in reply to connect to Oracle with DBI

Have you consulted with your database administrator whether the sid=orcl is the correct SID to use?

Most likely, you want to inspect your TNSNAMES.ORA to find out whether that SID is listed there.

Have you looked at the ::Troubleshooting files in DBD::Oracle for your operating system(s)?

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Re^2: connect to Oracle with DBI
by fionbarr (Friar) on Aug 29, 2014 at 19:35 UTC
    do I have to install DBD::Oracle (windows 7)
      No, you don't have to install it, it's already installed. But yes, DBD::Oracle must be installed.