ASP.NET PDF Viewer using C#, VB/NET

Roughly speaking, there are two main types of dynamic content generation In the first, the scripting type, requests for the same scripted resource produce the same actions: the source page is pumped through the preprocessor every time, and each dynamic construct is distilled to HTML Typically, this type of content generation is limited to using special tags and local code expressions that may refer only to a set of built-in features and occasionally a set of global state variables such as the server response The problem with this approach is inherent: the dynamic functionality is often too limited, although it is simple to use Most important, no caching or compilation is done, and as such it is much slower than the compiled alternatives Furthermore, as dynamic functionality is added to a page, it becomes progressively more complex and more difficult to maintain, often leading to spaghetti code.

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Load Profile Per Second ~~~~~~~~~~~~ -----------------... Parses: 826.6 Hard parses: 780.1 ... Instance Efficiency Indicators ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Buffer Nowait %: 100.00 Buffer Hit %: 99.99 Library Hit %: 63.55 Execute to Parse %: 13.81 Parse CPU to Parse Elapsd %: 96.44

Per Transaction Per Exec Per Call ----------------- ----------- ----------2,238.6 2,112.7

Tying the dynamic content to the presentation layer in this way is well recognized as a significant drawback The second approach is the one taken by ASPNET and JSP Here a page scripting model is combined with an underlying compiled language (Java for JSP, and any NET language for ASPNET) and the speed of serving static content In this model, pages are composed of objects with complex life cycles and are generated/maintained by compiled programs, so a scripted page is translated to a program that generates the final HTML page and as a result can contain arbitrary logic expressed in the source language These programs are produced on the fly and maintained by the web container A change to a web page results in updating the server-side resource responsible for creating that web page.

Redo NoWait %: 100.00 Optimal W/A Exec %: 100.00 Soft Parse %: 5.62 Latch Hit %: 96.80 % Non-Parse CPU: 25.51

Top 5 Timed Events Avg %Total ~~~~~~~~~~~~~~~~~~ wait Call Event Waits Time (s) (ms) Time ----------------------------------------- ------------ ----------- ------ -----CPU time 103 96.1 latch: shared pool 15,814 2 0 1.9 log file parallel write 112 1 8 .8 db file async I/O submit 11 0 35 .4 control file parallel write 34 0 11 .4 What we discover is that the hard parsing goes up a little bit, but the CPU time triples rather than doubles! How could that be The answer lies in Oracle s implementation of latching. On this multi-CPU machine, when we could not immediately get a latch, we spun. The act of spinning itself consumes CPU. Process 1 attempted many times to get a latch onto the shared pool only to discover that process 2 held

This compilation causes a one-time penalty, but subsequent requests will be served without any processing by simply sending the result of the new page-behind code..

that latch, so process 1 had to spin and wait for it (consuming CPU). The converse would be true for process 2; many times it would find that process 1 was holding the latch to the resource it needed. So, much of our processing time was spent not doing real work, but waiting for a resource to become available. If we page down through the statspack report to the Latch Sleep Breakdown report, we discover the following: Get Spin Latch Name Requests Misses Sleeps Gets -------------------------- --------------- ------------ ----------- ----------shared pool 2,311,383 133,507 16,143 117,695 row cache objects 985,847 28,722 4 28,719 Note how the number 16,143 appears in the SLEEPS column here That number corresponds very closely to the number of waits reported in the preceding Top 5 Timed Events report.

Note The number of sleeps corresponds closely to the number of waits; this might raise an eyebrow. Why not

Web development frameworks such as ASP.NET can be a little bewildering at first. One reason for this is the number of languages involved in even simple websites. For example, developing a minimal website using ASP.NET involves using at least five different languages to represent the necessary information: ASP.NET page markup (ASPX), used for the declarative construction and configuration of server controls that form the page HTML, used for the basic presentation content embedded in the ASP.NET markup Cascading Style Sheets (CSS), used for declarative control over visual characteristics of the presentation content XML, used for the configuration files of the website F# and/or another .NET language, used for expressing the website logic In contrast, the programs you ve seen so far in this book have used only one language (F#) with only one kind of file (source code files with the suffix .fs). Furthermore, a fully fledged website can involve further additional languages and schemas: SQL, for the queries and commands used for database access and management JavaScript, for dynamic client-side behavior, a topic we discuss later in this chapter Further XML schemas, for files specifying additional website data or security and configuration information Database connection strings, for configuring access to underlying databases