Oracle database 12.2.0 login

Question

I cannot login into oracle database.

After installing Database 12.2.0 (named as TX) in command line I am typing: sqlplus system/manager@tx And it gives me an invalid user error. I cannot login as a dba or sys and nothing else. My service is running, after "tnsping tx" it looks ok. After lsnrctl status it shows me that my instance TX is READY

Now, again, when I trying to login into tx database using system/manager it says it is wrong username/password. I didn't change anything during installation.

How can I solve this?

Answer 1

Are you sure that SYSTEM user's password is "manager"?

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At operating system's command prompt, logged in as user who "owns" Oracle software (usually the user who installed Oracle database), run

sqlplus / as sysdba

Slash says that you're a trusted user and will let you in. Once you're connected, you can change password for any user in that database as

alter user system identified by your_new_password;