The LHAM Log-Structured History Data Access Method.

Peter Muth, Patrick E. O'Neil, Achim Pick, Gerhard Weikum: The LHAM Log-Structured History Data Access Method. VLDB J. 8(3-4): 199-221(2000)

@article{DBLP:journals/vldb/MuthOPW00,
  author    = {Peter Muth and
               Patrick E. O'Neil and
               Achim Pick and
               Gerhard Weikum},
  title     = {The LHAM Log-Structured History Data Access Method},
  journal   = {VLDB J.},
  volume    = {8},
  number    = {3-4},
  year      = {2000},
  pages     = {199-221},
  ee        = {db/journals/vldb/MuthOPW00.html},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

Abstract

Numerous applications such as stock market or medical information systems require that both historical and current data be logically integrated into a temporal database. The underlying access method must support different forms of "time-travel" queries, the migration of old record versions onto inexpensive archive media, and high insertion and update rates. This paper presents an access method for transaction-time temporal data, called the log-structured history data access method (LHAM) that meets these demands. The basic principle of LHAM is to partition the data into successive components based on the timestamps of the record versions. Components are assigned to different levels of a storage hierarchy, and incoming data is continuously migrated through the hierarchy. The paper discusses the LHAM concepts, including concurrency control and recovery, our full-fledged LHAM implementation, and experimental performance results based on this implementation. A detailed comparison with the TSB-tree, both analytically and based on experiments with real implementations, shows that LHAM is highly superior in terms of insert performance, while query performance is in almost all cases at least as good as for the TSB-tree; in many cases it is much better.

Key Words

Index structures - Storage systems - Performance - Temporal databases - Data warehouses

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