Home

 

Recovering from media images

 

WebSphere MQ automatically recovers some objects from their media image if it finds that they are corrupt or damaged. In particular, this applies to objects found to be damaged during the normal queue manager startup. If any transaction was incomplete when the queue manager last shutdown, any queue affected is also recovered automatically in order to complete the startup operation.

You must recover other objects manually, using the rcrmqobj command, which replays the records in the log to re-create the WebSphere MQ object. The object is re-created from its latest image found in the log, together with all applicable log events between the time the image was saved and the time the re-create command was issued. If a WebSphere MQ object becomes damaged, the only valid actions that can be performed are either to delete it or to re-create it by this method. Nonpersistent messages cannot be recovered in this way.

See rcrmqobj (recreate object) for further details of the rcrmqobj command.

The log file containing the media recovery record, and all subsequent log files, must be available in the log file directory when attempting media recovery of an object. If a required file cannot be found, operator message AMQ6767 is issued and the media recovery operation fails. If you do not take regular media images of the objects that you want to re-create, you might have insufficient disk space to hold all the log files required to re-create an object.

 

Parent topic:

Recovering damaged objects

fa14650_

 

Home