Problem: Loss of SCA structure

In a data sharing environment, you might encounter an error that is caused by a loss of SCA structure.

Symptom

The following message appears:

DSN7501I -DB1A csect-name SCA STRUCTURE sca-structure-name CONNECTIVITY FAILURE.

Db2 suspends processing until the SCA is rebuilt, using information contained in Db2 memory.

If the SCA cannot be rebuilt, the following message appears:

DSN7504I -DB1A csect-name SCA STRUCTURE sca-structure-name REBUILD UNSUCCESSFUL.

System action

DSN7503I is issued for a successful rebuild of the SCA. If the rebuild is unsuccessful, all members of the group terminate abnormally with a 00F70600 abend code.

Important: If the SCA cannot be rebuilt, the lost connectivity causes the members of the group to abend. This can happen, for example, if both coupling facilities are volatile and lose power. In this case, a group restart is required.

To avoid situations in which a group restart is necessary, put structures in nonvolatile coupling facility structures.

System programmer action

You must fix the problem that is causing the loss of connectivity. If the problem is not an obvious one (such as a power failure), call IBM® Support. Check the termination code for the reason that the rebuild was unsuccessful.

After the problem is fixed, restart any failed members as quickly as possible to release retained locks. For the loss of SCA structure, if the automatic rebuild occurred normally, processing can continue while you wait for the coupling facility problem to be fixed.