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1901386 - ORA-12154: TNS:could not resolve the connect identifier specified", when trying to connect to Oracle through DCO


  • Error message is raised when trying to connect to ECDA DCO (Direct Connect to Oracle)

  % isql -SDCO_Oracle_SRV –U< user> -P< pword>
  Msg 12154, Level 16, State 0: Server 'DCO_Oracle_SRV':
  ORA-12154: TNS:could not resolve the connect identifier specified
  CT-LIBRARY error: ct_connect(): protocol specific layer: external error: The attempt to connect to the server failed.

  • The Oracle SID changed, and therefore corresponding modifications were made in the Oracle tnsnames.ora file and the Sybase DirectConnect for Oracle configuration file.



  • SAP Adaptive Server Enterprise (ASE) 15.5 on HP Itanium
  • Direct Connect to Oracle (DCO) 15.0.1 on HP Itanium
  • Oracle 11x on HO Itanim

This is a generic issue and could happen on most versions and platforms.



Sybase Adaptive Server Enterprise 15.5 ; Sybase EnterpriseConnect Data Access 15.7


ECDA  Enterprise Connect Data Access, DCO  Direct Connect to Oracle, proxy_table , KBA , BC-SYB-ECD , Enterprise Connect (ECDA) , BC-DB-ORA , Oracle , Problem

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