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You can use the upgrade assistant.
I have worked on it and this works fine. Only issue I noticed is an eventhandler. You have to do manually for it rest Access policy, Provisioning work flow, Approval work flow, scheduled task ..etc. are working fine.
follow below step.
1. take a backup of 9102 OIM DB
2. upgrade existing 9102 OIMDB schema for 11g(
3. create other schema DEV_MDS, DEV_SOAINFRA..etc. using RCU.
4. If the existing one on weblogic then no need to install else you can install weblogic
4. install OIM11g using oim 11g installer
5. install SOA
6. configure design console
7 . run your upgrade assistant
I have upgraded my project from 9102 to OIM 11g. Here are some pointer which might help you during upgrade.
1. What is the complexity of upgrade process?
You can follow through the steps given in document. You'll face problem while restarting your server. You would require to open enterprise manager http://weblogicusr:port/em and right click on domain, goto security->credentials, expand oim, add .xldatabasekey and its credentials.
Keep backup of your old .xldatabasekey, as you have to put it under <DOMAIN_HOME>/fmwconfig/config directory. Otherwise you'll not be able to login into database.
This process doesn't increase size of fields in usr tables. you may require to increase its size (atleast for usr_password to 200). It upgrades all components except eventhandlers and custom schedule tasks. You would require workarounds to make them work. OIM API may still be a issue, as many of them have been deprecated.
2. Does all the approval workflows gets converted into SOA composites successfully?
Yes, it converted in my case. I tested 3 level approvals as well. They are working fine.
I hope this helps.
Must remember this
before upgrade goto-><DOMAIN_HOME>/fmwconfig/config directory and backup *.xldatabasekey*
Once upgrade finished login enterprise manager using url "http://weblogicusr:port/em" and right click on domain
then goto->security->credentials, expand oim and add .xldatabasekey here
Otherwise you were not able to login oim.