Official:
The first time you install Oracle Database software on a server, you are prompted to specify the location of the inventory directory, called oraInventory. this directory provides a centralized inventory of all Oracle software products installed on the server. you shoshould use the same value for the Oracle inventory directory each time you perform an Oracle software installation on the server.
Expansion:
1. During the first installation, the OUI will search for directories like "/u01/app" and "/u02/app" in the operating system by default. If yes, it will be placed in this directory, for example: /u01/app/oraInventory
2. If the first type is not found and the ORACLE_BASE directory is set, create oraInventory in the directory above it.
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3. If the preceding two conditions are not met, create them in the user's home directory that executes the OUI, for example,/home/oracle/oraInventory. You can also customize the directory. ensure that you have the permission.