Default: NO
Purpose
Specifies whether to overwrite a preexisting dump file.
Syntax and Description
REUSE_DUMPFILES=[YES | NO]
Normally, Data Pump Export will return an error if you specify a dump file name that already exists. The REUSE_DUMPFILES parameter allows you to override that behavior and reuse a dump file name. For example, if you performed an export and specified DUMPFILE=hr.dmp and REUSE_DUMPFILES=YES, then hr.dmp would be overwritten if it already existed. Its previous contents would be lost and it would contain data for the current export instead.
Example
The following export operation creates a dump file named enc1.dmp, even if a dump file with that name already exists.
> expdp hr DIRECTORY=dpump_dir1 DUMPFILE=enc1.dmp TABLES=employees REUSE_DUMPFILES=YES