If in DEV environment, we have problem with unnamed and unneeded snaphots, read the item1 for understanding unnamed snapshots.
For higher environments, we just have unneeded snapshots.
1. Clear unnamed snapshots:
http://pic.dhe.ibm.com/infocenter/dmndhelp/v8r5m0/index.jsp?topic=%2Fcom.ibm.wbpm.admin.doc%2Fmanaginglib%2Ftopic%2Fmanaging_snapshots_j.html
2. Clear unneeded snapshots:
http://pic.dhe.ibm.com/infocenter/dmndhelp/v8r5m0/index.jsp?topic=%2Fcom.ibm.wbpm.admin.doc%2Fmanaginglib%2Ftopic%2Fmanaging_snapshots_i.html