https://docs.oracle.com/en/database/oracle/oracle-database/19/ladbi/optimal-flexible-architecture-file-path-examples.html#GUID-BB3EE4F7-50F4-4A2D-8A0D-96B7CC44029B
/
/u01/
/u01/app/
/u01/app/oraInventory
/u01/app/oracle/
Oracle base directory for user oracle.
There can be many Oracle Database installations on a server, and many Oracle Database software installation owners.
/u01/app/grid
Oracle base directory for user grid.
The Oracle home (Grid home) for Oracle Grid Infrastructure for a cluster installation is located outside of the Grid user.
There can be only one Grid home on a server, and only one Grid software installation owner.
The Grid home contains log files and other administrative files
/u02/app/oracle/oradata , /u03/app/oracle/oradata, /u04/app/oracle/oradata
/u01/app/oracle/product/19.0.0/dbhome_1
/u01/app/19.0.0/grid
Oracle home directory for Oracle Grid Infrastructure for a cluster (Grid home),
owned by user grid before installation, and owned by root after installation
/u01/app/oracle/product/19.0.0/client_1
Oracle home directory for Oracle Database Client 1,
owned by Oracle Database installation owner account oracle