If you are not specifying the dump directory and file name, the dump file will be stored in the default dump directory with the default file name. The tutorial exercise below tells you find what is your default dump directory and locate the dump file.

>sqlplus /nolog

SQL> connect SYSTEM/globalguideline

SQL> COL owner FORMAT A8;

SQL> COL directory_name FORMAT A16;

SQL> COL directory_path FORMAT A40;

SQL> SELECT * FROM dba_directories;

OWNER DIRECTORY_NAME DIRECTORY_PATH

----- -------------- -------------------------------------

SYS DATA_PUMP_DIR oraclexeapporacleadminXEdpdump

SYS TEST_DIR  /oraclexe/test

SYS ORACLECLRDIR oraclexeapporacleproduct10.2.0

    serverinclr

Obviously, the default dump directory is directory object defined to oraclexeapporacleadminXEdpdump. If you go to that directory, you will find the full database dump file is called "expdat.dmp".