How z/OS resolves contention problems

When contention exists on a hash class, z/OS® uses XCF messages to resolve the conflict.

This is how it determines which specific resources are involved in the contention, or if the contention is false. For speedy resolution of contention situations, ensure no queuing of messages exists for XCF message buffers. You can use the XCF Activity Report of RMF to detect this queuing.