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You cannot simply call GetLastError via P/Invoke after a Windows API call and expect to get the error code corresponding to the Win32 function invoked on the last P/Invoke call, because there is no guarantee that between the function call of interest and the call to GetLastError any error value is preserved. The proper way to get at the error code is to call Marshal::GetLastWin32Error, as shown in Listing 12-23. Listing 12-23. Handling Win32 Error Codes // getlasterror.cpp #using "System.dll" using namespace System; using namespace System::ComponentModel; // for Win32Exception using namespace System::Runtime::InteropServices; [DllImport("kernel32.dll", SetLastError=true)] extern bool SetVolumeLabel(String^ lpRootPathName, String^ lpVolumeName);

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When you start experimenting with indexes, you may find that the numbers don t work quite correctly The optimizer might use various adjustments in different circumstances that result in the calculations being off by plus or minus one We have already noted that there are variations between the versions of the Oracle (and sometimes within a version) about the use of round() and ceil() It took me a long time to notice this because all my test cases just happened to produce results where round() and ceil() gave the same result The moral is that you should never assume that you have worked out exactly what s going on; a good approximation is as close as you can ever get.

But just when you think you re close enough, you discover that there really isn t a formula, there is only a decision tree, with different formulae at the end at each of the branches Here are a couple of common cases that may cause a variation between the baseline formula and the actual result: For unique indexes, or nonunique indexes supporting unique or primary key constraints, the optimizer uses the standard formula, and then subtracts 1 However, in the case of a nonunique index supporting a unique or primary key constraint, this adjustment is not made if the constraint is deferrable So be careful you may be tempted to make all your constraints deferrable just in case, but there are small side effects that may cause execution plans to change.

In this chapter, we talk all about security and securing your BlackBerry data. Most of us keep very important information on our devices and would want to be prepared, just in case.

bool TestGetLastWin32Error() { if (SetVolumeLabel("BAD:\\", "VolumeName")) { System::Console::WriteLine("Success!"); return true; } else { throw gcnew Win32Exception(Marshal::GetLastWin32Error()); } return false; } int main() { try { TestGetLastWin32Error(); } catch(Win32Exception^ e) { Console::WriteLine(e->ToString()); } } The output of Listing 12-23 is as follows: System.ComponentModel.Win32Exception: The filename, directory name, or volume label syntax is incorrect at TestGetLastWin32Error() at main()

Indexes where the blevel is set to 1 (so the index goes straight from the root block to the leaf blocks) The optimizer effectively ignores the blevel if every column in the index appears in an equality predicate This is an interesting case, as a root block split (which could happen because just one row in the table has been updated) would then push the cost of the index up by two which could change the access path This is just one of many clues that small tables can be more important than large tables when you want to solve optimizer problems..

Would you be uncomfortable if someone found and easily accessed all the information on your device For most of us the answer would be YES! On many of our BlackBerry smartphones, we store friends and colleagues names, addresses, phone numbers, confidential e-mails, and notes. Some of our devices may even contain Social Security numbers, passwords, and other important information in your contact notes or your MemoPad. In that case, you will want to enable or turn on the Password Security feature. When you turn this on, you will need to enter your own password in order to access and use the BlackBerry. In many larger organizations, you do not have an option to turn off your password security; it is automatically turned on by your BlackBerry Enterprise Server Administrator.