Hi, I use a class in my Product to make LDAP-queries : ------------------ class LDAP_Search: def __init__(self,res): ..... ## and use it in def search_LDAPuser(self, uid): # open a connection l=ldap.open(LDAP_SERVER,LDAP_PORT) # search all users lst=l.search_s(LDAP_BASE_DN,ldap.SCOPE_SUBTREE,"uid=*",["uid","cn"]) # create a List of u_lst=[] for i in lst: u_lst.append(LDAP_Search(i)) return u_lst ---------------------- and I use it with <dtml-in> tags for different Forms. After /Control_Panel/manage_debug I have many thousend objectreferences to instances of this object. I don't know whats the trouble. Don't want to store these objects. (at start, ZOPE tryes to load the objects from the DB). My question is, what is bad at this code? , is there a way to find out, what referes to this objects or/and how to delete them from the DB? Thanks for any help, Torsten