Using EZCONNECT via DBCO or remote/secondary Oracle connection, you don't need to maintain tnsnames.ora in SAP application server side.
Oracle as remote or secondary database
ezconnect, dbco, tnsnames.ora, dbacockpit , KBA , BC-DB-ORA-SYS , Database Interface / DBMS , BC-DB-ORA-CCM , (CCMS) Database Monitors , BC-DB-ORA-DBA , Database Administration , How To
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