This client tool was installed by someone else.So it's a separate product, in a different Oracle Home.
ORA-12154: TNS:cound not resolve the connect identifier specified
Looks like you don't have tnsnames.ora within that Oracle Home. If so, you can copy there a working one, or you can set TNS_ADMIN environment variable to point to a working one.
$ oerr ora 12154 12154, 00000, "TNS:could not resolve the connect identifier specified" // *Cause: A connection to a database or other service was requested using // a connect identifier, and the connect identifier specified could not // be resolved into a connect descriptor using one of the naming methods // configured. For example, if the type of connect identifier used was a // net service name then the net service name could not be found in a // naming method repository, or the repository could not be // located or reached. // *Action: // - If you are using local naming (TNSNAMES.ORA file): // - Make sure that "TNSNAMES" is listed as one of the values of the // NAMES.DIRECTORY_PATH parameter in the Oracle Net profile // (SQLNET.ORA) // - Verify that a TNSNAMES.ORA file exists and is in the proper // directory and is accessible. // - Check that the net service name used as the connect identifier // exists in the TNSNAMES.ORA file. // - Make sure there are no syntax errors anywhere in the TNSNAMES.ORA // file. Look for unmatched parentheses or stray characters. Errors // in a TNSNAMES.ORA file may make it unusable. // - If you are using directory naming: // - Verify that "LDAP" is listed as one of the values of the // NAMES.DIRETORY_PATH parameter in the Oracle Net profile // (SQLNET.ORA). // - Verify that the LDAP directory server is up and that it is // accessible. // - Verify that the net service name or database name used as the // connect identifier is configured in the directory. // - Verify that the default context being used is correct by // specifying a fully qualified net service name or a full LDAP DN // as the connect identifier // - If you are using easy connect naming: // - Verify that "EZCONNECT" is listed as one of the values of the // NAMES.DIRETORY_PATH parameter in the Oracle Net profile // (SQLNET.ORA). // - Make sure the host, port and service name specified // are correct. // - Try enclosing the connect identifier in quote marks. // // See the Oracle Net Services Administrators Guide or the Oracle // operating system specific guide for more information on naming. $
1008180 wrote:That Oracle Home has its own network\admin directory and tnsnames.ora (separate from the XE db one). A tnsnames.ora file may not have been created (yet) in that home, depending on how the stuff was installed/configured.
I tried to run SQL Plus under Oracle - OracleHome 10G
User Name: system
Host String: xe
ORA-12154: TNS:cound not resolve the connect identifier specifiedAs noted above, use Easy connect i.e "tnsnames-less" naming method, or you'll need to configure the 10g home with an tnsnames entry and connect identifer "xe".
I have no problem connecting to Oracle XE using Run SQL Command Line or SQL Developer.Different "homes", different config.
Here is the content of tnsnames.oraSearch windows drives for tnsnames.ora files - there may be one, two or more.