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The direct-path loading method inserts data directly into the datafiles by formatting the data blocks. By bypassing the INSERT statement mechanism, the table constraints and triggers aren t systematically applied during a direct load. All triggers are disabled, as are several integrity constraints. SQL*Loader

automatically disables all foreign keys and check constraints, but the not null, unique, and primary key constraints are still maintained by SQL*Loader. Upon completion of the SQL*Loader run, the disabled constraints are automatically enabled by SQL*Loader if the REENABLE clause has been specified. Otherwise, the disabled constraints must be manually reenabled. The disabled triggers are automatically enabled after the load is completed.

A parent-child relationship occurs typically when one class (the parent) manages lower-level classes (the children). An example might be a Window class that acts as a parent to child Decorator classes like status bars, menu bars, and toolbars. Figure 1-55 shows the class diagram.

The following tips will help you optimize SQL*Loader during data loads, especially when the data loads are large and/or you have multiple indexes and constraints on the tables in your database Try to use the direct-path loading method as much as possible It s much faster than conventional data loading Use the UNRECOVERABLE=true option wherever possible (in direct loads) This will save you considerable time, because the newly loaded data doesn t need to be logged in the redo log file Media recovery is still in force for all the other users of the database, and you can always start a new SQL*Loader run if there s a problem Keep the use of the NULLIF and DEFAULTIF parameters to a minimum These clauses must be tested for every single row on which they re used Minimize the number of data type and character set conversions, as they slow down processing.

Wherever possible, use positional fields rather than delimited fields SQL*Loader can move from field to field much faster if it s given the position of the field Map physical and logical records on a one-to-one basis Disable constraints before the load, as the constraints will slow down the loading Of course, you may sometimes end up with errors while enabling the constraints, but it s a small price to pay for a much faster data load, especially for large tables If you re using the direct-path loading method, specify the SORTED_INDEXES clause to optimize the load performance If you re doing large data loads, it s smart to drop the indexes on the tables before the load Index maintenance will slow down your SQL*Loader session If it isn t possible to drop the indexes, you can make them unusable and use the SKIP_UNUSABLE_INDEXES clause during the load.

If it s a direct load, use the SKIP_INDEX_ MAINTENANCE clause..

Figure 1-55. An example of a parent-child relationship In parent-child relationships, usually the parent creates instances of the children, so the parent has unambiguous type coupling, and therefore static coupling, to each specific child class. See Figure 1-56.

Using SQL*Loader is efficient, but it s not without its share of headaches. This section describes how to perform some special types of operations during data loads.

You can use WHEN clauses during data loads to limit the load to only those rows that match certain conditions. For example, in a datafile, you can pick up only those records that have a field matching certain criteria. Here s an example that shows how to use the WHEN clause in a SQL*Loader control file: LOAD DATA INFILE * INTO TABLE stagetbl APPEND WHEN (activity_type <>'H') and (activity_type <>'T') FIELDS TERMINATED BY ','

TRAILING NULLCOLS /* Table columns here . . .*/ BEGINDATA /* Data here . . .*/ The WHEN condition will reject all records where the data record field matching the activity_type column in the stagetbl table is neither H nor T.