When I create language plperl , I get error: ERROR: could not load library "C:/Program Files/PostgreSQL/9.1/lib/plperl.dll": The specified module could not be found.

But in my computer, "plperl.dll" file is exist in "C:/Program Files/PostgreSQL/9.1/lib/..." folder ( I can not post illustrative image, this forum require >= 10 reputations)

And if I select * pg_pltemplate, I get:

-[ RECORD 4 ]-+-------------------------
tmplname      | plperl
tmpltrusted   | t
tmpldbacreate | t
tmplhandler   | plperl_call_handler
tmplinline    | plperl_inline_handler
tmplvalidator | plperl_validator
tmpllibrary   | $libdir/plperl
  • If the file exists, the next question is: does the OS user running postgres have permission to load it? You might make this easier by disclosing your OS. Windows something I suppose? Commented Aug 9, 2013 at 14:04
  • Thanks Erwin Brandsetter. I've grant permission for user "postgres" (right click in folder -> properties->Edit->Add) and it can not fix . Library folder ("C:\Program Files\PostgreSQL\9.1\lib") have "plpgsql.dll", plperl.dll . But I can create or replace language "plpgsql" (of course, it load "plpgsql.dll" from this library). So , I think "permission" is not a problem.
    – Luan Huynh
    Commented Aug 10, 2013 at 3:07

1 Answer 1


Because I missed 3 files dll (MSVCR90.DLL, PERL514.DLL, IESHIMS.DLL) in Windows I could not install the language pl/Perl.

Here my steps to solve:

  • Using "Dependency Walker" tool to check dll files missing (if any). After installing, you open plperl.dll file and find errors.
  • Install dll files missing.
  • Install ActivePerl (to install Perl on window, It will automatically set Perl bin folder to windows environment variable)
  • Restart postgresql service
  • Test:

        createlang -U postgres plperl postgre  (it's ok)
        CREATE or replace LANGUAGE plperl      (it's ok)

Download (I just can post 2 links)

Reference: http://www.mkyong.com/database/install-perl-in-postgresql-the-specified-module-could-not-be-found/

  • I think you can use Strawberry Perl too, right? Commented Oct 19, 2017 at 16:52
  • Ah, I remember that I didn't use it.
    – Luan Huynh
    Commented Oct 20, 2017 at 2:26

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