ASP.NET Web PDF Document Viewer/Editor Control Library

Libraries and binary components provide a common way to reuse software; even the simplest C program is linked to the standard C runtime to benefit from core functions such as memory management and I/O. Modern programs depend on a large number of libraries that are shipped in binary form, and only some of them are written in the same language of the program. Libraries can be linked statically during compilation into the executable or can be loaded dynamically during program execution. Dynamic linking has become significantly common to help share code (dynamic libraries can be linked by different programs and shared among them) and adapt program behavior while executing. Interoperability among binaries compiled by different compilers, even of the same language, can be a nightmare. One of the goals of the .NET initiative was to ease this issue by introducing the Common Language Runtime (CLR), which is targeted by different compilers and different languages to help interoperability among software developed in those languages. The CLR is a runtime designed to run programs compiled for the .NET platform. The binary format of these programs differs from the traditional one adopted by executables; according to the Microsoft terminology, we will use the term managed for the first class of programs and unmanaged otherwise (see Figure 17-1).

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Starting with Oracle 11g Release 1 and above, the options are NOLOGGING, COMPRESS FOR OLTP, and COMPRESS BASIC NOLOGGING disables any compression, COMPRESS FOR OLTP enables compression for all operations (direct or conventional path), and COMPRESS BASIC enables compression for direct path operations only..

Note LOB data that is stored out of line in the LOB segment does not make use of the PCTFREE/PCTUSED

Programs for the .NET platform are distributed in a form that is executed by the CLR. Binaries are expressed in an intermediate language that is compiled incrementally by the Just-In-Time (JIT) compiler during program execution. A .NET assembly, in the form of a .dll or an .exe file, contains the definition of a set of types and the definition of the method bodies, and the additional data describing the structure of the code in the intermediate language form is known as metadata. The intermediate language is used to define method bodies based on a stack-based machine, where operations are performed by loading values on a stack of operands and then invoking methods or operators. Consider the following simple F# program: open System let i = 2 Console.WriteLine("Input a number:") let v = Int32.Parse(Console.ReadLine()) Console.WriteLine(i * v) The F# compiler generates an executable that can be disassembled using the ildasm.exe tool distributed with the .NET Framework. The following screenshot shows the structure of the generated assembly. Since everything in the CLR is defined in terms of types, the F# compiler must introduce the class Hw (named after the file name Hw.fs) in the <StartupCode> namespace. In this class, there is the definition of the _main static method that is the entry point for the execution of the program. This is the method that will contain the intermediate language corresponding to the example F# program. The F# compiler generates several elements that are not defined in the program, whose goal is to preserve the semantics of the F# program in the intermediate language.

parameters set for the table. These LOB blocks are managed differently: they are always filled to capacity and returned to the FREELIST only when completely empty.

These are the parameters you want to pay particularly close attention to. With the introduction of locally managed tablespaces, which are highly recommended, I find that the rest of the storage parameters (such as PCTINCREASE, NEXT, and so on) are simply not relevant anymore.

If you open the _main method, you ll find the following code that we have annotated with the corresponding F# statements: .method public static void _main() cil managed { .entrypoint // Code size 56 (0x38) .maxstack 4 // let i = 2;; IL_0000: ldc.i4.2 IL_0001: stsfld

Index organized tables (IOTs) are quite simply tables stored in an index structure Whereas a table stored in a heap is unorganized (ie, data goes wherever there is available space), data in an IOT is stored and sorted by primary key IOTs behave just like regular tables do as far as your application is concerned; you use SQL to access them as normal They are especially useful for information retrieval, spatial, and OLAP applications What is the point of an IOT You might ask the converse, actually: what is the point of a heap organized table Since all tables in a relational database are supposed to have a primary key anyway, isn t a heap organized table just a waste of space We have to make room for both the table and the index on the primary key of the table when using a heap organized table.