Make sure you set the environment variable ORACLE_HOME first of all. I also set the TWO_TASK environment variable so I don't have to put the SID in the script. 
$ENV{ORACLE_HOME}=/path/to/oracle
$ENV{TWO_TASK}=T:IP_ADDRESS:SID

$database = DBI->connect ('dbi:Oracle', $user, $pass, {});

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In reply to Re: Specifying Variable SID in DBD::Oracle by ajwans
in thread Specifying Variable SID in DBD::Oracle by rebelpacket

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