DFS3499I ACTIVE DDNAMES: modblks-name acblib-name format-name MODSTAT ID: nnnn

This message indicates online change status including the active online change libraries and the current modify ID. IMS issues this message when the following IMS commands are entered from the master terminal or system console:

• IMS restart
• Simple checkpoint
• /MODIFY PREPARE, to indicate the current active online change libraries before the new definitions are committed
• /MODIFY COMMIT, to indicate the new active online change libraries, after online change is committed

In the message text:

modblks-name

Active MODBLKS DD in the IMS JCL, that identifies the active MODBLKS library. modblks-name is either MODBLKSA or MODBLKSB. If the MODBLKS DD cards are omitted from the IMS JCL and online change for MODBLKS is disabled, this variable is blank.

acblib-name

Active IMSACB DD in the IMS JCL, that identifies the active ACBLIB library. acblib-name is either IMSACBA or IMSACBB.

format-name

Active FORMAT DD in the IMS JCL, that identifies the active MFS format library. format-name is either FORMATA or FORMATB. If this system is DBCTL, format-name is blank.

nnnn

Modify ID number. When you initialize the MODSTAT data set, you decide what number to assign as the modify ID. Every time online change is successful, this number increments by 1. If you initialized this number to 0, the value indicates how many online changes have been successful since cold start. The modify ID is used to recover security status during an emergency restart.

This message is also issued after:

• Simple checkpoint invoked by /DBD
• Simple checkpoint invoked by /DBR
• Simple checkpoint invoked by /CHE