Hi rajesh_perl
Please look into below node too in super search (OT) DBD error Ora-12154 which describes well about the solution.

In reply to Re: ORA-12154: TNS:could not resolve the connect identifier specified (DBD ERROR: OCIServerAttach) by madtoperl
in thread ORA-12154: TNS:could not resolve the connect identifier specified (DBD ERROR: OCIServerAttach) by rajesh_perl

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