Company is thinking to migrate oracle db to Postgres plus advance server

Question

Dear all,
We are running with Oracle 11g/10g servers in RAC environment and now company is thinking for going Postgres Plus advance server.
I want to know how much this feasible? if any one has experience.
Or what kind of difficulty may come
My database size would be around 3 to 4 TB
Its online trasaction processing and 24/7 application.
Frond end may be Java. (EJB/struds/Hibernate)
Thanks
Shah

Answer 1

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We are running with Oracle 11g/10g servers in RAC environment and now company is thinking for going Postgres Plus advance server.
I want to know how much this feasible? if any one has experience.
Or what kind of difficulty may come The choice of a database is not a purely technical one. It will depend on
many factors - the principal one being available expertise. If you
have PostgreSQL expertise to hand, then by all means use that
database.
Mogens Nørgaard (founder member of the Oak Table http://www.oaktable.net/)
and a member of the Oracle community of considerable standing said in
the book Oracle Insights says that only the eBays and UPS's of this world
need database features beyond Oracle 7.3.
PostgreSQL certainly has a feature set well beyond that spec.
My database size would be around 3 to 4 TB
Its online trasaction processing and 24/7 application.
Frond end may be Java. (EJB/struds/Hibernate)Your programming environment is irrelevant - all databases have JDBC connectivity
and can work with all major development environments.
Your decision should not be about this - development frameworks change every
two-three years - your data is forever.
My own opinion is that Oracle is overkill for many of the applications for which it
is used - very expensive licencing - don't get me wrong - Oracle is a very impressive
database with a huge number of features that would cost a fortune to implement in-house
(which "tragically" is what many companies try to do).
I don't know the ins and outs of your own application and how much use you make
of Oracle's features - if you can get the same functionality from PostgreSQL for
less money, then go for it, just recognise if there is functionality that you use that
you might have to reimplement if it's not native to PostgreSQL.
DIY database functionality is guaranteed* to be buggy and cause nothing but headaches.
I have refused work in the past with companies that have their own "proprietary"
(they use words like "efficient", "productive" and "customisable"). The problems are that
if you have a problem/issue/bug you can't Google - you're up the creek, but with
PostgreSQL there is a solid user community.
Report back here after you've gone through the process and let people know how it
went - the positives and the negatives - I'd certainly be interested in hearing how the
process turned out for you.
Paul...
Shah