Single-phase catalog migration in Db2 12
The Db2 12 catalog migration is accomplished in a single phase.
Migration to the Db2 12 catalog is completed by running the DSNTIJTC job. The following migration modes from previous releases are eliminated in Db2 12:
- Conversion Mode (CM)
- Enabling-new-function mode (ENFM)
- New-function mode (NFM)
- * modes (including CM* and ENFM*)
In Db2 12, you can use Db2 function levels and application compatibility levels to control the adoption of new capabilities and enhancements . For details, see Adopting new capabilities in Db2 12 continuous delivery and Application compatibility levels in Db2 12.
Important: Do not issue the ACTIVATE command or run job DSNTIJAF for activation of Db2 12 until you are certain that the subsystem or data sharing group can proceed on Db2 12, without the possibility of falling back to or coexistence with Db2 11. In data sharing, the ACTIVATE command has group scope. Fallback and coexistence become impossible with the successful activation of function level 500 or higher.
Tip: 
You can determine the catalog level and function level for a Db2 subsystem or data sharing group, and the code levels of individual subsystems or members, by issuing DISPLAY GROUP commands. For more information, see Determining the Db2 code level, catalog level, and function level
You can determine the catalog level and function level for a Db2 subsystem or data sharing group, and the code levels of individual subsystems or members, by issuing DISPLAY GROUP commands. For more information, see Determining the Db2 code level, catalog level, and function level