Simple .NET/ASP.NET PDF document editor web control SDK

This is because an index is a complex data structure that isn t randomly organized like a heap, so data must go where it belongs Unlike a heap, where blocks are sometimes available for inserts, blocks are always available for new entries in an index If the data belongs on a given block because of its values, it will go there regardless of how full or empty the block is Additionally, PCTFREE is used only when the object is created and populated with data in an index structure It is not used like it is in the heap organized table PCTFREE will reserve space on a newly created index, but not for subsequent operations on it, for much the same reason as PCTUSED is not used at all The same considerations for FREELISTs we had on heap organized tables apply in whole to IOTs.

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First, let s look at the NOCOMPRESS option This option is different in implementation from the table compression discussed above It works for any operation on the index organized table (as opposed to the table compression which may or may not be in effect for conventional path operations) Using NOCOMPRESS, it tells Oracle to store each and every value in an index entry (ie, do not compress) If the primary key of the object were on columns A, B, and C, every occurrence of A, B, and C would physically be stored The converse to NOCOMPRESS is COMPRESS N, where N is an integer that represents the number of columns to compress This removes repeating values and factors them out at the block level, so that the values of A and perhaps B that repeat over and over are no longer physically stored.

GUIDs are often displayed during software installation and are familiar for their mysterious syntax of a sequence of hexadecimal digits enclosed in curly braces These GUIDs are also used to identify COM classes; these IDs are known as CLSIDs and are stored in the Windows registry as subkeys containing further metadata about the COM object When CreateObject is invoked, the code infrastructure looks for the key: HKEY_CLASSES_ROOT\WordApplication\CLSID The default value for the key in this example (on one of our computers) is as follows: {000209FF-0000-0000-C000-000000000046} Now you can access the registry key defining the COM component and find all the information relative to the component The following screenshot shows the content of the LocalServer32 subkey, where it says that winwordexe is the container of the WordApplication component.

Consider, for example, a table created like this: ops$tkyte%ORA11GR2> create table iot 2 ( owner, object_type, object_name, 3 primary key(owner,object_type,object_name) 4 ) 5 organization index 6 NOCOMPRESS.

/ Table created. It you think about it, the value of OWNER is repeated many hundreds of times. Each schema (OWNER) tends to own lots of objects. Even the value pair of OWNER,OBJECT_TYPE repeats many times, so a given schema will have dozens of tables, dozens of packages, and so on. Only all three columns together do not repeat. We can have Oracle suppress these repeating values. Instead of having an index block with values shown in Table 10-1, we could use COMPRESS 2 (factor out the leading two columns) and have a block with the values shown in Table 10-2. Table 10-1. Index Leaf Block, NOCOMPRESS Sys,table,t1 Sys,table,t5 Sys,table,t100 Sys,table,t2 Sys,table,t6 Sys,table,t101 Sys,table,t3 Sys,table,t7 Sys,table,t102 Sys,table,t4 Sys,table,t8 Sys,table,t103

If a COM component should be executed in a process different from that of the creator, LocalServer32 contains the location of the executable Components are often loaded in-process in the form of a DLL, and in this case it is the InprocServer32 key that indicates the location of the library..

Table 10-2. Index Leaf Block, COMPRESS 2 Sys,table t4 t300 t1 t5 t103 t301 t2 t104 t302 t3 t303

To get a feel for the number of COM components installed on a Windows system, you can use a few lines of F# using fsi.exe as a shell: > open Microsoft.Win32;; > let k = Registry.ClassesRoot.OpenSubKey("CLSID");; val k : RegistryKey > k.GetSubKeyNames().Length;; val it : int = 9237 > k.Close();; val it : unit = () The registry is also responsible for storing information (that is, the metadata associated with COM components that describes their interfaces) about type libraries. Type libraries are also described using registry entries and identified by GUIDs available under the registry key: HKEY_CLASSES_ROOT\TypeLib