Thread: Will This Work?

gene.poole wrote
> When I create a Oracle 11gR2 database we initially use the netca and dbca
> utilities to create the basic database files and network connections.
> Afterwards we run a bash script to create the application database detail
> files.  We use this bash script to define certain files on specific raid-1
> file systems.
> How would we do this using PostgreSQL?

The PostgreSQL documentation is quite good in covering this stuff though a
number of items end up being distro-specific with additional information
available elsewhere.

I'd suggest forgetting about the fact you are migrating an existing
application to PostgreSQL and approach it from a fresh-start perspective and
learn generally how PostgreSQL operates.  Once you have a feel for how
things correlate the migration should go much more smoothly.

EnterpriseDB (with whom I am in no way affiliated) seems to have setup a
focus for itself in supporting Oracle to PostgreSQL migrations.  Other's may
be capable as well but they, IMHO, at least have done the best job marketing
that niche...


> What is the version of PostgreSQL
> you would suggest running on RHEL 5.9 x86_64?

The most recent version usually - 9.3;  9.2 if you dislike .0 releases.
Since you are migrating I'd suggest 9.3 regardless because by the time you
are ready it'll probably be at least a .2 release.


> If I wanted to move from
> Oracle to PostgreSQL is it possible to use a Oracle export DMP file to
> load the PostgreSQL database?

No clue; though doubtful.  Even if technically capable of being used for an
import inherent language differences would likely cause the SQL commands to
fail.  Again, this is a problem that has already been addressed and I would
generally advise paying for someone else's experience rather than trying to
figure it out on your own while asking for no-charge help from the
community.

Disclosure: I have only minimal scanned the net for this kind of material,
and have never used any of it myself.

David J.






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> From: pgsql-novice-owner@postgresql.org [mailto:pgsql-novice-owner@postgresql.org] On Behalf Of Gene Poole
> Sent: Wednesday, September 11, 2013 4:11 PM
> To: pgsql-novice@postgresql.org
> Cc: jpdsys2@comcast.net; etpoole60@comcast.net; jpdsys7@comcast.net; etpoole64@gmail.com; etpoole6465@gmail.com
> Subject: [NOVICE] Will This Work?
>
> When I create a Oracle 11gR2 database we initially use the netca and dbca utilities to create the basic database
filesand network connections. Afterwards we run a bash script to create the application database detail files.  We use
thisbash script to define certain files on specific raid-1 file systems. 
> How would we do this using PostgreSQL?  What is the version of PostgreSQL you would suggest running on RHEL 5.9
x86_64?If I wanted to move from Oracle to PostgreSQL is it possible to use a Oracle export DMP file to load the
PostgreSQLdatabase? 
>
> Thanks,
> Gene Poole

My co-worker and I ported our application from Oracle to PostgreSQL.

I can't answer your questions about netca or dbca created configuration files. I never really used either of those
tools.

We started from scratch with everything which is both a blessing and a curse (mostly a blessing).  Obviously, it look
uslonger than if we had used ora2pg or another tool to port the table structures. Now we have a better grasp of what
PostgreSQLcan and cannot do. We were able to use PostgreSQL features that Oracle lacked. Also our stored functions are
muchcleaner since they were all rewritten from scratch at the same time. 

We are also using RHEL 5.9 x86_64. We could have used the RPM's provided by the community but instead chose to install
fromsource because it gives us more flexibility (our own version of Perl, binaries and data where we want them, etc).
Westarted with 9.0 but switched to 9.1 partway through our conversion. We're running 9.2 now and will be moving to 9.3
soon.If I were in your shoes, I would start with 9.3. 

No, as far as I know, there is no way to use an Oracle dump file to load the PostgreSQL database.

HTH,
Matt


Matthew Musgrove
EF Johnson Technologies, Inc.
Senior Software Engineer
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Gene Poole wrote:
> If I wanted to move from Oracle to PostgreSQL is it possible to use a Oracle export
> DMP file to load the PostgreSQL database?

Oracle goes out of their way to ensure that it is difficult to get data out
of an Oracle database and migrate it somewhere else.
No tool supplied by Oracle will extract the data in a useful format.

If you use Toad (an expensive third party tool), that will do the trick.
There is also ora2pg or oracle_fdw to extract data from Oracle to PostgreSQL.

I'm only speaking about the actual data here, not the metadata.
ora2pg does a good job there, but you'll probably need to do some
stuff by hand or check that ora2pg's suggestions are sane.

Yours,
Laurenz Albe