SQL error 28001 when accessing table "PAKDATBUF".

What happened?
    Error Text of the Database: "ORA-28001: the password has expired"

What can you do?
    Note which actions and input led to the error.
    For further help in handling the problem, contact your SAP administrator
    .
    You can use the ABAP dump analysis transaction ST22 to view and manage
    termination messages, in particular for long term reference.
    Note which actions and input led to the error.
    For further help in handling the problem, contact your SAP administrator
    .
    You can use the ABAP dump analysis transaction ST22 to view and manage
    termination messages, in particular for long term reference.

Solution:

Check  the database user status. Might expired.