Thread

1. Foreign Data Wrapper from Oracle to Postgres 16

   Santhosh S <sansel25041991@gmail.com> — 2025-07-02T18:28:33Z

   Hi team,
   
   I am working on a project along with my peers on developing an Foreign Data
   Wrapper to transfer data from Oracle to Postgres 16. We followed the below
   steps in order:
   
   1. Developed the Foreign Data Wrapper (64-bit) using Microsoft Visual
   Studio to transfer from Oracle to Postgres 16
   2. Installed Oracle Instant Client 64-bit versionand InstantClient Path has
   been set in the environment variables
   3. Have Postgres 16 64-bit version installed
   4. Placed all the files from each folder of the downloaded ORACLE_FDW
   package should be copied into the respective folders of PostgreSQL
   Installation directory
   5. “oci.dll” from the Oracle Instant Client Installation directory to
   PostgreSQL Installation directory
   6. Visual C++ redistributable is installed
   
   After the above steps when we try to execute the below statement in
   Postgres 16
   
   CREATE EXTENSION IF NOT EXISTS oracle_fdw
   SCHEMA public
   VERSION "1.2"
   
   we get the error "SQL Error [58P01]: ERROR: could not load library
   "C:/Program Files/PostgreSQL/16/lib/oracle_fdw.dll": The specified module
   could not be found.
   Error position"
   
   But we are able to execute the above command successfully in Postgres 13
   and successfully transfer data from Oracle to Postgres 13.
   
   Any help or direction would be greatly helpful.
   
   Regards
   Santhosh S
   

2. Re: Foreign Data Wrapper from Oracle to Postgres 16

   Laurenz Albe <laurenz.albe@cybertec.at> — 2025-07-03T06:50:22Z

   On Wed, 2025-07-02 at 23:58 +0530, Santhosh S wrote:
   > I am working on a project along with my peers on developing an Foreign Data Wrapper
   > to transfer data from Oracle to Postgres 16. We followed the below steps in order:
   > 
   > 1. Developed the Foreign Data Wrapper (64-bit) using Microsoft Visual Studio to transfer from Oracle to Postgres 16
   > 2. Installed Oracle Instant Client 64-bit versionand InstantClient Path has been set in the environment variables
   > 3. Have Postgres 16 64-bit version installed
   > 4. Placed all the files from each folder of the downloaded ORACLE_FDW package should
   >    be copied into the respective folders of PostgreSQL Installation directory
   > 5. “oci.dll” from the Oracle Instant Client Installation directory to PostgreSQL Installation directory
   > 6. Visual C++ redistributable is installed
   > 
   > After the above steps when we try to execute the below statement in Postgres 16
   > 
   > CREATE EXTENSION IF NOT EXISTS oracle_fdw
   > SCHEMA public
   > VERSION "1.2"
   > 
   > we get the error "SQL Error [58P01]: ERROR: could not load library "C:/Program Files/PostgreSQL/16/lib/oracle_fdw.dll": The specified module could not be found.
   > Error position" 
   > 
   > But we are able to execute the above command successfully in Postgres 13 and successfully transfer data from Oracle to Postgres 13.
   > 
   > Any help or direction would be greatly helpful.
   
   This is better tracked here: https://github.com/laurenz/oracle_fdw/issues/754
   
   By the way, I took a double take when I read your report.
   For me "developing" a FDW means writing the code, whereas you are clearly
   talking about what I would call "building", "compiling" or "instaling"
   the FDW.  No problem, I just want to avoid confusion.
   
   Yours,
   Laurenz Albe
   
   
   
   

3. Re: Foreign Data Wrapper from Oracle to Postgres 16

   DINESH NAIR <dinesh_nair@iitmpravartak.net> — 2025-07-04T13:44:03Z

   Hi,
   
   We found a link that may help resolve the issue you encountered while creating the oracle_fdw extension on windows machine.
   
   laurenz/oracle_fdw: PostgreSQL Foreign Data Wrapper for Oracle<https://github.com/laurenz/oracle_fdw?tab=readme-ov-file#6-installation>
   [https://opengraph.githubassets.com/5ddf3cfa010c4132953bb148ce5b719f099b54771a4898555db8946528da016a/laurenz/oracle_fdw]<https://github.com/laurenz/oracle_fdw?tab=readme-ov-file#6-installation>
   GitHub - laurenz/oracle_fdw: PostgreSQL Foreign Data Wrapper for Oracle<https://github.com/laurenz/oracle_fdw?tab=readme-ov-file#6-installation>
   PostgreSQL Foreign Data Wrapper for Oracle. Contribute to laurenz/oracle_fdw development by creating an account on GitHub.
   github.com
   
   
   
   
   Thanks
   
   Dinesh Nair
   
   
   ________________________________
   From: Laurenz Albe <laurenz.albe@cybertec.at>
   Sent: Thursday, July 3, 2025 12:20 PM
   To: Santhosh S <sansel25041991@gmail.com>; pgsql-general@postgresql.org <pgsql-general@postgresql.org>; pgsql-novice@postgresql.org <pgsql-novice@postgresql.org>
   Subject: Re: Foreign Data Wrapper from Oracle to Postgres 16
   
   Caution: This email was sent from an external source. Please verify the sender’s identity before clicking links or opening attachments.
   
   On Wed, 2025-07-02 at 23:58 +0530, Santhosh S wrote:
   > I am working on a project along with my peers on developing an Foreign Data Wrapper
   > to transfer data from Oracle to Postgres 16. We followed the below steps in order:
   >
   > 1. Developed the Foreign Data Wrapper (64-bit) using Microsoft Visual Studio to transfer from Oracle to Postgres 16
   > 2. Installed Oracle Instant Client 64-bit versionand InstantClient Path has been set in the environment variables
   > 3. Have Postgres 16 64-bit version installed
   > 4. Placed all the files from each folder of the downloaded ORACLE_FDW package should
   >    be copied into the respective folders of PostgreSQL Installation directory
   > 5. “oci.dll” from the Oracle Instant Client Installation directory to PostgreSQL Installation directory
   > 6. Visual C++ redistributable is installed
   >
   > After the above steps when we try to execute the below statement in Postgres 16
   >
   > CREATE EXTENSION IF NOT EXISTS oracle_fdw
   > SCHEMA public
   > VERSION "1.2"
   >
   > we get the error "SQL Error [58P01]: ERROR: could not load library "C:/Program Files/PostgreSQL/16/lib/oracle_fdw.dll": The specified module could not be found.
   > Error position"
   >
   > But we are able to execute the above command successfully in Postgres 13 and successfully transfer data from Oracle to Postgres 13.
   >
   > Any help or direction would be greatly helpful.
   
   This is better tracked here: https://ind01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Flaurenz%2Foracle_fdw%2Fissues%2F754&data=05%7C02%7Cdinesh_nair%40iitmpravartak.net%7C0b83211e99d44b76a1ce08ddba4ddf83%7C3e964837c2384683915549f4ec04f8e9%7C0%7C0%7C638871565825604004%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=hwVQ5nQaRomTkOBz49RpAW4k8YA1gbmANAXRRZrFCe8%3D&reserved=0<https://github.com/laurenz/oracle_fdw/issues/754>
   
   By the way, I took a double take when I read your report.
   For me "developing" a FDW means writing the code, whereas you are clearly
   talking about what I would call "building", "compiling" or "instaling"
   the FDW.  No problem, I just want to avoid confusion.
   
   Yours,
   Laurenz Albe