The addressing mode of the application server is established when the application server is started. The addressing mode of the application server is determined by the information stored in the addressing mode (AMODE) field of the SQLDBN file associated with the application server.
The addressing mode of the application requester is always 31-bit addressing.
Single user mode applications are invoked in the addressing mode of the application server. If your single user mode application or user exit requires 24-bit addressing and the addressing mode of the application server is 31-bit, you will need to change the operating mode or the addressing mode of the application server.
If the addressing mode of the application server does not match the addressing mode of the single user mode application, errors may result.
Refer to the DB2 Server for VM System Administration manual for information on single user mode, user exits, and how to determine and change the addressing mode. To determine your dependencies on 24-bit addressing, see the VM/ESA: CMS Application Migration Guide manual.