Database Migration Help/Suggestions Needed Plzzz Share You Views

Dear Sirs
Please help me in my database migration from old database to new database, as we have developed new application and want to switch from old but with using same data(not same database, instead with new and different structure) from old database so
what i did are bellow thing ;
1. Created new database with different database structure from old
2. Used export command to export all data and restore it to one dummy database with (database structure as old database)
3. created "insert into (select .......)" scripts to fetch out the data and put it into new database (with different structure)
4.i verified and tested that data and did cross checking with old data.
Now my problem
1..Now my problem is that since we took backup on Dec 2010 and did all these activity and with that old database was operational so now more data is added from Dec 2010 till now(17/102011) how to take backup of that.
2...And sir if somehow we able to do(till then i don’t know how) that then doing this whole procedure will again take few more days then we will again be trailing becoz old database is operational and will be until we do not switch to new with complete data.
how to solve this problem of migration becz i cant put my old database down also for more then 4-5 hours to switch to new application
Total database is approx: 60 GB
Kindly help or give your expert suggestions as i am in great need of solution to my this problem
Thanks

839880 wrote:
Dear Sirs
Please help me in my database migration from old database to new database, as we have developed new application and want to switch from old but with using same data(not same database, instead with new and different structure) from old database so
what i did are bellow thing ;
1. Created new database with different database structure from old
2. Used export command to export all data and restore it to one dummy database with (database structure as old database)
3. created "insert into (select .......)" scripts to fetch out the data and put it into new database (with different structure)
4.i verified and tested that data and did cross checking with old data.
Now my problem
1..Now my problem is that since we took backup on Dec 2010 and did all these activity and with that old database was operational so now more data is added from Dec 2010 till now(17/102011) how to take backup of that.
2...And sir if somehow we able to do(till then i don’t know how) that then doing this whole procedure will again take few more days then we will again be trailing becoz old database is operational and will be until we do not switch to new with complete data.
how to solve this problem of migration becz i cant put my old database down also for more then 4-5 hours to switch to new application
Total database is approx: 60 GB
Kindly help or give your expert suggestions as i am in great need of solution to my this problem
ThanksWhat is the old database? WHat is the new databse? I'm assuming they are both Oracle but different versions? If so, what versions? Have you considered using a db link from the new to the old and INSERT INTO ... SELECT ... FROM OLD_TABLE@DBLINK?

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