When I run the following command

sqlplus user/mysecretpass@(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(Host=

I am able to establish connection and result is as follows

enter image description here

I am also able to connect to same database using SQL Developer but when I try to create database connection from ArcMap 10.6.1 I get the following error

enter image description here

I have also followed the instructions here, but I am unable to solve this issue. Can anyone let me know how to solve this problem?

  • There are a number of potential causes, but the most likely is not having the required environment variables. If you use the ArcPy equivalent function you might get a more explicit error. Either way, we need more than you've provided to help. – Vince May 16 at 10:34
  • In the ArcGIS connection string, you say gisdb is a service name. In your command line sqlplus, gisdb is a sid. The best connection method is to always use service names. What happens when you do sqlplus user/mysecretpass@ then sqlplus user/mysecretpass@ ? Do both work ? – Albert Godfrind May 16 at 13:30
  • Forgot this to clarify: a / in the connection string means that whatever follows is a service name. a:means that what follows is a "sid" or "system ID". A "sid" identifies a physical database "instance" (= the processes that access a database). A clustered database can have multiple such instances, on multiple servers: each has its own SID. On the other hand, all instances can share the same service. This is how applications can automatically failover to a different server. – Albert Godfrind May 16 at 14:47
  • Using a service name is the proper way to connect to a database. It is the only way when you connect to a multi-tenant environment (and this is the default now for all Oracle databases, including XE). It is also the only way to connect to a cloud-served database. – Albert Godfrind May 16 at 14:48
  • Hi Godfrind, when I try to run user/mysecretpass@ it gives me TNS:Listener does not know of service requested in connect descriptor and when I try sqlplus user/mysecretpass@ I get connect failed because target host or object does not exist. – Asad Abbas May 17 at 4:59

I was able to solve this problem by adding the following entry in tnsnames.ora


and then using the specified tnsname "test" as instance while connecting to oracle from ArcMap.

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