Updating sas datafiles
SQL*Loader loads data from external datafiles into tables of an Oracle database.A particular datafile can be in fixed record format, variable record format, or stream record format (the default).Direct Path A direct path load does not compete with other users for database resources.It eliminates much of the Oracle database overhead by formatting Oracle data blocks and writing them directly to the database files, bypassing much of the data processing that normally takes place.This method can sometimes be slower than other methods because extra overhead is added as SQL statements are generated, passed to Oracle, and executed.
Data Pump Export and Import enable you to move a subset of the data and metadata.
External Tables An external table load creates an external table for data that is contained in a datafile. The Data Pump Import utility imports an export dump file set into a target Oracle database.
A dump file set is made up of one or more disk files that contain table data, database object metadata, and control information.
The files are written in a proprietary, binary format, which means that the dump file set can be imported only by the Data Pump Import utility.
The dump file set can be imported to the same database or it can be moved to another system and loaded into the Oracle database there.