Optimal Flexible Architecture

About the Optimal Flexible Architecture Standard

Oracle Optimal Flexible Architecture (OFA) provides directory, naming, permission, and configuration guidelines for organizing Oracle software and databases. It supports coexistence of multiple database versions and owners, simplifies administration and expansion, and helps associate Oracle Base locations with Automatic Diagnostic Repository data for incident collection. Oracle recommends accepting the installer’s OFA defaults, particularly for large or multi-database environments.

About Multiple Oracle Homes Support

Oracle AI Database supports multiple Oracle homes on the same system, allowing different releases and databases to coexist when each release is installed in a separate home. OFA-compliant naming and mount points simplify administration, protect user home directories, and support multiple owners and versions. Each installation requires extracting the image and running setup from its own home; newer releases can access older databases only for upgrades, and multiple releases must not share one Oracle home.

About the Oracle Inventory Directory and Installation

The Oracle Inventory directory, or oraInventory, records all Oracle software installations and is shared by installation owners through the OINSTALL group. Existing installations use the inventory identified by /etc/oraInst.loc; new installations determine its location from ORACLE_BASE, an available OFA path, or the installing user’s home directory. Oracle Universal Installer places database homes beneath Oracle Base, while Grid Infrastructure homes use distinct locations and may become root-owned after installation.

Oracle Base Directory Naming Convention

Oracle Base directories should follow the /pm/h/u pattern, combining a mount point, standard directory, and installation owner name. A base can support multiple installations, but separate operating system owners require separate bases, preferably with unique owners for log isolation. Consistent mount paths simplify inventory management, and neither Oracle Base nor its parent directories may be symbolic links.

Oracle Home Directory Naming Convention

Oracle homes conventionally use the /pm/s/u/product/v/type_n structure, identifying the mount point, standard directory, owner, software version, installation type, and optional installation counter. A typical database home is /u01/app/oracle/product/23.0.0/dbhome_1; separate counters permit multiple products of the same type under one Oracle Base. Oracle homes and all parent directories up to root must be physical directories rather than symbolic links.

Optimal Flexible Architecture File Path Examples

OFA-compliant layouts organize inventory, Oracle Base and home directories, administration files, recovery areas, data files, client software, and Grid Infrastructure across structured mount points such as /u01 through /u04. They support multiple database homes and databases while distinguishing standalone-server Grid homes from cluster Grid homes, with Grid binaries outside the Grid Base for clusters. Oracle ASM is recommended for redundancy and throughput, and private or application files should not be stored within OFA directories.
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