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In the two examples with bind variables, we see that the CBO has used the standard 025% for the range, and when we check column = :bind, we find that 41 comes from num_rows / num_distinct Finally, looking carefully at the density, we discover (and confirm with a few more test data sets) that density = 1 / (2 * num_rows) which is probably why we end up seeing a cardinality of 1 whenever we go outside the low/high range, or ask for a value that is not in the histogram There is one little detail that you might also notice if you look closely at histograms In 10g, the number of buckets for a frequency histogram (user_tab_columnsnum_buckets) matches the number of distinct values in the table For earlier versions of Oracle, it is one short.

One great navigation feature on your BlackBerry is the front trackpad, which can glide any direction as well as be clicked. While this may take some getting used to for seasoned BlackBerry users (if you were used to the familiar trackball or side trackwheel), you will quickly see that the trackpad gives you lots of freedom to scroll up and down and left to right using your thumb. It is incredibly intuitive to use. The other thing that is great is that clicking in the trackpad will give you an innovative short menu that is context sensitive. Sometimes, it is so sensitive that it almost seems as if it reading your thoughts. Type an e-mail message, and then click the trackpad. Notice that Send is highlighted, so you can simply click the trackpad again to send your e-mail message. There are also some great features that are user-adjusted with regards to the trackpad.

This is just a change in the view definition, which failed to allow for frequency histograms in earlier versions Clearly, frequency histograms are a good thing but there are a couple of special points to consider when creating them or using them: You might as well use 254 (the maximum allowed) as the number of buckets when gathering statistics Oracle will only record the required number of rows anyway, so there is no point risking missing the critical bucket count If critical values in your data change, your histogram needs to be rebuilt otherwise Oracle will have an out-of-date picture of the data Note that 405 reported a cardinality of 1: if we changed all the 40s to be 405, then Oracle would still report skew = 40 with 40 rows Frequency histograms have no impact on expressions with bind variables (if they are not peeked).

Each user has a different preference for how quickly he or she likes to navigate the Home screen and the sensitivity of the trackpad. To adjust the trackpad sensitivity, follow these steps. 1. 2. 3. Click the Options icon. Scroll down and click Screen/Keyboard. Scroll down and you will see trackpad, and under it three user-adjustable fields. Click the Horizontal Sensitivity or Vertical Sensitivity field (70 is the default) and change it. Higher is more sensitive, lower is less. Click in the Audible Roll field to set Click or Mute. Click will produce an audible click when you move the trackpad, and Mute makes trackpad movement silent. Press the Menu key and select Save. TIP: You may find that your trackpad moves too quickly up or down lines. If so, then reduce the Vertical Sensitivity to 50 or lower.

Microsoft (R) C/C++ Optimizing Compiler Version 14.00.50727.42 for Microsoft (R) .NET Framework version 2.00.50727.42 Copyright (C) Microsoft Corporation. All rights reserved. string_array_stack_semantics.cpp string_array_stack_semantics.cpp(7) cannot use this type here without a string_array_stack_semantics.cpp(8) cannot use this type here without a with [ Type=int ]

The selectivity on column = :bind is still 1 / num_distinct, the selectivity on ranges are still 5% and 025% for unbounded and bounded ranges The CBO is better at spotting that range predicates fall outside the low/high values when there are histograms in place..

Below we have a number of typing tips to help you get more proficient with your Curve. Be sure to check out the Quick Start Guide at the beginning of this book for even more tips and tricks as well as many images to help understand some of the topics covered in this chapter.