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The adjusted dbf_mbrc is significant, because a little further experimentation shows that the cost of a tablescan when using the traditional costing methods is (blocks below high water mark / adjusted dbf_mbrc). If you do a tablescan of a 23,729 block table with a db_file_multiblock_read_count of 32, then the cost of the tablescan will be reported as ceil(23,729 / 16.39); if you do a tablescan of a 99-block table with a db_file_multiblock_read_count of 64, then the cost of the tablescan will be ceil(99 / 25.84). There will be small rounding errors, of course if you want a more accurate set of figures, create a very large table (or fake it by using the procedure dbms_stats.set_table_stats to claim that your test table is 128,000,000 blocks). It doesn t matter what your standard block size is (although, as you will see, you have to fiddle with the formula when you start working with nonstandard block sizes), there is just one reference set of values that Oracle uses to calculate the cost of a tablescan. The online code suite includes a script called calc_mbrc.sql that can generate the full set of values for the adjusted dbf_mbrc. If you run this script, you will find that there is a point beyond which the adjusted dbf_mbrc will not change. When Oracle starts up, it negotiates with the operating system to find the largest physical read size your operating system will allow, and silently uses that to limit whatever value you set for the db_file_multiblock_read_count.

Like the classic C++ #include directive, the #using directive is used in a source code file to refer to an assembly (usually a DLL) that defines programming elements that you want to use in your program. The act of putting a #using directive for a particular assembly in your code is called referencing the assembly. Once an assembly is referenced in this way, you ll be able to use any publicly exposed classes, interfaces, and other program elements defined in that assembly. The types in mscorlib.dll are referenced by default, so there is no need for the #using directive to reference anything in this assembly. If there s a question as to whether a particular type is in mscorlib.dll, use ILDasm.exe on mscorlib.dll (you can find mscorlib.dll in the .NET Framework installation folder). In mixed code, ways of accessing native libraries remain the same. If COM libraries are used, use the #import directive as you would normally. Header files are not used for referencing managed types outside of the assembly where they live, but the #include directive is still used to reference headers written in classic C++ and for intra-assembly code (for example, in a Visual Studio project). Types, assembly-level global functions, and other symbols are defined in assemblies and may or may not be accessible outside that assembly, depending on accessibility modifiers declared on the symbol. Accessibility modifiers are slightly different in C++/CLI, as you ll see in 6. For now just know that you can use public or private on types and assembly-global

Figure 3-6. Media Sync options (device).

In general, when a table or index segment is first created, space for that segment will be preallocated from a data file but very little of the space will be formatted for use. As data arrives, blocks will be formatted a few at a time. In the simplest setup, Oracle would format the next five blocks from the preallocated space as the need arose, and the object s high water mark (HWM) would be adjusted to show how many blocks had been formatted and were available for use. With the arrival of ASSM in 9i, Oracle formats groups of adjacent blocks (typically 16, it seems) at a time. The high water mark still identifies the highest formatted block in the segment, but ASSM randomizes the allocation slightly, so that unformatted holes (16 blocks, or multiples thereof) can appear in the middle of the object. ASSM also allocates one or two bitmap space management blocks per extent. So the object is larger, and the cost of a tablescan is pushed upwards for large objects the difference is not huge, but there are other side effects to consider, as you will see in later chapters.

After your initial Configure Settings screen is complete, you should then see a screen similar to the one shown in Figure 3-7.