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Web applications: Web applications are applications built with ASP NET These applications have a server-side component and a client-side component The server-side contains the business logic, and the client-side contains the view (GUI) that is displayed in a browser Web applications are accessed via a uniform resource locator (URL) for example, http://wwwsayedhashimicom Web services: Web services are standards-based systems accessible over a network such as the Internet Web services are generally employed to connect disparate systems Web services are sometimes called XML Web Services Smart device applications: Smart device applications are applications that target mobile devices (for example, Smartphone devices) Smart device applications are built with the NET Compact Framework, a subset of the NET Framework Windows services: Windows services are executables that run in the background The special feature of Windows services is that they don t require an interactive user.

So, in general, commands are sent from the iPhone to the card reader accessory with data (card information) being sent in the reverse direction. Looking at this closely, you see that there are two different types of data streams. First, there is the transaction

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A deterministic function, according to the requirements of Oracle, is one that is guaranteed to return the same result every time you give it the same set of inputs. If you use function-based indexes (or, as they should be described, indexes with virtual columns), then the virtual columns have to be defined using deterministic functions. The point of the deterministic function is that if Oracle can determine that the current call to the function is using the same inputs as the previous call, then it can use the previous result and avoid the call or so the manuals say. As far as I can tell, this feature of deterministic functions has never been implemented. But the capability can be emulated by scalar subqueries.

If you run the version of the query that uses the scalar subquery, it will run very quickly, executing the subquery just six times. If you run the version that uses the direct function call, it will take much longer to run, and call the function once for every row in the main body of the query. (The fast version will suffer from exactly the same hash-collision problem of the normal subquery if you change one of the emp rows to have dept_no = 67 or 432 for 10g). This is a fantastic performance benefit. The only drawback is that you can t see the subquery at all in the execution plan, which is identical to the execution plan I showed earlier where the scalar subquery was reported as a column in the output but not used in the where clause. Execution Plan (9.2.0.6 autotrace) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=35 Card=1 Bytes=13) 1 0 SORT (AGGREGATE) 2 1 VIEW (Cost=35 Card=20000 Bytes=260000) 3 2 TABLE ACCESS (FULL) OF 'EMP' (Cost=35 Card=20000 Bytes=60000) Note the complete absence of any clue that there may be anything more to this query than a simple full tablescan of the emp table (and the subsequent aggregation, of course).

information that is sent during normal operation. But a second mode of operation would include the diagnostic commands sent to the accessory and the status sent back. The set of commands and status information used to communicate between the iPhone and card reader form your protocol. Specifically, each command and status chunk of information fits within a structured format that you define to be your protocol. Figure 2 3 depicts the generic format of commands and status transactions. Commands and status are sent in fixed or variable sized data packets or groups of bytes. Generally, the packets are ordered by decreasing importance of information. For example, the command that you are telling the accessory to execute, arguably the most important part of the transfer, is the first part of the packet. It would therefore reside at byte position 0 in an n-byte length packet.

The really wonderful thing about scalar subqueries, though, is that they make it very easy to find out more about the limitations on the hash table. Remember my comment in the section Filter Optimizations that the limit appeared to be 256 in 8i and 9i, and 1,024 in 10g. I had to do a bit of hard work to figure that one out (and it s not the whole story in 10g anyway). But look at what you can do with scalar subqueries: select (select pack1.f_n(16) from dual) x from dual ; We have a scalar subquery that calls a packaged function with a single numeric input (see script scalar_sub_03.sql in the online code suite). The package is defined as follows note particularly the global variable and the way that the two functions increment the global variable before returning their input: create or replace package pack1 as g_ct number(10) := 0;

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