Portability: Backwards Compatibility
- Portability used to be handled by the optimize option.
- optimize is now deprecated.
- Old scripts work under the new system.
- If optimize gets set to portability
the following drivers go into these modes:
- oci8: DB_PORTABILITY_LOWERCASE and DB_PORTABILITY_DELETE_COUNT
- fbsql, mysql, mysqli, sqlite: DB_PORTABILITY_NUMROWS
- If optimize gets set to performance new portability system is switched off.