Original Post
Hi,
I am actually a beginner to databases, have Oracle9i installed and currently having problems logging into the SQL PLUS because I believed I do not have the default ID and password.
I learnt from a book titled SQL foundamentals that the defaults are "system" and "manager" but it failed.
Below is the error msg I''ve got.
ERROR:
ORA-12560: TNS protocol adaptor error
I look forward for your kind advice. Thanks in advance.