LaNotte: the TNG metric system after two years of data

The night accounting system laNotte, presented two years ago at SPIE Amsterdam, has now been working without interruption and a wealth of data are becoming available. We can confirm that the human interaction of the night operator is a key factor, so that a manual editor has been given to operator in order to fix all unavoidable errors and misevaluation during the night. The connections with several logging and telemetry databases complete the necessary inputs. We were thus able to monitor the effect of the introduction of a major new instrument (Harps-N@TNG), to measure with accuracy the meteo variability on the Observatory of Roque de los Muchachos, the frequency of technical problems of the various devices. LaNotte complex is also an straightforward way to account for the operations toward funding bodies, providing them with a standard set of data and the quick possibility to look for historic trends.