On the UNIX and Linux operating systems, data sources are stored system-specifically in the directory /etc/ in the file odbc.ini or user-specifically in the file ~/.odbc.ini. To create data sources, edit the required file appropriately.
...
1. Open an editor.
2.
Open the required
file.
Specify the name of the data source, the database server, and the database
instance in accordance with the following structure:
You can also specify Options for Data
Sources [Page 29], if you want to change the system default values.
[<data_source_name>]
ServerDB=<database_name>
ServerNode=<name_of_database_server>
SQLMode=<INTERNAL|DB2|ANSI|ORACLE>
IsolationLevel=<Uncommitted|Committed|Repeatable|Serializable>
TraceFileName=<trace_file_path_and_name>
If you want to specify
multiple data sources, repeat the group of specifications above in accordance
with the number of data sources.
3.
Save your entries.
Your entries become effective when the next ODBC connection is
created.