> > > > > >> We have an Oracle production database with some terbytes of data. > > > >> We wanted > > > >> to migrate that to Postgresql (rigt now...a test database and not > > > >> production) database. > > > >> What are the good options to do that? > > > >> Please advise me on where to look for more information on this > topic > > > > > > > > You have two steps to work on. The first is the DDL, to create > > > > equivalent tables in pgsql as in oracle, the second is to migrate > over > > > > your data. > > > > > > I had done this with the test database. For ddl generation I used > xml/xsl > > and for data migration I used jdbc. I can get the ddl generated fine. > With > > JDBC the data migration is a bit slow. > > My question is abt the data migration. Im not sure how to try this with > an > > online oracle database. We are required to run both postgres and oracle > > database simultaneously for a couple of months (atleast till we decide > > whether we are going to shut down oracle for good !!!). Since the oracle > > database is a production database, It will have updates/inserts during > this > > time. How do you manage that? > > > > About a year ago we converted one of our clients multi-TB ODS systems > built in > Oracle over to PostgreSQL. There's a case study about it you can get from > the > Sun folks at > > http://www.sun.com/third-party/srsc/resources/postgresql/postgre_success_dwp.pdf > > Now, due to the size of the project, we had to run both the Oracle and > Postgres systems in parallel for several months. We kept the data up to > date > using a slew of custom code, designed to replicate data from either the > ODS > system or the OLTP system, depending on various technical and business > factors. My guess is that in your case, you'd want a mix of replicating > data > from the current Oracle database and your application, as best possible. > > Figuring out how you go about replicating the data is certainly easier if > you've have been through it before, but I don't think it is anything too > magical; we went through a number of different ideas and ended up using > multiple methods depending on the data involved. HTH. > Thanks . We have around 3TB of data now running in Oracle. I have done replication in postgresql but not much in Oracle. Is there a way you can replicate between Oracle and Postgresql. For writing the custom codes do you suggest any preferred language ...like java, perl etc?
Thanks Josh
