How to create user using SQL Developer in Oracle database ? || Oracle SQL Developer Tutorial

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About this Video:
In this video, We will learn How to create user using SQL Developer in Oracle database ?

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[vaibhav.v]

I created three 3 listners due to some problem by changing port number after changing the port still i got this message when I click to the test
Failulare:-test Failed Listners refused the connections with following error :ORA-12505, TNS:Listners does not
How can I overcome this problem please give any suggestion.

[fatenbayou]

Hello, i keep having the same error

Error starting at line 1 in command

CREATE USER OUG IDENTIFIED BY "123"

Error report -

ORA-65096: invalid common user or role name

65096. "invalid common user or role name"

*Cause:

An attempt was made to create a common user or role with a name that was not valid for common users or roles. In addition to the usual rules for user and role names, common user and role names must consist only of ASCII characters, and must contain the prefix specified in common_user_prefix parameter.

*Action:

Specify a valid common user or role name.