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The proper date column has produced the right answer (nearly); the error is the usual one of the optimizer using arithmetic appropriate to continuously varying values when we are really handling a relatively small list of discrete values Oracle understands what dates are, what they mean, and how to do arithmetic with them But what s gone wrong with the numeric and character versions Nothing, really we ve just hidden from the optimizer the fact that they are really holding dates, so the optimizer has used the standard arithmetic on a data set that is a little peculiar Remember the standard formula for a range in this case using the version that is closed at both ends (between is a short-hand for '>= X and <= Y').

ref struct Base { virtual void F(int i) { /* body */ } }; ref struct Derived : Base { virtual void F() sealed { /* body */ } };

If you have made a mistake, click Back to return to the previous screen. Otherwise click the Finish button to execute the listed actions. While the software is working, you will see a status window (see Figure 2-31).

Let s apply it for the numeric case: Selectivity = (required range) / (high value - low value) + 2/num_distinct = (20030105 - 20021230) / (20041231 - 20000101) + 2/1827 = 8875 / 41130 + 2/1827 = 0215779 + 0001095 = 0216874 -- more than 20% of the data apparently! To finish things off, multiply the selectivity by the number of rows in the table (1,827) and we get 1,827 * 0216874 = 396228 The optimizer doesn t know that we are dealing with dates, so although we see numbers that we can recognize as a date range that crosses a month boundary or a year boundary, the optimizer doesn t see this as the next day, it simply sees a huge gap and we haven t given the optimizer any information about gaps It s inevitable that the arithmetic will go wrong.

In some cases, this process can be very fast taking just a minute or so. However in other cases, especially if you are updating the system software or any part of it (like adding or removing core dictionaries), you will see a message that This task might take up to 30 minutes to complete. In our testing, the process took about six minutes, but it felt like 30 minutes!

To make it easier to show that the value of 457 reported for the character types in older versions is following the standard formulae, I created a PL/SQL function to apply the conversion algorithm I described earlier on in the chapter (see script char_funsql in the online code suite) Consequently, I can just run the following SQL statement to work out the cardinality:.

interface class I { int F(int i, String^ s); void g(); }; ref class R : I { public: virtual int F(int i, String^ s) { /* implement I::F */ } virtual void g() { /* implement I::g */ } };

Just as an indication of how hard it is to keep track of what s going on with subqueries, and what special effects might, or might not, work, I ve produced a little table of the parameters, Table 9-1, relating to subquery transformation. (I may have missed a few sometimes the names and descriptions don t give much of a clue to purpose.)

Have patience while this is happening. If you disconnect your BlackBerry from your computer while this reboot is happening, your BlackBerry might become unusable. 10. When the process is finished, you should see a small status message in the upper left corner (see Figure 2-32).

Unnests not exists subquery with one or more tables if possible. Enables unnesting of correlated subqueries. Enable ordered semi-join (exists) subquery. Enables costing of equality semi-join (exists). Always use this method for anti-join (not exists) when possible. Always use this method for semi-join (exists) when possible. Forces correct computation of subquery selectivity. Enables unnesting of subqueries in a bottom-up manner.