I am using Oracle
C:\Users\Administrator>exp
Export: Release 11.2.0.1.0 - Production on Thu Sep 7 15:15:18 2017
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
Username: erp
Password:
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit
Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Enter array fetch buffer size: 4096 >
Export file: EXPDAT.DMP > D:\erp_backup.dmp
(1)E(ntire database), (2)U(sers), or (3)T(ables): (2)U >
Export grants (yes/no): yes >
Export table data (yes/no): yes >
Compress extents (yes/no): yes >
Export done in WE8MSWIN1252 character set and AL16UTF16 NCHAR character set
EXP-00002: error in writing to export file
EXP-00000: Export terminated unsuccessfully
C:\Users\Administrator>
C:\Users\Administrator>exp erpl\1234 file=d:\erp_backup.dmp log=d:\erp_backup.log
Export: Release 11.2.0.1.0 - Production on Thu Sep 7 15:18:21 2017
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
Password:
EXP-00056: ORACLE error 1017 encountered
ORA-01017: invalid username/password; logon denied
Username: erp
Password:
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Export done in WE8MSWIN1252 character set and AL16UTF16 NCHAR character set
EXP-00002: error in writing to export file
EXP-00000: Export terminated unsuccessfully
C:\Users\Administrator>