A persistent search allows the client to continue receiving new results whenever changes are made to data that is in the scope of the search, thus using the search as a form of change notification. The optional changetype setting defines the kinds of updates that result in notification. If you do not set the changetype, the default behavior is to send notifications for all updates. add Send notifications for LDAP add operations. del delete Send notifications for LDAP delete operations. mod modify Send notifications for LDAP modify operations. moddn modrdn modifydn Send notifications for LDAP modify DN (rename and move) operations. all any Send notifications for all LDAP update operations. The optional changesonly setting defines whether the server returns existing entries as well as changes. true Do not return existing entries, but instead only notifications about changes. This is the default setting. false Also return existing entries. The optional entrychgcontrols setting defines whether the server returns an Entry Change Notification control with each entry notification. The Entry Change Notification control provides additional information about the change that caused the entry to be returned by the search. In particular, it indicates the change type, the change number if available, and the previous DN if the change type was a modify DN operation. true Do request the Entry Change Notification control. This is the default setting. false Do not request the Entry Change Notification control.