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So here, the search for the VARCHAR2 string worked, but the CHAR column did not The VARCHAR2 bind variable will not be promoted to a CHAR(20) in the same way as a character string literal At this point, many programmers form the opinion that bind variables don t work; we have to use literals That would be a very bad decision indeed The solution is to bind using a CHAR type: ops$tkyte@ORA11GR2> variable char_bv char(20) ops$tkyte@ORA11GR2> exec :char_bv := 'Hello World'; PL/SQL procedure successfully completed ops$tkyte@ORA11GR2> ops$tkyte@ORA11GR2> select * from t where char_column = :char_bv; CHAR_COLUMN VARCHAR2_COLUMN -------------------- -------------------Hello World Hello World ops$tkyte@ORA11GR2> select * from t where varchar2_column = :char_bv; no rows selected However, if you mix and match VARCHAR2 and CHAR, you ll be running into this issue constantly Not only that, but the developer is now having to consider the field width in her applications.

The field list shows the field names, position, data type, delimiters, and any applicable conditions. You can specify numerous variables in the control file, and you can informally sort them into the following groups: Loading-related clauses Datafile-related clauses Table- and field-mapping clauses Command-line parameters in the control file The following sections describe the parameters you can specify in the control file to configure your data loads.

NUMERIC(p,s): Maps exactly to a NUMBER(p,s). If p is not specified, it defaults to 38. DECIMAL(p,s) or DEC(p,s): Maps exactly to a NUMBER(p,s). If p is not specified, it defaults to 38. INTEGER or INT: Maps exactly to the NUMBER(38) type. SMALLINT: Maps exactly to the NUMBER(38) type. FLOAT(b): Maps to the NUMBER type. DOUBLE PRECISION: Maps to the NUMBER type. REAL: Maps to the NUMBER type.

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If you aren t sure which parameters you can use for your SQL*Loader run, just type sqlldr at the operating system prompt to view all the available options. You will see a complete list of all the parameters and their operating system-specific default values (if any exist).

If the developer opts for the RPAD() trick to convert the bind variable into something that will be comparable to the CHAR field (it is preferable, of course, to pad out the bind variable, rather than TRIM the database column, as applying the function TRIM to the column could easily make it impossible to use existing indexes on that column), she would have to be concerned with column length changes over time If the size of the field changes, then the application is impacted, as it must change its field width It is for these reasons the fixed-width storage, which tends to make the tables and related indexes much larger than normal, coupled with the bind variable issue that I avoid the CHAR type in all circumstances.

The keywords LOAD DATA start off a control file. This simply means that the data is to be loaded from the input datafile to the Oracle tables using the SQL*Loader utility. The INTO TABLE clause indicates into which table the data will be loaded. If you re loading into multiple tables simultaneously, you ll need an INTO TABLE statement for each table. The keywords INSERT, REPLACE, and APPEND instruct the database how the load will be done. If it is an INSERT, the table is assumed to be empty; otherwise, the loading process will generate an error and stop. The REPLACE clause will truncate the table and start loading new data. You ll often see that a load job using the REPLACE option seems to hang initially. This is because Oracle is busy truncating the table before it starts the load process. The APPEND clause will add the new rows to existing table data.

In general, the Oracle NUMBER type is the best overall choice for most applications. However, there are performance implications associated with that type. The Oracle NUMBER type is a software datatype it is implemented in the Oracle software itself. We cannot use native hardware operations to add two NUMBER types together, as it is emulated in the software. The floating-point types, however, do not have this implementation. When we add two floatingpoint numbers together, Oracle will use the hardware to perform the operation.

I cannot even make an argument for it in the case of the one-character field, because in that case it is really of no material difference The VARCHAR2(1) and CHAR(1) are identical in all aspects There is no compelling reason to use the CHAR type in that case, and to avoid any confusion, I just say no, even for the CHAR(1) field..

You can use several clauses to specify the locations and other characteristics of the datafile(s) from which you re going to load data using SQL*Loader. The following sections cover the important datafile-related clauses.

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