access information about any object or any user in the database. The DBAprefixed dictionary views are the ones you use to monitor and administer the database.

The data dictionary is created automatically when you create the database. Well, almost automatically, because you do have to run the catalog.sql script manually (located in the $ORACLE_HOME/ rdbms/admin directory) if you aren t using the Database Configuration Assistant. The catalog.sql script creates the data dictionary tables, views, and synonyms, and they re the first set of objects to populate the database. The data dictionary, once created, has to remain in the System tablespace. In the rest of the chapter, you ll see detailed references to the DBA data dictionary tables only, because the focus here is on database management. There are many data dictionary tables and views. You ll examine the most useful of the data dictionary views in the next few sections.

Private _name As String Public Property Name() As String Get Return _name End Get Set(ByVal Value As String) _name = Value End Set End Property Private _cost As Decimal Public Property Cost() As Decimal Get Return _cost End Get Set(ByVal Value As Decimal) _cost = Value End Set End Property Public Overrides Function ToString() As String Return _name End Function ' public default constructor is required in serializable classes Public Sub New() End Sub Public Sub New(ByVal theName As String, ByVal theCost As Decimal) _name = theName _cost = theCost End Sub End Class ' class WorkOrder

The data dictionary contains metadata about your database. The data dictionary tables and the views based on them are called static, because the running database instance doesn t modify data in

these tables and views. The tables and views are modified only if you make a change to the data dictionary itself, for example, by creating a table or a new user. No matter whether you manage the database manually or use sophisticated GUI-based management tools, the data dictionary (along with the dynamic performance tables) is the source for all information about the database.

Let s look at a simple example of FGAC. This FGAC implementation will use a policy that limits an employee to only seeing appropriate data in the employees table.

<Serializable()> _ Public Class WorkOrder Private _model As String Public Property Model() As String Get Return _model End Get Set(ByVal Value As String) _model = Value End Set End Property Private _style As String Public Property Style() As String Get Return _style End Get