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Multiple users: A web application can be executed via a remote machine, so it can effectively be executed by two or more users at the same time (potentially millions of them if it s a successful one!). Identification and state: How does a web application identify a user for the first time and recognize that user when she returns This is especially important because of the stateless nature of the Web (see the An Introduction to State Management section later in this chapter). If you re migrating from desktop application development to the Web, these are just a few issues that derive from the simple fact that an executing web application is (usually) physically separate from its user interface. We ll address all of the issues over the course of the book. This chapter focuses on the web environment and on the architecture of web applications, to give you an idea of the implications of having an application and its user interface on different machines. In this chapter, we ll look at these aspects: How the web works, from the time the user requests a page to the time the user receives the response What a web application is and how it is composed The purpose of HTTP (the protocol underlying the Web) and its role in the request/response interaction between a browser and the web application server The role of the web server in hosting a web application The use of virtual directories in organizing web applications The difference between static content and dynamic content How client-side code and server-side code bring different effects to the world of dynamic content We ll start by taking a look at how the web works and how requests for web pages are processed.

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But look what happens when we generate the execution plan of the join. We know that we are going to pick up just one row from the driver table, so the cardinality of the final result should not be changed from the 16 that we got from the first query, and the cost ought to be Cost of acquiring the one row from the driver + 1 (cardinality from driver) * 14 (cost as for single-table query) Instead we see Execution Plan (8.1.7.4 or 9.2.0.6, or 10.1.0.4 autotrace) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=292 Card=16 Bytes=1712) 1 0 NESTED LOOPS (Cost=292 Card=16 Bytes=1712) 2 1 TABLE ACCESS (BY INDEX ROWID) OF 'DRIVER' (Cost=1 Card=1 Bytes=49) 3 2 INDEX (UNIQUE SCAN) OF 'D_PK' (UNIQUE) 4 1 TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=291 Card=16 Bytes=928) 5 4 INDEX (RANGE SCAN) OF 'T1_I1' (NON-UNIQUE) (Cost=45 Card=16) You will notice that this execution plan uses the traditional nested loop structure even in 9i and 10g remember that one of the conditions I mentioned originally for the use of the new structure was that the driving table should return more than one row. The cardinality for the execution plan is indeed unchanged at 16, but look what s happened to the cost. The cost of the index line has jumped from 4 to 45, and the incremental cost of visiting the table has jumped from 10 to (291 45 =) 246. Where did these numbers come from A quick trip back to the view user_indexes tells us the answer:

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You can take advantage of the Web to set up an application that runs in one central location and can be accessed by users located anywhere in the world, through just a browser and an Internet connection. The earliest web applications weren t really applications in the functional sense, but they took advantage of this basic concept to host documents in a single, central location and enable users to access those documents from distant places. With the global explosion of interest in the Internet, developers all over the world are now creating web applications that are much more functionally rich in their design. Web applications no longer exist just as a central resource for shared documents. Now, they re still a central resource, but we use them interactively to buy groceries, to calculate our taxes, and to send and receive e-mail. Our children use the Web as an exciting, interactive

select blevel, avg_leaf_blocks_per_key, avg_data_blocks_per_key from user_indexes where and ; table_name = 'T1' index_name = 'T1_I1'

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learning experience. We re now using web applications to perform all those interactive tasks that were previously only in the domain of the desktop application. We don t need to install the software anymore; we just need to point the browser across the Internet to the application.

BLEVEL AVG_LEAF_BLOCKS_PER_KEY AVG_DATA_BLOCKS_PER_KEY ---------- ----------------------- ----------------------2 44 246 The cost of the index line is blevel + avg_leaf_blocks_per_key 1 The incremental cost of the table line is avg_data_blocks_per_key In the special case of a join that uses equality on the entire index, the optimizer changes its cost calculation to use the precalculated values stored in the user_indexes view (although I cannot explain the appearance of that minus 1 ) And, as we saw in 6, these values are based on knowing the actual number of distinct keys, rather than multiplying together the individual selectivities of the column involved So, in theory, this should give us a more realistic value for the cost of the join.

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