Re: Foreign Data Wrapper from Oracle to Postgres 16

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
toPostgres 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