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Oracle Database forgotten password. Proven, viable solution as follows:
1, Ctrl + R cmd open window, enter sqlplus / as sysdba (note / spaces left and right sides)
2, ALTER User username (system) identified by the new password (M1234); change password (NOTE: Be sure to enter the English enter the letters in the state, otherwise it does not recognize
user password recovery is successful, the new settings with a password to login.