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n this case study, I ll describe a component that supports pipelined HTTP operations The purpose of this study is to show how you can use an event-based approach to implement high-performance, multithreaded components that have no user interface Before looking at the details, a short digression on HTTP is in order What is HTTP If you haven t heard of it, you ve either just come out of a 15-year coma, or you ve been in solitary confinement for an extended period of time In both cases, this chapter and the rest of the book are probably over your head Getting back to the question, the short answer is this: HTTP is the main application-level protocol in current use on the Internet An overwhelming proportion of Internet traffic is due to HTTP Tim Berners-Lee submitted RFC 19451 to the Internet Engineering Task Force (IETF) in 1996.

This report illustrates the three different phases of Oracle SQL processing: parse, execute, and fetch. For each processing phase, we see the following: The number of times that phase occurred The CPU time elapsed for the phase The real-world time that elapsed The number of physical I/O operations that took place on the disk The number of blocks processed in consistent-read mode The number of blocks read in current mode (reads that occur when the data is changed by an external process during the execution of the statement) The number of blocks that were affected by the statement

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The RFC defined HTTP 10, a simple text-based protocol for client-server interactions Version 10 was derived from version 09, which had been in use since 1990 HTTP is an application-level protocol built on top of TCP/IP; it supports a stateless client-server interaction model In the standard HTTP interaction model, clients initiate interactions with servers Servers are always passive and are designed to respond to client requests An HTTP server has a listener service that waits for incoming requests When a client needs to obtain information from a server, the client must establish a socket connection with the server Once a connection is made, the client sends a request to the server and gets the information back as a response, assuming no errors occurred Most HTTP traffic is related to HTML documents, and most HTML-related client applications are Web browsers With versions of HTTP prior to 1.

Note If you are not familiar with physical I/O, and consistent-read and current mode of blocks, see

You have monthly sales figures for each product Category, and you would like to see what percent of their total sales were attributed to each sales manager. In your pivot table, Sales Manager is in the Row Labels area, Category is in the Column Labels area, and Units is in the Values area (see the table at the left in Figure 3-18). The example shown is from the ManagerSales.xlsx workbook.

1, a client could make only a single request after connecting to the host Upon returning the response, the host closed the connection Opening and closing a host connection with each request was a simple technique, but one that didn t work well with a complex HTML document Why Because when an HTTP 10-compliant Web browser was told to retrieve an HTML document, it first downloaded the HTML text of the document, then it scanned the HTML code and compiled a list of all the images embedded in the document For each image, the browser established a new socket connection to the server hosting the image, downloaded the image, and then closed the connection The connect-disconnect overhead quickly became a bottleneck for network traffic, because the establishment of a TCP socket connection requires a three-way handshake, which is fairly expensive in terms of networking usage.

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