| ODBC: Version 5 compatibility | File locations and the compatibility library |
| old_row_cursor: deprecated in version 9.0.0 | MobiLink behavior changes |
| OLE DB provider: new feature in version 7.0.0 | Adaptive Server Anywhere new features |
| online help: new features in version 8.0.0 | Documentation |
| OPEN statement: behavior change in version 8.0.0 | Adaptive Server Anywhere behavior changes |
| OPENXML function: new feature in 9.0.0 | Adaptive Server Anywhere new features |
| OPTIMIZATION_GOAL option: default setting changed in 8.0.2 | Adaptive Server Anywhere behavior changes |
| OPTIMIZATION_GOAL option: new feature in version 7.0.0 | Adaptive Server Anywhere new features |
| OPTIMIZATION_GOAL option: new feature in version 8.0.0 | Query processing and database performance |
| ORDER BY clause: enhancement in 9.0.0 | Adaptive Server Anywhere new features |
| outer joins: new Transact-SQL feature in version 7.0.0 | Adaptive Server Anywhere new features |
| outer joins: Transact-SQL behavior changes | Major upgrading issues |
| outer reference aggregate functions: user-defined behavior change in version 8.0.0 | Adaptive Server Anywhere behavior changes |
| output redirection: new features in version 7.0.0 | Adaptive Server Anywhere new features |
| OUTPUT statement: enhancement in version 9.0.0 | Adaptive Server Anywhere new features |
| OUTPUT statement: new features in version 8.0.0 | Development and administration tools |