Do I need my databases' client software to be installed to connect r9.x CA ERwin DM to the r9.x Mart? Matt Russo Updated November 05, 2019 14:25 Follow Solution: no database client software is needed for r9 CA ERwin DM to connect to the r9 mart. r9 ERwin establishes the connection to the mart using JDBC (Java Database Connectivity). Related articles Error 1918. Error installing ODBC driver erwin r8.2 DataDirect OpenAccess, ODBC error 13: The setup routines for the erwin r8.2 DataDirect OpenAccess ODBC driver could not be loaded due to system error code 126 When attempting to get to the erwin Mart Administrator page, I get the following Application Internal Error: ORA-12514 TNS:listener does not currently know of service requested in connect descriptor. How may I troubleshoot the way my r9 mart connects to Oracle DBMS? How to set up an ODBC Data Source and Reverse Engineer a database using it ? What is erwin EC? Comments 0 comments Please sign in to leave a comment.