oracle - Sqlplus default login and password? -

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i installed sqlplus via ubuntu documentation. default login , password credentials? following documentation, tried sqlplus username/password@//dbhost:1521/sid have investigated similar questions below, none of solutions have been successful me.

https://askubuntu.com/questions/159939/how-to-install-sqlplus#

oracle tns: net service name incorrecly specified

how come sqlplus not connecting?

i have tried testuser/password credentials

sqlplus64 username/password@//dbhost:1521/sid  sql*plus: release 12.1.0.2.0 production on wed oct 14 23:08:13 2015  copyright (c) 1982, 2014, oracle.  rights reserved.  error: ora-12154: tns:could not resolve connect identifier specified   enter user-name: testuser enter password:  error: ora-12162: tns:net service name incorrectly specified   enter user-name:

how login, i'm sorry comments don't make sense me, please write out example, should 1sqlpus 64 username/password@//dbhost:1521/` ?


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