Data file duration

The system allows to select the duration of historical files on disk, that is to limit the samples recorded in the file to a certain period.
In this way it is possible to divide the sampled data among several files, of smaller size and easier to manage.
The sampler generates a new file every time the duration of the previous one expires; the number of historical files to keep in the archive can be established by the user.

To specify the duration of the historical files of a group:

Select the group to specify the duration of the history file.
Select the Archive tab.
Select in the duration of the desired file duration. The following lengths are available:

daily	Historical file of daily duration. The name of the log file (not editable) is made in the format D <yyyy> <mm> <dd> .dat, For example D20120127.dat
Monthly	Historical file of monthly duration. The name of the log file (not editable) is made in the format M <yyyy> <mm> .dat, for example M201201.dat
Annual	Historical file of annual duration. The name of the log file (not editable) is made in the form Y <yyyy> .dat, for example Y2012.dat
unlimited	Historical file of unlimited duration. You can specify the name of the historical file in the Template field. Note:in addition to a fixed name, it is possible to specify configuration flags that allow to insert in the file name, for example the current year, the name of the group, etc. For further information, refer to the paragraph "Customizing the name of the historical archive".
Template	The duration and the file name are customized using configuration flags to be specified in the Template field. For further information, refer to the paragraph "Customizing the name of the historical archive".

Note: the system allows you to specify the number of files to keep in the archive using the Backup field. When the number of historical files generated for the group reaches the number of copies specified in the Backup field, the system automatically deletes the oldest file in the archive.