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long time. In 9i, these scripts changed from complex SQL statements to a simple call to a packaged procedure. In 10g, the packaged procedure was enhanced in several ways to allow you to report an execution plan for a single statement still in the view v$sql, or even to report a set of plans for all the statements returned by a query made against either v$sql or the Automatic Workload Repository (AWR) tables. Keep an eye on the script dbmsutl.sql and the dbms_xplan package if you want to keep abreast of the latest developments.

The Filters function allows you to filter synchronized data. This can be extremely useful if you have specific data that you do or do not want to be synchronized to your BlackBerry from your computer. With filters and creative use of information typed in your desktop app, you can really fine-tune the data that is transferred to your BlackBerry. To set up a new filter, click the Filters button (see Figure 2-12) and follow the steps shown below (also see Figure 2-15): 1. 2. 3. 4. 5. 6. 7. 8. 9. Click New. Enter a name for your Filter. Click OK. Click the drop down for Field. Select an Operator such as Starts with, Contains, or Equals. Type a Value to use to compare for the selected field and operator. Click the Add to List button. Repeat steps 4-7 for additional fields. Click the Rules tab at the top. Select one of the two conditions: All Conditions or One or more.

ref class R { initonly int i; public: R() i(5) { } };

It s also critical to work on a stable platform when investigating the optimizer. In my case, the most important features of my starting test environment are Block size 8KB db_file_multiblock_read_count = 8 Locally managed tablespaces Uniform extents of size 1MB Freelist space management not automatic segment space management optimizer_mode = all_rows System statistics (cpu_costing) initially disabled There are various parameters that I might then adjust for different test cases, but I always start with this baseline. So let s build a test case and for this experiment we will go back briefly to 8i. The full script is tablescan_01.sql in the online code suite: execute dbms_random.seed(0) create table t1 pctfree 99 pctused 1

as select rownum trunc(100 * dbms_random.normal) rpad('x',100) from all_objects where rownum <= 10000 ; With this script, I ve created a table of 10,000 rows that also spans 10,000 blocks because of the unusual value I ve chosen for pctfree. (It s a trick I often use in test cases to waste lots of space without generating lots of data occasionally it causes surprises because one row per block is a very special boundary condition.) Using view all_objects if you are running 8i with Java installed is a convenient way of getting about 30,000 rows in a scratch table without resorting to cunning tricks. id, val, padding

10. Click OK to return to the screen shown in the upper right corner (see Figure 2-16). 11. Check or uncheck the box stating Delete from device any data that does not match the filter as desired. Click OK and Save.

Oracle Corp. supplies a lot of useful packages that rarely see the light of day. The dbms_random package is one of these. It includes several procedures for generating pseudo-random data, including a procedure for generating uniform random numbers, a procedure for generating normally distributed random numbers, and a package for creating random strings of a specified size. I frequently use the dbms_random package as a quick, reproducible method for generating test data that approximates to a particular type of production situation.

ref class R { literal int SIZE = 100; literal String^ NAME = "Test"; };

The Field Mapping function allows you to map individual fields from your computer app into your BlackBerry. This can be useful if you need to fine-tune the information added to your BlackBerry (see Figure 2-17). You can complete the following actions: To map a field, click between the left and right columns until you see the double-arrow. To unmap a field, click between the left and right columns until it is blank (the double-arrow goes away). To change which field is mapped on the right column, drag it up or down and drop it. You may need to scroll down the list to see all the possible fields to be mapped.

After generating statistics on the table, I just enable autotrace and run a simple query. Since there are no indexes on the table, Oracle has to perform a tablescan, and under Oracle 8i you will get an execution plan like this one: select from ; max(val) t1