EXPDP to multiple files

If you know that your export job will span multiple GBs and you want to split it at a known file size you can do so by using a couple of switches.

%U - used in the file name to assign the file #
FILESIZE - allows you to specify the dumpfile size

Example
expdp brian@msdss directory=datapump_dir dumpfile=filename_U%.dmp logfile=filename.log content=ALL filesize=2G tables=table_name