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Note also that the sort width is 58, which is what you would get with a sort_area_size of around 2MB using the manual workarea_size_policy With a sort_area_size of 204KB (or rather 320KB, which would report an area size of about 204KB), the sort width would be 9 and the initial run count would be 86 leading to three merge passes With a sort_area_size of 10MB (or rather 151MB, which would report an area size of about 10MB), the sort width would be 426 with a run count of two Despite our attempts to pick a pga_aggregate_target that could emulate a sort_area_size of 10MB, we cannot see figures that allow us to align the two parameters in an obvious way.

If you have no memos in the list, then you can add a new memo by pressing the Trackpad and starting to type. If you have memos in the list and want to add a new one, you just click Add Memo. To open an existing memo, just glide to it and click it. You will probably be in Edit mode, where you can change the memo. If not, click the Trackpad again and select Edit. When typing a new memo, you will want to enter a title that will be easy to locate using the Find: feature later, simply by typing a few matching letters. Follow these steps to create a new memo: 1. 2. 3. Type your memo into the Body section. Press the Enter key to go down to the next line. When you re done, click the Trackpad to select Save. TIP: When you pick up an item in the store, check it off by putting a Space character in front of the item; this helps you make sure you get everything, even when you have a long list.

To cap it all, whatever we see in the 10053 trace, remember that the original 10032 trace for this example reported a sort_multiblock_read_count of 31 and a max intermediate merge width of 5 The optimizer assumptions do not form an accurate model of the actual run-time activity Clearly it is not going to be easy to reverse engineer the algorithm that the cost based optimizer uses to derive a cost for a sort So before trying to untangle the knotty problem of how the optimizer works out the IO cost per pass, I d like to run a few more test cases and comment on the results..

If you have copied something from another program, such as E-mail, you can paste it into your memo (see page 22 for details on using copy-and-paste functionality.)

In this chapter, you learned about several special elements that can be declared in classes to model commonly used concepts: properties, to model the has-a relationship; delegates and events, to model actions and responses; and operators, to model mathematical and other functionality. The text looked specifically at conversion operators and the expanded use of the explicit keyword. You also saw various types of conversions and casts. Next, you ll learn all about inheritance.

The scripts I have used to compare the costs for sorting in the four different environments are very similar to the scripts I used in 12. I have a pair of scripts in the online code suite called pat_dump.sql and sas_dump.sql that run the following query after setting the pga_aggregate_target or sort_area_size respectively:

Like the Contacts and Tasks programs, the MemoPad program includes a Find feature you can use to locate memos quickly by typing the first few letters of words that match the title of your memos. Example, typing gr would immediately show you only memos matching those three letters in the first part of any word, such as grocery.