Thread: Convert / Migrate From Oracle 11gR2 To PostgreSQL ? On CentOS 5.7 x86_64
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?
Thanks,
Gene Poole
+ It's impossible for everything to be true. +
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?
Thanks,
Gene Poole
+ It's impossible for everything to be true. +
Re: [GENERAL] Convert / Migrate From Oracle 11gR2 To PostgreSQL ? On CentOS 5.7 x86_64
From
"Tomas Vondra"
Date:
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
Re: [GENERAL] Convert / Migrate From Oracle 11gR2 To PostgreSQL ? On CentOS 5.7 x86_64
From
Gene Poole
Date:
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. +
> 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. +