4.3.1 Record retention periods in the Store database

The names of the directories used to store the Store database data are based on the date on which data was first stored in the directory. The date is based on GMT. For this reason, in a system whose time zone is earlier than GMT, there might be more storage directories than the value specified for the retention period. For example, in a system set to JST (GMT +09:00), the name of the directory is based on the date nine hours before the point when data was first stored in the directory. As a result, the name of the directory can indicate an earlier date than the date from which the data in the directory was collected.

For example, in a system in the JST time zone with the retention period for weekly records set to 2 (weeks), weekly records will be stored across three directories. When the current date is October 22nd (Wed), the Store database contains records for the period from 10/8 to 10/22. The performance data for 10/8 is stored in the directory 1005, which is the GMT equivalent of the date (10/6) on which weekly records were first stored in the directory. Similarly, performance data for the current week is stored in the directory 1019. Accordingly, there are three storage directories, 1005, 1012, and 1019, as shown in the following figure.

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