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Remember how 8i underestimated the cardinality of an in-list. We expected a cardinality of 300 from month_no in (6,7,8) but got a cardinality of 276. When you expand the formula for the selectivity of two predicates OR ed together to cover three predicates, it looks like this: sel(A or B or C) = sel(A) + sel(B) + sel(C) Sel(A)sel(B) Sel(B)sel(C) sel(C)sel(A) + Sel(A)Sel(B)Sel(C) The individual selectivity for each month is 1/12, but put 1/12 into the preceding formula, and the answer is: 3/12 3/144 + 1/1728 = 0.22975. Multiply this by the 1,200 rows we started with and the answer is 275.69 the cardinality given by 8i. Oracle s error in 8i was that it used the general method for handling OR ed predicates when it expanded in-lists; it didn t recognize the special case. It s a common feature in the optimizer many of the enhancements that appear in newer versions are the result of special cases being recognized, and being treated more appropriately. Enhancements are a good thing but anything that changes the cardinality of an operation (even to correct it) may cause an execution plan to change unexpectedly.

There are a few simple steps you can take to ensure that your BlackBerry will always be working no matter where you might be in the world.

Listing 12-11 Using Win32 Functions in a Managed Class // interop_messageboxcpp #include <windowsh> #include <vcclrh> // for PtrToStringChars using namespace System; public ref class MessageBoxClass { public: property String^ Message; property String^ Caption; int DisplayBox() { // Use pinning pointers to lock down the data while it's being // used in native code pin_ptr<const wchar_t> message = PtrToStringChars(Message); pin_ptr<const wchar_t> caption = PtrToStringChars(Caption); return MessageBoxW( 0, message, caption, MB_OK); } }; int main() { MessageBoxClass m; mMessage = "Managed string used in native function"; mCaption = "Managed Code using Win32 Message Box"; mDisplayBox(); } In Listing 12-11, we use the Unicode form of the MessageBox function, MessageBoxW, since we re starting with a Unicode string We start to see some more complex operations as we marshal the managed String type to a native LPCWSTR parameter LPCWSTR is a typedef for const wchar_t*.

Notice particularly that the same query with different inputs could mean that the standard cardinality estimate is too high (Aries and December) or too low (Aries and April). This means the problem of dependencies, particularly between columns in a single table, is not one that can be solved automatically. 9i offers dynamic sampling as a partial solution, and 10g offers profiles we will take a further look at both options in 6. But since the error in cardinality could go either way on exactly the same input text, the only complete solution requires Oracle to optimize for each set of input values as they appear by sampling the data. This may be feasible in a data warehouse environment, but is not viable in a high-performance OLTP system because of the extra resource consumption and contention issues that would inevitably appear.

Step 1: Check to see if you have a SIM card inserted If you are traveling to a country where you will need to connect to a GSM network, then you will need to have a SIM card in your BlackBerry Most times, with an 8520 Curve, you will already have a SIM card pre-inserted by the phone company You can check that you have a SIM card by clicking on the Options Icon Then select Advanced Options Finally, tap the letter S a couple times to jump down to SIM Card and click on it If you see a screen that says: SIM Card: No Valid SIM Card, then you do not have a SIM card or your SIM card is not inserted correctly You can also quickly check if you have a SIM Card, by removing the back cover of your BlackBerry and taking a look.

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