Solution Reqd for having less downtime

Hi All
we are migrating the oracle db ver9i to 11g. we have huge data say 40 million. when we check with our dba, they have estimated the downtime to be for 4-5 days. for upgrade and do cathup to a new host with r12. we have many important subscribers for our service, for which they do not give that much time. we have explored many solutions like golden gate and all couldnt find anything usful, but finally decided to collect all dml sqls in an order.
What i need is can we have a schema lelvel trigger to capture all dmls during 4days downtime. if not pls suggest
for any other alternative ways.
Thanks
Surendra

Pl post details of exact versions of OS and database for source and target.
The size of the database or the number of records do not have anything to do with how long the upgrade will take. The 11g software install can be performed in advance and should not take more than an hour. The actual upgrade itself should take no more than 8 to 12 hours, assuming you are upgrading "in-place" (i.e. on the same server). If not, you will need to add time needed to copy the database to the new server, which will take time depending on how big your database is.
An in-place upgrade can be achieved well within 24 hours. Also see these MOS Docs
455744.1 - Best Practices to Minimize Downtime During Upgrade
739485.1 - How to estimate the time required to upgrade a database ?
HTH
Srini

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Simple:
I do this all the time to relocate file system files... But the principle is the same. You can do this in iterations so you do not need to do it all at once:
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SCRIPT-1
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SCRIPT-3
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