Example recovery procedures on z/OS

Use this topic as a reference for various recovery procedures.

This topic describes procedures for recovering IBM MQ after various error conditions. These error conditions are grouped in the following categories:

Problem category	Problem	Where to look next
Shared queue problems	Conflicting definitions for both private and shared queues.	Shared queue problems
Active log problems	Dual logging is lost. Active log has stopped. One or both copies of the active log data set are damaged. Write errors on active log data set. Active log is becoming full or is full. Read errors on active log data set.	Active log problems
Archive log problems	Insufficient DASD space to complete offloading active log data sets. Offload task has terminated abnormally. Archive data set allocation problem. 1 Read I/O errors on the archive data set during restart.	Archive log problems
BSDS problems	Error opening BSDS. Log content does not correspond with BSDS information. Both copies of the BSDS are damaged. Unequal time stamps. Dual BSDS data sets are out of synchronization. I/O error on BSDS.	BSDS problems
Page set problems	Page set full. A page set has an I/O error.	Page set problems
coupling facility and Db2 problems	Storage medium full. Db2 system fails. Db2 data-sharing group fails. Db2 and the coupling facility fail.	Coupling facility and Db2 problems
Unit of work problems	A long-running unit of work is encountered.	Problems with long-running units of work
IMS problems	An IMS application terminates abnormally. The IMS adapter cannot connect to IBM MQ. IMS not operational.	IMS-related problems
Hardware problems	Media recovery procedures	Hardware problems

Shared queue problems
Problems occur if IBM MQ discovers that a page set based queue, and a shared queue of the same name are defined.
Active log problems
Use this topic to resolve different problems with the active logs.
Archive log problems
Use this topic to investigate, and resolve problems with the archive logs.
BSDS problems
Use this topic to investigate, and resolve problems with BSDS.
Recovering a CF structure
Conceptually, the data from the previously backed up CF structure is read from the IBM MQ log; the log is read forwards from the backup and any changes are reapplied to the restored structure.
Page set problems
Use this topic to investigate, and resolve problems with the page sets.
Coupling facility and Db2 problems
Use this topic to investigate, and resolve problems with the coupling facility, and Db2.
Problems with long-running units of work
Use this topic to investigate, and resolve problems with long-running units of work.
IMS-related problems
Use this topic to investigate, and resolve problems with IMS and IBM MQ.
Hardware problems
Use this topic as a starting point to investigate hardware problems.

Parent topic: Recovering after failure