| Analysis of the Request Patterns to the NSSDC On-line Archive (1995) | |||||||||||||||
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| The successful implementation of mass storage archives require careful attention to performance optimizations, to ensure that the system can handle the offered load. However, performance optimizations require an understanding of user access patterns. Since on-line archives and digital libraries are so new, little information is available. The National Space Science Data Center (NSSDC) of NASA Goddard Space Flight Center has run an on-line mass storage archive of space data, the National Data Archive and Distribution Service (NDADS), since November 1991. A large world-wide space research community makes use of NSSDC, requesting more than 20,000 files per month. Since the initiation of their service, NSSDC has maintained log files which record all accesses the archive. In this report, we present an analysis of the NDADS log files, spanning a four year period (1992 - 1995). We analyze the log files and discuss several issues, including caching, reference patterns, changes in us... | |||||||||||||||
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