How to use sqlplus to connect to an Oracle Database located on another host without modifying my own tnsnames.ora
I want to connect to an oracle database located on another host using sqlplus. This page suggested adding an item on my tnsnames to conenct to that database
local_SID = (DESCRIPTION = (ADDRESS = (PROTOCOL= TCP)(Host= hostname.network)(Port= 1521)) (CONNECT_DATA = (SID = remote_SID)) )
and then use that in sqlplus
sqlplus user/[email protected]_SID
However, in my circumstances modifying the local tnsnames is not possible. Is it possible to connect to a remote database just by using sqlplus argument without having to change tnsnames? Something like
sqlplus user/[email protected][email protected] ;( I know, this one is not valid)
sqlplus user/[email protected](DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(Host=hostname.network)(Port=1521))(CONNECT_DATA=(SID=remote_SID)))
Maybe, and this might be dependant on the command line environment you're using, you need to quote the string, something like
sqlplus "user/[email protected](DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(Host=hostname.network)(Port=1521))(CONNECT_DATA=(SID=remote_SID)))"
sqlplus 'user/[email protected](DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(Host=hostname.network)(Port=1521))(CONNECT_DATA=(SID=remote_SID)))'
You can use easy connect for this:
sqlplus usr/[email protected]/remote_service_name
To enable easy connect on your machine, you need to add it to the
NAMES.DIRECTORY_PATHin sqlnet.ora, e.g.:
If your listener is on a non-default port use
Actually it seems you have to supply a service name, not a SID; they may be the same but if not you'll need to obtain that from the server.
If the service name is the same as the hostname, you don't even need to specify the service name when connecting. (Practically nobody does this, but it's nice to know.)
Create a copy of the tnsnames.ora file in a directory that you can write to, modify the file accordingly, then set the TNS_ADMIN environment variable to the location of that directory.
cp $ORACLE_HOME/network/admin/tnsnames.ora /tmp/tnsnames.ora # edit the /tmp/tnsnames.ora file to add your entries # Set the $TNS_ADMIN environment variable so that sqlplus knows where to look export TNS_ADMIN=/tmp
On Unix/Linux system you can use the user level configuration files to override system level entries.
System-Level User-Level Configuration File Configuration File ------------------ ------------------- sqlnet.ora $HOME/.sqlnet.ora tnsnames.ora $HOME/.tnsnames.ora
The system-level configuration Files can be found in the directory
$TNS_ADMIN. If the variable
TNS_ADMINis not set then they are searched in the directory
The user-level configuration files don't substitute the system level configuration files as a whole (as the
TNS_ADMINdirectory substitute the whole
$ORACLE_HOME/network/admindirectory) but they add to or change entries of the system-level configuration files. If an entry exists in an user-level configuration file then this one is used, if it does not exist in the user-level configuration file then the entry of the system-level configuration file is used.