.NET/ASP.NET/C#/VB.NET PDF Document SDK

4 value number, 5 change number, 6 high number, 7 low number, 8 vol number, 9 primary key(ticker,day) 10 ) 11 organization index 12 / Table created I frequently look at one stock at a time for some range of days (eg, computing a moving average) If I were to use a heap organized table, the probability of two rows for the stock ticker ORCL existing on the same database block are almost zero This is because every night, I insert the records for the day for all of the stocks This fills up at least one database block (actually, many of them) Therefore, every day I add a new ORCL record, but it is on a block different from every other ORCL record already in the table.

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If I query as follows Select * from stocks where ticker = 'ORCL' and day between sysdate-100 and sysdate; Oracle would read the index and then perform table access by rowid to get the rest of the row data Each of the 100 rows I retrieve would be on a different database block due to the way I load the table each would probably be a physical I/O Now consider that I have this same data in an IOT That same query only needs to read the relevant index blocks, and it already has all of the data Not only is the table access removed, but all of the rows for ORCL in a given range of dates are physically stored near each other as well Less logical I/O and less physical I/O is incurred Now you understand when you might want to use IOTs and how to use them.

Reflection: The component description available at run time allows programs to deal with unknown components; this is especially important for programs featuring scripting environments as witnessed by the widespread use of IDispatch and type libraries in COM..

What you need to understand next is what the options are with these tables What are the caveats The options are very similar to the options for a heap organized table Once again, we ll use DBMS_METADATA to show us the details Let s start with the three basic variations of the IOT: ops$tkyte%ORA11GR2> create table t1 2 ( x int primary key, 3 y varchar2(25), 4 z date 5 ) 6 organization index; Table created ops$tkyte%ORA11GR2> create table t2 2 ( x int primary key, 3 y varchar2(25), 4 z date 5 ) 6 organization index 7 OVERFLOW; Table created ops$tkyte%ORA11GR2> create table t3 2 ( x int primary key, 3 y varchar2(25),.

4 5 6 7

COM components are compiled modules that conform to well-defined protocols designed to allow binary interoperability among different languages An essential trait of component architectures is the ability to dynamically create components at run time It is necessary for an infrastructure to locate and inspect components in order to find and load them The Windows registry holds this information, which is why it is such an important structure in the operating system The HKEY_CLASSES_ROOT registry key holds the definition of all the components installed on the local computer It is helpful to understand the basic layout of the registry in this respect when dealing with COM components The following is a simple script in Jscript executed by the Windows Scripting Host, which is an interpreter used to execute Visual Basic and Jscript scripts on Windows: w = WScriptCreateObject("WordApplication"); wVisible = true; WScriptEcho("Press OK to close Word"); w.

z date ) organization index overflow INCLUDING y;

Table created We ll get into what OVERFLOW and INCLUDING do for us, but first let s look at the detailed SQL required for the first table: ops$tkyte%ORA11GR2> select dbms_metadataget_ddl( 'TABLE', 'T1' ) from dual; DBMS_METADATAGET_DDL('TABLE','T1') ------------------------------------------------------------------------------CREATE TABLE "OPS$TKYTE""T1" ( "X" NUMBER(*,0), "Y" VARCHAR2(25), "Z" DATE, PRIMARY KEY ("X") ENABLE ) ORGANIZATION INDEX NOCOMPRESS PCTFREE 10 INITRANS 2 MAXTRANS 255 LOGGING STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "USERS" PCTTHRESHOLD 50 This table introduces a new option, PCTTHRESHOLD, which we ll look at in a moment You might have noticed that something is missing from the preceding CREATE TABLE syntax: there is no PCTUSED clause, but there is a PCTFREE.

Quit(); This simple script creates an instance of a Microsoft Word application and shows programmatically its window by setting the Visible property to true Assuming that the script is executed using the wscript command (the default), its execution is stopped until the message box displayed by the Echo method is closed, and then Word is closed How can the COM infrastructure dynamically locate the Word component and load without prior knowledge about it The COM infrastructure is accessed through the ubiquitous CreateObject method that accepts a string as input that contains the program ID of the COM component to be loaded This is the human-readable name of the component, but the COM infrastructure was conceived as a foundation of a potentially large number of components and therefore adopted the global unique identifier (GUID) strings to define components.