>>-+-/CQCHKPT-+--+-SYSTEM--+--STRUCTURE-------------------------> '-/CQC-----' '-SHAREDQ-' .---------------. V | >--+---structurename-+-+--------------------------------------->< '-ALL---------------'
Table 28 lists the environments (DB/DC, DBCTL, and DCCTL) from which the command and keywords can be issued.
Command / Keywords | DB/DC | DBCTL | DCCTL |
---|---|---|---|
/CQCHKPT | X | X | |
SHAREDQ | X | X | |
STRUCTURE | X | X | |
SYSTEM | X | X |
/CQCHKPT initiates a CQS checkpoint for a specific coupling facility list structure or all the coupling facility list structures to which the IMS subsystem is connected.
This command sends the DFS058 CQCHKPT COMMAND IN PROGRESS message to the inputting terminal, and sends an asynchronous response to the system console and master terminal when the CQS checkpoint is complete.
This command is valid only in a shared-queues environment.
During a structure checkpoint, every CQS connected to that structure also takes a system checkpoint.
Recommendation: When possible, issue this command when it will have the least performance impact to your online IMS subsystems.
Entry ET:
/CQCHKPT SYSTEM STRUCTURE IMSMSGQ01
Response ET:
DFS058I CQCHKPT COMMAND IN PROGRESS CQS0030I SYSTEM CHECKPOINT COMPLETE, STRUCTURE IMSMSGQ01 , LOGTOKEN 0000000001687D3F CQS1CQS DFS1972I CQCHKPT SYSTEM COMMAND COMPLETE FOR STRUCTURE=IMSMSGQ01
Explanation: A CQS system checkpoint completes successfully.
Recommendation: Record the log token displayed in the CQS0030I message because you might need it for a CQS restart.
Entry ET:
/CQCHKPT SHAREDQ STRUCTURE IMSMSGQ01
Response ET:
DFS058I CQCHKPT COMMAND IN PROGRESS CQS0220I CQS CQS1CQS STARTED STRUCTURE CHECKPOINT FOR STRUCTURE IMSMSGQ01 CQS1CQS CQS0200I STRUCTURE IMSMSGQ01 QUIESCED FOR STRUCTURE CHECKPOINT CQS1CQS CQS0201I STRUCTURE IMSMSGQ01 RESUMED AFTER STRUCTURE CHECKPOINT CQS1CQS CQS0030I SYSTEM CHECKPOINT COMPLETE, STRUCTURE IMSMSGQ01 , LOGTOKEN 0000000001688652 CQS1CQS CQS0221I CQS CQS1CQS COMPLETED STRUCTURE CHECKPOINT FOR STRUCTURE IMSMSGQ01 CQS1CQS DFS1972I CQCHKPT SHAREDQ COMMAND COMPLETE FOR STRUCTURE=IMSMSGQ01
Explanation: A CQS structure checkpoint for a specific structure completes successfully.