If you applied opatch on database side, you need to run preclone again it will be safer practice
At the same time application patch you applied on APPL_TOP, you need to run preclone
Supposing we are 24x7 and we can not afford to shutdown the database, but we only have online hot RMAN backup.
After running adpreclone, which part of the db tier should I backup using OS tar command?
Is it only the tech_st folder? I can not "tar" backup the app_st tier because the database is up.
Oracle binaries you can take tar backup while database up
tech_st is Oracle binaries which you need to take backup, apps_st is data files.
At the same time Application file system also you can take tar backup while application services up & running
Can I clone only the tech_st at the DR server without the apps_st data files?
Aside from applied patches, what other updates the requires adpreclone to be run?