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To upgrade to Oracle Database release 184.108.40.206, you must have to install Oracle Grid Infrastructure and Oracle Database software into a new Oracle home .
and before upgrade run Pre-Upgrade Script .
complete guide is available
Your question is already documented. Please review:
Minimizing Downtime During Production Upgrade [ID 478308.1]
Master Note For Oracle Database Upgrades and Migrations [ID 1152016.1]
Different Upgrade Methods For Upgrading Your Database [ID 419550.1]
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