Explanations of Headings for Variations Statistics

HeadingExplanation
DateThe date to which this line of statistics applies.
Number of Requests The total number of Play requests logged by the www.music.indiana.edu web server.
Number Retrieved The total number of items which were retrieved from the tape archives on this day.
Percent from Disk Cache The percentage of play requests which were satisfied without having to retrieve the items from the tape archives.
Longest Retrieval (min) The longest time, in minutes, that the tape retrieval system required to retrieve a single item.
Shortest Retrieval (min) The shortest time, in minutes, that the tape retrieval system required to retrieve a single item.
Average Retrieval (min) The average time, in minutes, that the tape retrieval system required to retrieve a single item.
Longest Wait Time (min) The longest time, in minutes, that a patron was required to wait for the retrieval of a single item. This will be different from the Longest Retrieval Time if one or more users were placed on the retrieval queue.
Shortest Wait Time (min) The shortest time, in minutes, that a patron was required to wait for the retrieval of a single item.
Average Wait Time (min) The average time, in minutes, that patrons were required to wait for the retrieval of a single item.
More Than 6 Minutes The number of retrievals whose total wait times were more than 6 minutes.
Number of Errors The number of times the retrieval of an item failed. Errors can be caused by improper URLs (pointing to non-existent items) or actual tape machine errors, among other causes.
Number Cancelled The number of items which were cancelled by a patron before the actual tape retrieval started.
Cache Percent Full The is the percentage of the Disk Cache which is currently being used to temporarily store items.
Least Days in Cache On the days following a Cache Cleaning, this is the least amount of time, in days, which an item remained in the Disk Cache.
If a Cache Cleaning has not occurred, then this number will be zero.