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In the absence of the system statistics, the optimizer estimated that the index-based path would visit 68 blocks individually for a total of 68 I/O requests, compared to 1 + ( 371 / 6.59 ) for the tablescan. (Remember that for tablescans and index fast full scans, and ignoring ASSM tablespaces, the optimizer divides the high water mark by an adjusted value of the db_file_multiblock_read_count.) When we enable system statistics, the optimizer decides that the cost for the indexed path is still 68 for the I/O component, plus a small extra cost to cater to the CPU cost of acquiring blocks, and making a few data comparisons.

You might try implementing an isotope table as a sparse array a data structure that can be used like an array but is a hashtable underneath so as to avoid storing space for unused elements The implementation of such a collection type would probably be a template in classic C++ In C++/CLI, it could be a template or it could be another type of parameterized type, a generic type, which the next section describes..

From this Advanced settings screen, you can perform any of the following actions: Map Folder Conflict Resolution Filters Field Mapping

One of the most important features of system statistics (or CPU costing) is that it allows the optimizer to balance the costs of single-block and multiblock reads properly by scaling up the cost of a multiblock read. As an early fix to this imbalance, the parameter optimizer_index_cost_adj appeared in 8i. In effect, this parameter appeared to be a percentage that would be used to scale down the cost of single block reads compared to multiblock reads. (See Tim Gorman s paper The Search for Intelligent Life in the Cost Based Optimizer at www.evdbt.com for the first useful paper published about this parameter.) The flaw built into this fix was that it reduced the cost of single block reads, rather than increasing the cost of multiblock reads. On the plus side, this did tend to stop the optimizer from using excessive tablescans. On the minus side, the rounding built into the calculations could cause the optimizer to switch from a good index to a bad index, because their costs became identical after adjustment and rounding. When you scale down, rounding errors become more significant.

The Map Folder function allows you to select one or several folders to map from your desktop app to sync your BlackBerry. There are several Outlook folders from which to choose in order to map to sync the Calendar to the BlackBerry (see Figure 2-14). 1. 2. 3. 4. Use the Plus signs (+) in the right column to expand or collapse the views (see Figure 2-13 below). Select individual items (such as Calendar) from the left by clicking them. Click the Add button in the middle to add this item to the sync. To remove a selected item from the sync, click it in the right column and click the Remove button in the middle.

The cost for the tablescan path changes more dramatically when we switch to CPU costing. To work out the I/O cost component, we divide the high water mark by the actual stored MBRC, and round up: ceiling(371/8) = 47. Then we double it, because our mreadtim is twice our sreadtim, to get 94. We then add a little for the amount of CPU that will be used examining every row of the table. The upshot of this is that if your system statistics really do represent the typical behavior of your system, then the cost based optimizer can produce a cost that is a more realistic reflection of actual resource usage and time to completion before it starts running the query.

__except( filter_div0(GetExceptionCode(), GetExceptionInformation())) { printf_s("Divide by zero exception caught via SEH __except block."); } } #pragma managed int main(array<String^>^ args) { if (args->Length < 1) { Console::WriteLine("Usage: try_except [NET|SEH|AV]"); return -1; } if (args[0] == "NET") // Demonstrate catching SEH as a .NET Exception { try { generate_SEH_exception(); } catch(DivideByZeroException^ e) { Console::WriteLine(e->ToString()); } } else if (args[0] == "SEH") // Demonstrate handling SEH exception natively. { // Call native function with try/except block // and filter out division by zero exceptions. try_except(false); } else if (args[0] == "AV") // Demonstrate filtering of what exceptions to handle // natively and what to allow through. { try { // AVs, however, are not filtered and are allowed // to propagate to managed code. try_except(true); } catch(AccessViolationException^ e) { Console::WriteLine(e->ToString()); } } }