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The sealed modifier may be applied to methods, classes, or structs. Methods marked sealed may not be overridden by derived classes. Classes and structs marked sealed cannot be inherited from. The syntax for a sealed class is as in Listing 8-9.

Some BlackBerry devices have a pre-loaded Birthday.mms in this folder. Click on the Birthday MMS, if you have it. 5. Then type in the recipient in the To: field, scroll to the appropriate contact, and click. You can add a subject and text in the body of the MMS. When finished, just click the trackpad and select Send.

Earlier on in the chapter, I pointed out that you will often see that the Total IO sort cost is (Blocks to Sort + IO Cost per pass) / 2: in this example this would be (10 + 19) / 2, which would be reported as 15 But the Total IO sort cost is reported as 11 Something has changed (In 8i, and allowing for the small changes due to rounding errors, etc, you would see the equivalent of 15 as the total I/O sort cost) The difference is interesting from 9i onwards, the cost has been adjusted to allow for the fact that the number of rows returned by the query is less than the total number of rows in the.

6. 7.

table. It seems that in general, the IO cost per pass is total volume of input data + total volume of output data. The value 19 is Input in blocks + output in blocks = Input Rows * Row size / blocksize + output Rows * Row size / blocksize = 5,000 * 15 / 8192 + 5,000 * 15 / 8192 = 18.3105 -- which rounds up to 19. But in our grouping case, the optimizer has decided that the grouping cardinality is 1,256, so the result changes: 5,000 * 15 / 8192 + 1,256 * 15 / 8192 = 11.455 -- which rounds up to 12

Listing 8-9. Sealed Class Syntax // sealed.cpp ref class C sealed { }; ref class B : C // Error: cannot inherit from a sealed class. { }; Value classes are implicitly sealed; the use of sealed in the class declaration is not an error, although it is not necessary. Like abstract, the sealed modifier may also be used on an individual function. A sealed type indicates that all the functions in the class are sealed, but when used on an individual function, sealed indicates that only that function cannot be overridden. Derived classes can use new on a sealed base class function; however, they may not use override. If you use new on a sealed base class function, you are creating a totally unrelated method. The abstract or sealed modifiers apply to individual overloads of overloaded functions. Thus, one of a series of function overloads may be sealed, but this does not prevent the other overloads from being overridden in derived classes.

There are lots of template MMS files you can download from the web and put into this folder to be selected in the future.

Put that 12 into the normal formula (for a one merge pass sort): (blocks to sort + IO Cost per pass) / 2 = (10 + 12) / 2 = 11 So in this case, the 10053 trace is showing us one figure for the IO Cost per pass (19) and using another (12) to calculate the Total IO sort cost. It seems the trace file has not caught up with the new feature. There is a trap to watch out for here if you are still waiting to upgrade. If you have complex queries that use aggregate functions to crunch large numbers of rows down to small result sets, then this particular cost change may make a significant difference to the cost of some parts of those queries which may change the overall execution plan. This simple example showed a change on a single table aggregation from 18 down to 14 (because the grouping cost dropped from 15 down to 11) on the upgrade. This was on a query that crunched 5,000 rows down to 1,256. The difference on a query that reduced a 100,000-row input to a 100-row output could be much more dramatic.