Hi Justin
The schemas are totally different. So it looks like the migration tools
are not going to help me. I will be selecting from a few tables in DB2
and inserting that into one table in Oracle for example. So I´m slowly
coming to that conclusion that
the easiest way is either to use ASCII files or Heterogenous Services,
I´ve never used them. Is it very complicated to set it up?
Justin Cave (DDBC) wrote:
How much data are you talking about moving? What sort of window do you have to move the data? I'm assuming that you will be shutting down the DB2 database, migrating the data, and then bringing up the Oracle database-- how long can the system be unavailable?
How close are the two schemas structurally? If they are radically different, Migration Workbench is probably a bad idea.
ASCII files are a good option, but that will involve writing all the data to disk, copying it around the network, loading it into the database, and manipulating the data into the new schema. That's a lot of copying if there is a lot of data or a small window. You may be able to move more data more quickly if you set up Heterogeneous Services and create a database link to the DB2 database from Oracle-- that would also let you do the transformation processing in parallel. From a setup and configuration perspective, however, this will be more work than text file extracts.
Justin Cave Distributed Database Consulting, Inc. http://www.ddbcinc.com/askDDBC
-----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Birkir Bjornsson Sent: Wednesday, March 10, 2004 4:49 PM To: oracle-l@xxxxxxxxxxxxx Subject: Re: DB2 to Oracle migration
Hi Justin
Thanks for your response. Well Im migrating the database only once. The thing is that I have to extract the data from DB2 to an already made schema in Oracle.
So could I use Oracle Migration Workbench, or should I just make an ASCI file with the data from DB2 and use SQLLoader to insert it to Oracle. What would you
say is the easiest way? Or do you have some other hint for me?
Thanks in advance
Kind Regards -Bippi
Justin Cave (DDBC) wrote:
Is the question about a one-time migration, i.e. moving an application that is currently accessing DB2 to access Oracle, in which case the Oracle Migration Workbench is probably a good first step? Or is the question about regularly migrating data from DB2 to Oracle, i.e. replication, in which case Heterogeneous Connectivity would be a good approach?
If the question is the former-- a complete move from one database to another-- be aware that you will probably have to invest a significant amount of time after the Migration Workbench moves the code to Oracle to get equivalent performance from Oracle. In general, applications are going to do things that work really well in one database but that aren't appropriate in another database. Migration Workbench will do a relatively dumb conversion of the code, which is fine for 60% of the cases, but you'll have to manually fix up the other 40%.
Justin Cave Distributed Database Consulting, Inc. http://www.ddbcinc.com/askDDBC
-----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Birkir Bjornsson Sent: Wednesday, March 10, 2004 7:40 AM To: oracle-l@xxxxxxxxxxxxx Subject: DB2 to Oracle migration
Hi
I have to migrate a DB2 database to Oracle and was wondering if any of you have ever done it and have some hints
for me.
Thanks in advance Bippi
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