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table partition segments, and a composite partitioned table is made up of one or more table subpartition segments. Index: This segment type holds an index structure. Index partition: Similar to a table partition, this segment type contains some slice of an index. A partitioned index consists of one or more index partition segments. Lob partition, lob subpartition, lobindex, and lobsegment: The lobindex and lobsegment segments hold the structure of a large object, or LOB. When a table containing a LOB is partitioned, the lobsegment will be partitioned as well the lob partition segment is used for that. It is interesting to note that there is not a lobindex partition segment type for whatever reason, Oracle marks the partitioned lob index as an index partition (one wonders why a lobindex is given a special name!). Nested table: This is the segment type assigned to nested tables, a special kind of child table in a master/detail relationship that we ll discuss later. Rollback and Type2 undo: This is where undo data is stored. Rollback segments are those manually created by the DBA. Type2 undo segments are automatically created and managed by Oracle.

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So, for example, a table may be a segment An index may be a segment I stress the words may be because we can partition an index into separate segments So, the index object itself would just be a definition, not a physical segment and the index would be made up of many index partitions, and each index partition would be a segment A table may be a segment or not For the same reason, we might have many table segments due to partitioning, or we might create a table in a segment called a cluster Here the table will reside, perhaps with other tables in the same cluster segment The most common case, however, is that a table will be a segment and an index will be a segment This is the easiest way to think of it for now.

Table 10-1. DLLs Containing the Library Constructs Referred to in This (Continued)

When you create a table, you are normally creating a new table segment and, as discussed in 3 Files, that segment consists of extents, and extents consist of blocks This is the normal storage hierarchy But it is important to note that only the common case has this one-to-one relationship For example, consider this simple CREATE TABLE statement: Create table t ( x int primary key, y clob, z blob ); This statement creates six segments, assuming Oracle Database 11g Release 1 and before; in Oracle Database 11g Release 2 and above, segment creation is deferred until the first row is inserted by default (we ll use syntax to have the segments created immediately below).

If you issue this CREATE TABLE statement in a schema that owns nothing, you ll observe the following: ops$tkyte%ORA11GR2> select segment_name, segment_type 2 from user_segments; no rows selected ops$tkyte%ORA11GR2> ops$tkyte%ORA11GR2> Create table t 2 ( x int primary key, 3 y clob, 4 z blob ) 5 SEGMENT CREATION IMMEDIATE 6 /.

Minimal constructs for F# assemblies. Called fslib.dll in earlier versions of F#. Called mllib.dll in earlier versions of F#.

The second procedure constructs a unique SQL statement for each row to be inserted: ops$tkyte%ORA11GR2> create or replace procedure proc2 2 as 3 begin 4 for i in 1 .. 10000 5 loop 6 execute immediate 7 'insert into t values ( '||i||')'; 8 end loop; 9 end; 10 / Procedure created. Now, the only difference between the two is that one uses a bind variable and the other does not. Both are using dynamic SQL and the logic is identical. The only difference is the use of a bind variable in the first. We are ready to evaluate the two approaches and we ll use runstats, a simple tool I ve developed, to compare the two in detail:

Note For details on runstats and other utilities, please see the appendix on Tools & Scripts used in this book.

All of these DLLs except System.Query.dll are referenced automatically from F# projects. To reference additional DLLs, you can embed a reference directly into your source code. For example: #I @"C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5;; #r "System.Query.dll";; The first line specifies an include path, the equivalent of the -I command-line option for the F# compiler. The second line specifies a DLL reference, the equivalent of the -r commandline option. We described these in 7. If you re using Visual Studio, you can adjust the project property settings for your project.

ops$tkyte%ORA11GR2> exec runstats_pkg.rs_start PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> exec proc1 PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> exec runstats_pkg.rs_middle PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> exec proc2 PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> exec runstats_pkg.rs_stop(10000) Run1 ran in 65 cpu hsecs Run2 ran in 1224 cpu hsecs run 1 ran in 5.31% of the time

Note You may not observe exactly the same values for cpu, nor in fact for any metric, as I report here.

Note Hundreds of high-quality frameworks and libraries are available for .NET, and more are appearing all the time. For space reasons, this chapter covers only the .NET libraries and frameworks listed in Table 10-1. In the Some Other .NET Libraries section of this chapter, we list some libraries you might find interesting, and you can see more resources for finding .NET libraries at http://www.expert-fsharp/Topics/ Libraries.