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It is possible to use Oracle database tables in the R statistical software. And this is a very useful approach (if you know R's capabilities). The fact that you are on this blog now may means that you had no success trying to use tables in R and that you received ORA-12541 once more. To solve this problem, you can omit the next paragraph. However, for getting started with Oracle 12c and R you should take a look at the documentation provided by Oracle. Clear and brief it says that you have to do the following things to use Oracle database in R: Install the Oracle Instant Client if you don't have already from http://www.oracle.com/technetwork/database/features/instant-client/ Install Oracle's R distribution (ORD) from https://oss.oracle.com/OR Modify the PATH variable for the  path of Instant Client Set the environment variable OCI_LIB64 with the path to the Instant Client Install ORE Client Package for R from http://www.oracle.com/technetwork/database/options/advanced-...

Lazarus Programmers have had no possibility to use TOracleConnection under 64 Bit Windows and Lazarus for years. Even if you tried to use the TOracleConnection with a correctly configured Oracle 11g client, you were not able to connect to the Oracle Database. The error message was always: ORA-12154: TNS:could not resolve the connect identifier specified Today I found a simple workaround to fix this problem. It seems like the OCI.DLL from Oracle Client 11g2 is buggy. All my attempts to find identify the error ended here. I could exclude problems with the TNS systems in Oracle - or the Free Pascal file oracleconnection.pp though the error messages suggestes those problems. After investigating the function calls with Process Monitor (Procmon) I found out, that even the file TNSNAMES.ORA was found and read correctly by the Lazarus Test applictaion. So trouble with files not found or wrong Registry keys could also be eliminated. Finally I installed the Oracle Instant Client 12.1c - aft...