Best technical definition ever
“ORA-12505: TNS: listener does not currently know of SID given in connect descriptor”
What does that error mean? The site below defines the error eloquently:

Categories: Engineering
“ORA-12505: TNS: listener does not currently know of SID given in connect descriptor”
What does that error mean? The site below defines the error eloquently:

It means that Oracle lets their *developers* write all the error strings….