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Figure 12-2. Hello World stored in a CHAR(80) The fact that a CHAR/NCHAR is really nothing more than a VARCHAR2/NVARCHAR2 in disguise makes me of the opinion that there are really only two character string types to ever consider, namely VARCHAR2 and NVARCHAR2. I have never found a use for the CHAR type in any application. Since a CHAR type always blank pads the resulting string out to a fixed width, we discover rapidly that it consumes maximum storage both in the table segment and any index segments. That would be bad enough, but there is another important reason to avoid CHAR/NCHAR types: they create confusion in applications that need to retrieve this information (many cannot find their data after storing it). The reason for this relates to the rules of character string comparison and the strictness with which they are performed. Let s use the 'Hello World' string in a simple table to demonstrate: ops$tkyte@ORA11GR2> create table t 2 ( char_column char(20), 3 varchar2_column varchar2(20) 4 ) 5 / Table created. ops$tkyte@ORA11GR2> insert into t values ( 'Hello World', 'Hello World' ); 1 row created.

You can automate the load process, so it runs at scheduled times You can load complex object-relational data You can use the SQL*Loader utility to perform several types of data loading: Conventional data loading: Under conventional data loading, SQL*Loader reads multiple rows at a time and stores them in a bind array SQL*Loader subsequently inserts this whole array at once into the database and commits the operation Direct-path loading: The direct-path loading method doesn t use the SQL INSERT statement to load the data into Oracle tables Column array structures are built from the data to be loaded, and these structures are used to format Oracle data blocks that are then written directly to the database tables External data loading: The new external tables feature of Oracle relies on the functionality of SQL*Loader to access data in external files as if it were part of the database tables.

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When you use the ORACLE_LOADER access driver to create an external table, you are basically using the SQL*Loader s functionality In Oracle Database 11g, you can also use the new ORACLE_DATAPUMP access driver, which provides the ability to write to external tables The conventional and direct-path loading methods offer their own benefits and drawbacks Because the direct-path loading method bypasses the Oracle SQL mechanism, it is much faster than the conventional loading method However, when it comes to the data transformation capabilities, the conventional loading method is much more powerful than direct-path loading, because it allows a.

Note When I say syntactically supports, I mean that a CREATE statement may use these datatypes,

ops$tkyte@ORA11GR2> select * from t; CHAR_COLUMN VARCHAR2_COLUMN -------------------- -------------------Hello World Hello World ops$tkyte@ORA11GR2> select * from t where char_column = 'Hello World'; CHAR_COLUMN VARCHAR2_COLUMN -------------------- -------------------Hello World Hello World ops$tkyte@ORA11GR2> select * from t where varchar2_column = 'Hello World'; CHAR_COLUMN VARCHAR2_COLUMN -------------------- -------------------Hello World Hello World So far, the columns look identical but, in fact, some implicit conversion has taken place and the CHAR(11) literal Hello World has been promoted to a CHAR(20) and blank padded when compared to the CHAR column. This must have happened since Hello World is not the same as Hello World without the trailing spaces. We can confirm that these two strings are materially different: ops$tkyte@ORA11GR2> select * from t where char_column = varchar2_column; no rows selected They are not equal to each other. We would have to either blank pad out the VARCHAR2_COLUMN to be 20 bytes in length or trim the trailing blanks from the CHAR_COLUMN, as follows: ops$tkyte@ORA11GR2> select * from t where trim(char_column) = varchar2_column; CHAR_COLUMN VARCHAR2_COLUMN -------------------- -------------------Hello World Hello World ops$tkyte@ORA11GR2> select * from t where char_column = rpad( varchar2_column, 20 ); CHAR_COLUMN VARCHAR2_COLUMN -------------------- -------------------Hello World Hello World

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