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Once we know how to deal with the simple case of column = constant, we can move on to slightly more complex cases, such as queries involving lists, queries involving lists with nulls, queries involving two columns, queries involving ranges, and queries involving bind variables. There are plenty of cases to investigate before we worry about indexes and joins. Let s start with the easiest option, in-lists. Sticking with the table that represents our audience of 1,200 people, we can write a query like the following: select from where ; count(*) audience month_no in (6,7,8)

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Click the Next button twice, to complete this page and move past the Confirm Installation page, which informs the user that all the required information has been gathered..

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Given that we ve selected three months, and we expect 100 people per month, we shouldn t be too surprised if the calculated cardinality came out as 300. But I m going to start my investigation with 8i, and unfortunately, the following execution plan is what we get when we build the test with that version of Oracle (see in_list.sql in the online suite): Execution Plan (8.1.7.4) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=1 Card=1 Bytes=3) 1 0 SORT (AGGREGATE) 2 1 TABLE ACCESS (FULL) OF 'AUDIENCE' (Cost=1 Card=276 Bytes=828) Where did that 276 in the full scan come from (Using 9i, or 10g, the cardinality is reported at 300, as expected.) There are two points to consider here. First, the calculation is obviously wrong. Secondly, and more importantly, the calculation changes as you upgrade your version of Oracle and as I pointed out at the start of this chapter, the correct cardinality is crucial to getting the correct join order and optimum choice of indexes. You may see some of your execution plans change for no reason when you upgrade.

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Figure 13-9. Installing the Friends Reunion application 4. When you reach the page with the Finish button, the installation is complete, and you can test it. To do this, run Internet Explorer on the machine and enter the URL http://localhost/FriendsReunionSetup. This should show the home page of your site, just as when you installed the application manually.

The XMLA/SOAP service URL The information required to connect to the OLAP data source The name of the OLAP catalog to use

Internally, the optimizer will convert a predicate like month_no in (6,7,8) to month_no = 6 or month_no = 7 or month_no = 8. If you add the use_concat hint to the query, the optimizer will then transform the plan into a union all of its three component parts at which point 8i suddenly produces the correct cardinality. The error that 8i suffers from is that after splitting the list into three separate predicates, it applies the standard algorithm for multiple disjuncts (the technical term for OR ed predicates). This algorithm generically corrects for rows double-counted where the predicates overlap but of course, the predicates generated from an in-list are guaranteed not to overlap. 8i transforms the SQL to produce a very special case of disjuncts, and then fails to process it correctly.

How It Works The installation process simply creates a folder with the same name as the setup project in the Inetpub\wwwroot folder and specifies it as an application in IIS. If you browse to this directory, you ll see that all of the files here are those that you selected using the File System Editor: the primary output and content files from your project. The installer also knows to place the DLLs into the bin subfolder.

When an oddity like this shows up, you need to think of two things. First: is the example a special case (Our column has only 12 distinct values would the problem occur, or be so apparent, if there were more distinct values ) Second: are there closely related areas that might produce other oddities Let s spend a little time experimenting around these two questions to see what happens. The code to create the base table was as follows: create table audience as select trunc(dbms_random.value(1,13)) from all_objects where rownum <= 1200 ;

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