....I...S. [ZBXNEXT-2474] added zabbix[vcache,cache,mode] internal item to monitor value
                          cache operating mode (normal/low memmory), updated default
                          zabbix server template.
                          After working 24 hours in low memory mode value cache will 
                          switch back to normal operating mode.

                          Updated data exporting script to force ordering by the first
                          column unless the table references itself.