.NET/ASP.NET/C#/VB.NET PDF Document SDK

For example, all of the employees in department 10 will be stored on the same block (or as few blocks as possible, if they all don t fit) It is not storing the data sorted that is the role of the IOT It is storing the data clustered by some key, but in a heap So, department 100 might be right next to department 1, and very far away (physically on disk) from departments 101 and 99 Graphically, you might think of it as shown in Figure 10-8 On the left side of the image, we are using conventional tables EMP will be stored in its segment DEPT will be stored on its own They may be in different files and different tablespaces, and they are definitely in separate extents On the right side of the image, we see what would happen if we clustered these two tables together.

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> open System;; > let o = Activator.CreateInstance(Type.GetTypeFromProgID("Word.Application"));; val o : obj > let t = o.GetType();; val t : Type > t.GetProperty("Visible").SetValue(o, (true :> Object), null);; val it : unit = () > let m = t.GetMethod("Quit");; val m : Reflection.MethodInfo > m.GetParameters().Length;; val it : int = 3 > m.GetParameters();; val it : ParameterInfo [] = [|System.Object& SaveChanges {Attributes = In, Optional, HasFieldMarshal; DefaultValue = System.Reflection.Missing; IsIn = true; IsLcid = false; IsOptional = true; IsOut = false; IsRetval = false; Member = Void Quit(System.Object ByRef, System.Object ByRef, System.Object ByRef); MetadataToken = 134223449; Name = "SaveChanges"; ParameterType = System.Object&; Position = 0; RawDefaultValue = System.Reflection.Missing;}; ... more ... |] > m.Invoke(o, [| null; null; null |]);; val it : obj = null Since F# imposes type inference, you cannot use the simple syntax provided by an interpreter. The compiler should know in advance the number and type of arguments of a method and the methods exposed by an object. You must remember that even if fsi.exe allows you to interactively execute F# statements, it still is subjected to the constraints of a compiled language. Since you are creating an instance of a COM component dynamically in this example, the compiler does not know anything about this component. Thus, it can be typed as just System.Object. To obtain the same behavior of an interpreted language, you must resort to the reflection support of the .NET runtime. Using the GetType method, you can obtain an object describing the type of the object o. Then you can obtain a PropertyInfo object describing the Visible property, and you can invoke the SetValue method on it to show the Word main window. The SetValue method is generic; therefore, you have to cast the Boolean value to System.Object to comply with the method signature.

The square boxes represent database blocks We now have the value 10 factored out and stored once Then, all of the data from all of the tables in the cluster for department 10 is stored in that block If all of the data for department 10 does not fit on the block, then additional blocks will be chained to the original block to contain the overflow, in the same fashion as the overflow blocks for an IOT..

Figure 10-8 Index clustered data So, let s look at how we might go about creating a clustered object Creating a cluster of tables in the object is straightforward The definition of the storage of the object (PCTFREE, PCTUSED, INITIAL, and so on) is associated with the CLUSTER, not the tables This makes sense since there will be many tables in the cluster, and they will be on the same block Having different PCTFREEs would not make sense Therefore, a CREATE CLUSTER statement looks a lot like a CREATE TABLE statement with a small number of columns (just the cluster key columns): ops$tkyte@ORA11GR2> create cluster emp_dept_cluster 2 ( deptno number(2) ) 3 size 1024 4 / Cluster created Here, we have created an index cluster (the other type being a hash cluster, which we ll look at in the next section Index Clustered Tables Wrap-up ).