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full range of functions to be applied to the table columns during the load. The direct-path loading method supports a far more limited number of transformations during the load. Oracle recommends that you use the conventional loading method for small data loads and the direct-path loading method for larger loads. You ll learn the specifics of direct-path loading after examining the main SQL*Loader features and using the conventional loading method. External data loading is covered in the Using External Tables to Load Data section later in this chapter. Loading data using the SQL*Loader utility involves two main steps: 1. Select the datafile that contains the data you want to load. The datafile usually ends with the extension .dat and contains the data you want to load. The data could be in several formats. 2. Create a control file. The control file tells SQL*Loader how to map the data fields to an Oracle table and specifies whether the data needs to be transformed in some way. The control file usually ends with the extension .ctl. The control file will provide the mapping of the table columns to the data fields in the input file. There is no requirement that you have a separate datafile for the load. If you wish, you can include the data in the control file itself, after you specify the load control information such as the field specification and so on. The data can be supplied in fixed-length fields or in free format, separated by a character such as a comma (,) or a pipe (|). Let s begin by studying the all-important SQL*Loader control file.

The EXCLUDE and INCLUDE parameters are mutually exclusive. You can use one or the other, not both simultaneously in the same job.

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The SQL*Loader control file is a simple text file in which you specify important details about the data load job, such as the location of the source datafile. The control file is also the place where you map the datafiles to the table columns. You can also specify any transformation during the load process within the control file. The control file contains the names of the log files for the load and files for catching bad and rejected data. The control file instructs SQL*Loader regarding the following aspects of the SQL*Loader session: The source of the data to be loaded into the database The column specification of the target table The nature of the input file formatting The mapping of the input file fields to the table columns Data transformation rules (applying SQL functions) The locations for the log files and error files Listing 13-1 shows a typical SQL*Loader control file. SQL*Loader considers data rows in the source datafiles to be records, and you can specify the record formats in the control file. Note that you can also use a separate file for the data. In this example, you see the control information followed by in-line data, as shown by the use of the INFILE * specification in the control file. This specification indicates that the data for the load will follow the control information for the load. If you are doing a onetime data load, it is probably better to keep things simple and place the data in the control file itself. The keyword BEGINDATA tells SQL*Loader where the data portion of the control file starts. Listing 13-1. A Typical SQL*Loader Control File LOAD DATA INFILE * BADFILE test.bad DISCARDFILE test.dsc

When you filter metadata by using the EXCLUDE or INCLUDE parameters, remember that all objects that depend on any of the filtered objects are processed in the same fashion as the filtered object. For example, when you use the EXCLUDE parameter to exclude a table, you ll also be automatically excluding the indexes, constraints, triggers, and so on that are dependent on the table.

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