Re: Unable to create oracle_fdw (foreign data wrapper) extension

Thanks, Scott.

oracle_fdw version 1.5.0 from http://pgxn.org/dist/oracle_fdw/

Oracle client version: instantclient 12.1

/usr/lib/postgresql/9.4/lib# ldd oracle_fdw.so 

linux-vdso.so.1 =>  (0x00007fff50744000)

libclntsh.so.12.1 => /usr/lib/oracle/12.1/client64/lib/libclntsh.so.12.1 (0x00007f44769f1000)

libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f4476666000)

libnnz12.so => /usr/lib/oracle/12.1/client64/lib/libnnz12.so (0x00007f4475f4f000)

libons.so => /usr/lib/oracle/12.1/client64/lib/libons.so (0x00007f4475d0b000)

libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f4475b07000)

libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f4475884000)

libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f4475668000)

libnsl.so.1 => /lib/x86_64-linux-gnu/libnsl.so.1 (0x00007f4475450000)

librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f4475247000)

libaio.so.1 => /lib/x86_64-linux-gnu/libaio.so.1 (0x00007f4475045000)

libclntshcore.so.12.1 => /usr/lib/oracle/12.1/client64/lib/libclntshcore.so.12.1 (0x00007f4474af5000)

/lib64/ld-linux-x86-64.so.2 (0x00007f447990c000)

On Thu, Sep 15, 2016 at 1:10 PM, Scott Mead <scottm@openscg.com> wrote:

On Thu, Sep 15, 2016 at 3:25 PM, Arun Rangarajan <arunrangarajan@gmail.com> wrote:

I am following the instructions here:

http://blog.dbi-services.com/connecting-your-postgresql-instance-to-an-oracle-database/

to install Oracle foreign data wrapper, oracle_fdw, on a PostgreSQL server.

---

Oracle version: Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production, running on Red Hat Linux 7.2

PostgreSQL version: PostgreSQL 9.4.4 on x86_64-unknown-linux-gnu, compiled by gcc (Debian 4.7.2-5) 4.7.2, 64-bit, running on Debian 7 (wheezy).

---

I was able to install sqlplus and connect from PostgreSQL server to Oracle server using sqlplus successfully, so connectivity is not a problem.

But when I try to create the extension, I get the following error:

 

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postgres=# create extension oracle_fdw;

server closed the connection unexpectedly

This probably means the server terminated abnormally

before or while processing the request.

The connection to the server was lost. Attempting reset: Failed.

Hmm, odd that it's causing a crash.

  Which version of the oracle_fdw and which version of the oracle libraries are you linked to?  Make sure to check 'ldd oracle_fdw.so'

--Scott

 

---

Then I took clues from https://github.com/dalibo/pg_qualstats/issues/1 and added oracle_fdw to shared_preload_libraries in postgresql.conf like this:

shared_preload_libraries = 'oracle_fdw'

but now I can't restart Postgres:

---

# service postgresql restart

[....] Restarting PostgreSQL 9.4 database server: main[....] The PostgreSQL server failed to start. Please check the log output: t=2016-09-15 11:05:42 PDT d= h= p=23300 a=FATAL: XX000: invalid cache ID[FAILt=2016-09-15 11:05:42 PDT d= h= p=23300 a=LOCATION: SearchSysCacheList, syscache.c:1219 ... failed!

 failed!

---

Looking into /var/log/postgresql/postgresql-9.4-main.log I only see these two lines: 

t=2016-09-15 11:05:42 PDT d= h= p=23300 a=FATAL:  XX000: invalid cache ID: 41

t=2016-09-15 11:05:42 PDT d= h= p=23300 a=LOCATION:  SearchSysCacheList, syscache.c:1219

Removing oracle_fdw from shared_preload_libraries allows postgres to be restarted, so this is the one causing restart to fail.

How to fix this and get the foreign data wrapper working?

Thank you.

​

--

--
Scott Mead
Sr. Architect
OpenSCG

http://openscg.com