Convert / Migrate From Oracle 11gR2 To PostgreSQL ? On CentOS 5.7 x86_64

On 7 Prosinec 2011, 15:13, Gene Poole wrote:

This has to do with my personal home environment.

I'm running Oracle 11gR2 DBMS with 4 instances using a single home
directory. For each of the instances I'm using LVM file systems with 10
logical volumes defined (/dbmsu00 used for the install and /dbmsu01 - u09
for the required files created using the DBCA utility). A single LISTENER
created using the NETCA utility.

Not sure why you're doing this, but you can do something similar with
PostgreSQL. Running four clusters using the same set of binaries is not a
big deal.

I chose Oracle because back in the dark ages I was a Oracle DBA when
Oracle 7.3 was current. I've been told that it's OK to download and use
the Oracle DBMS in a noncommercial environment for a limited time - well
it's reached the end of that time. I can't use the free Oracle XE because
the database size limitations (4 GB).

Although this is a PostgreSQL list, I'll point out the limit is 11GB with
the current Oracle XE version (11g).

Based upon what I've read and seen, the best choice for me is PostgreSQL
Community Edition. What I need is advice, documentation, and information
on how to take the above and move it from Oracle to PostgreSQL along with
updating my JBoss 6.0 environment so it has access to the PostgreSQL
databases/instances? Can someone supply me with some direction?

PostgreSQL Community Edition? What is that? Do you mean sources that are
available for download from postgresql.org?

Switching the database in the AS is not a big deal - there's usually a
connection pool, so you need to add PostgreSQL JDBC driver and change the
config.

Porting the application is usually much harder, especially if you use
features that are available on Oracle only (or if you're hurt by some
Oracle-ism). If you're using native SQL, PL/SQL, etc. you'll have to
rewrite that. The complexity really depends on how your application is
coded, it's impossible to judge this.

Anyway, the simplest thing you can do is to give it a try. Install
PostgreSQL on a development environment and try to run the application.
It'll probably fail for some reason - fix the issue and repeat.

There are tools to make the switch easier - e.g. orafce package that
provides some compatibility features.

Tomas

On Wed, 07 Dec 2011 09:13:10 -0500, Gene Poole wrote:

This has to do with my personal home environment.

I'm running Oracle 11gR2 DBMS with 4 instances using a single home
directory. For each of the instances I'm using LVM file systems with 10
logical volumes defined (/dbmsu00 used for the install and /dbmsu01 -
u09 for the required files created using the DBCA utility). A single
LISTENER created using the NETCA utility.

I chose Oracle because back in the dark ages I was a Oracle DBA when
Oracle 7.3 was current. I've been told that it's OK to download and use
the Oracle DBMS in a noncommercial environment for a limited time - well
it's reached the end of that time. I can't use the free Oracle XE
because the database size limitations (4 GB).

Based upon what I've read and seen, the best choice for me is PostgreSQL
Community Edition. What I need is advice, documentation, and information
on how to take the above and move it from Oracle to PostgreSQL along
with updating my JBoss 6.0 environment so it has access to the
PostgreSQL databases/instances? Can someone supply me with some
direction?

I use PostgreSQL at home from *choice* (I am an Oracle DBA at work). But
I don't think there is any time limit on personal non-commercial use of
Oracle EE (you may want to check the OTN Licence Agreement on their
download page).

PostgreSQL is FOSS, so there are no "Editions", by the way.

Lastly, a couple of polite requests: Please do not post HTML, and please
consider carefully before crossposting to multiple groups.

On December 7, 2011, 09:36:20 AM, Tomas Vondra wrote:

Not sure why you're doing this, but you can do something similar with
PostgreSQL. Running four clusters using the same set of binaries is not

a

big deal.

Although this is a PostgreSQL list, I'll point out the limit is 11GB

with

the current Oracle XE version (11g).

PostgreSQL Community Edition? What is that? Do you mean sources that are
available for download from postgresql.org?

Switching the database in the AS is not a big deal - there's usually a
connection pool, so you need to add PostgreSQL JDBC driver and change

the

config.

Porting the application is usually much harder, especially if you use
features that are available on Oracle only (or if you're hurt by some
Oracle-ism). If you're using native SQL, PL/SQL, etc. you'll have to
rewrite that. The complexity really depends on how your application is
coded, it's impossible to judge this.

Anyway, the simplest thing you can do is to give it a try. Install
PostgreSQL on a development environment and try to run the application.
It'll probably fail for some reason - fix the issue and repeat.

There are tools to make the switch easier - e.g. orafce package that
provides some compatibility features.

I guess I didn't explain well enough. I absolutely do not need any Oracle
help, I've a whole team of people at work I can get that information from.
I listed where I am, why I cannot go to the free Oracle (size
limitations), and where I would like to end up (PostgreSQL).

What I'm asking is how to get there and what is the best version of
PostgreSQL to use. Where can I find a 'How To Use PostgreSQL For A Oracle
DBA' type manual. Maybe some tutorials. 'How do I build a PostgreSQL
database that mimics my current Oracle database' type document is what I'm
looking for.

For this type of application I rarely use a RPM. I normally use a ZIP or
tar ball so I can control where it is installed (binaries on one disk,
data on another disk, and the index on yet another disk) how it
configured. OK, I'm a control freak! But that is why I use Linux.

Thanks,
Gene Poole

+ It's impossible for everything to be true. +