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Asked: 2026-05-10T15:08:20+00:00

Sometimes I get Oracle connection problems because I can’t figure out which tnsnames.ora file

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Sometimes I get Oracle connection problems because I can’t figure out which tnsnames.ora file my database client is using.

What’s the best way to figure this out? ++happy for various platform solutions.

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  1. Oracle provides a utility called tnsping:

    R:\>tnsping someconnection  TNS Ping Utility for 32-bit Windows: Version 9.0.1.3.1 - Production on 27-AUG-20 08 10:38:07  Copyright (c) 1997 Oracle Corporation.  All rights reserved.  Used parameter files: C:\Oracle92\network\ADMIN\sqlnet.ora C:\Oracle92\network\ADMIN\tnsnames.ora  TNS-03505: Failed to resolve name  R:\>   R:\>tnsping entpr01  TNS Ping Utility for 32-bit Windows: Version 9.0.1.3.1 - Production on 27-AUG-20 08 10:39:22  Copyright (c) 1997 Oracle Corporation.  All rights reserved.  Used parameter files: C:\Oracle92\network\ADMIN\sqlnet.ora C:\Oracle92\network\ADMIN\tnsnames.ora  Used TNSNAMES adapter to resolve the alias Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (COMMUNITY = **)  (PROTOCOL = TCP) (Host = ****) (Port = 1521))) (CONNECT_DATA = (SID = ENTPR0 1))) OK (40 msec)  R:\>

    This should show what file you’re using. The utility sits in the Oracle bin directory.

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