Oracle libraries are loaded when perl is already running1, while loading DBD::Oracle. So you can modify %ENV inside Perl, as long as you do so before loading DBD::Oracle. Typically, you would use a BEGIN block in the main script, before the use DBI / use DBD::Oracle lines.
Alexander
1) Exception to the rule: ancient oraperls, that link perl and Oracle code into a single executable
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Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)
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