In previous posts I have explored various reasons why a client process might not be able to connect to an Oracle database. In “Help! I can’t connect to my database” I presented an overview of the process used by sqlnet to convert a connection request to a network connection descriptor and deliver that request to a listener capable of servicing the request. I followed that with two posts going into more depth on the types of problems that can prevent the request from reaching the host server. Now I would like to look at the next possible problem in the sequence, in particular “ORA-12514: TNS:listener does not currently know of service requested in connect descriptor”.
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