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Note that the second SM Join calculation will only appear if the indexed access path had not already been selected as the cheapest way of acquiring the first data set anyway modify the example to select only 1,000 rows rather than 9,000 rows from the first table, and the no-sort option is selected automatically and you will notice that the execution plan then shows a sort line only for the second table. Execution Plan (9.2.0.6 autotrace) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=53 Card=1 Bytes=14) 1 0 SORT (GROUP BY) 2 1 VIEW (Cost=53 Card=999 Bytes=13986) 3 2 MERGE JOIN (Cost=53 Card=999 Bytes=29970) 4 3 TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=22 Card=1000 Bytes=15000) 5 4 INDEX (RANGE SCAN) OF 'T1_PK' (UNIQUE) (Cost=4 Card=1000) 6 3 SORT (JOIN) (Cost=31 Card=1000 Bytes=15000) 7 6 TABLE ACCESS (BY INDEX ROWID) OF 'T2' (Cost=22 Card=1000 Bytes=15000) 8 7 INDEX (RANGE SCAN) OF 'T2_PK' (UNIQUE) (Cost=4 Card=1) Even when the optimizer selects a no-sort merge, you will find that the cost of the merge join is still (very close to) the sum of the two separate accesses to the table. In this case, you can see that the cost at line 3 is the sum of the costs at lines 4 and 6 (53 = 22 + 31).

Begin typing in a contact name (as you did when selecting an e-mail recipient in 7). When you find the contact, click the Trackpad.

Scroll::GameObjectRead Scroll::Read By specifying the function you are overriding, you can use a different name for the override, saving the Read name for your Scroll class s functionality.

In 6, we came across an example where the optimizer used transitive closure to turn a perfectly reasonable join into a Cartesian merge join. And I mentioned at the time that the cost of the join was a little surprising. It s time to take a look at what has happened in this case (see script cartesian.sql in the online code suite):

If the contact has multiple phone numbers, the BlackBerry will ask you to choose a number. Click the number you desire to use.

Table t1 has 800 rows, and table t2 has 1,000 rows In both tables, one-tenth of the rows have n1 = 5 This is the execution plan for the preceding query taken from view v$sql_plan_statistics after using the alter session command to set the parameter _rowsource_execution_statistics to true (You can get the same view populated by setting statistics_level to all, or sql_trace to true The hidden parameter is just more precisely targeted but obviously should not be used on production systems) Id Starts Rows Plan (920.

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In classic C++, an abstract class is any class that contains one or more pure virtual methods. C++\CLI has the same concept, but instead of being implicit, you explicitly declare such a class with the abstract keyword. As in classic C++, abstract classes in C++/CLI cannot be instantiated; they are usually used as base classes. Individual methods may be declared abstract in two ways in the old way using the pure specifier (that funny = 0 appended after the function prototype), or using the abstract contextual keyword on the function; that is, virtual void f() = 0; is the equivalent of virtual void f() abstract; If you do declare any function in a class abstract using either syntax just described, it makes the class abstract, but it does not require that the class be declared as such. However, you can also declare a class or structure abstract even if it doesn t have any abstract methods. Derived classes of abstract classes may themselves be abstract, but the first nonabstract class in the hierarchy will have to provide an implementation or have inherited an implementation for all the abstract methods inherited from abstract base classes (and, as you will see in the next chapter, any abstract methods from interfaces, too). Listing 8-8 shows an example. Listing 8-8. Declaring Abstract Classes // abstract_classes.cpp // Notice that the abstract keyword follows the class name. ref class GameObject abstract { int ID; public: // an abstract method with no implementation // provided virtual void ReadFromFile() abstract;

6 - v$sql_plan_statistics) -- ------ ------ ------------------------------------------------0 SELECT STATEMENT (all_rows) Cost (324,,) 1 1 1 SORT (aggregate) 2 1 8,000 MERGE JOIN (cartesian) Cost (324,8000,112000) 3 1 80 TABLE ACCESS (analyzed) T1 (full) Cost (4,80,560) 4 80 8,000 BUFFER (sort) Cost (320,100,700) 5 1 100 TABLE ACCESS T2 (full) Cost (4,100,700) The three figures in brackets at the end of each line are the (cost, cardinality, and bytes) respectively and as you can see, the cost of the merge join (line 2) is 324, which seems to be the cost of the table scan in line 3 plus the cost of the buffer (sort) in line 4.