Garbage Collection in Object-Oriented Databases Using Transactional Cyclic Reference Counting.

Prasan Roy, S. Seshadri, Abraham Silberschatz, S. Sudarshan, Srinivas Ashwin: Garbage Collection in Object-Oriented Databases Using Transactional Cyclic Reference Counting. VLDB J. 7(3): 179-193(1998)

@article{DBLP:journals/vldb/RoySSSA98,
  author    = {Prasan Roy and
               S. Seshadri and
               Abraham Silberschatz and
               S. Sudarshan and
               Srinivas Ashwin},
  title     = {Garbage Collection in Object-Oriented Databases Using Transactional
               Cyclic Reference Counting},
  journal   = {VLDB J.},
  volume    = {7},
  number    = {3},
  year      = {1998},
  pages     = {179-193},
  ee        = {db/journals/vldb/RoySSSA98.html},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

Abstract

Garbage collection is important in object-oriented databases to free the programmer from explicitly deallocating memory. In this paper, we present a garbage collection algorithm, called Transactional Cyclic Reference Counting (TCRC), for object-oriented databases. The algorithm is based on a variant of a reference-counting algorithm proposed for functional programming languages The algorithm keeps track of auxiliary reference count information to detect and collect cyclic garbage. The algorithm works correctly in the presence of concurrently running transactions, and system failures. It does not obtain any long-term locks, thereby minimizing interference with transaction processing. It uses recovery subsystem logs to detect pointer updates; thus, existing code need not be rewritten. Finally, it exploits schema information, if available, to reduce costs. We have implemented the TCRC algorithm and present results of a performance study of the implementation.

Key Words

Copyright © 1998 by Springer, Berlin, Heidelberg. Permission to make digital or hard copies of the abstract is granted provided that copies are not made or distributed for profit or direct commercial advantage, and that copies show this notice along with the full citation.

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References

[AFG95]: Laurent Amsaleg, Michael J. Franklin, Olivier Gruber: Efficient Incremental Garbage Collection for Client-Server Object Database Systems. VLDB 1995: 42-53
[ARS+97]: Srinivas Ashwin, Prasan Roy, S. Seshadri, Abraham Silberschatz, S. Sudarshan: Garbage Collection in Object Oriented Databases Using Transactional Cyclic Reference Counting. VLDB 1997: 366-375
[Bro84]: ...
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[CDN93]: Michael J. Carey, David J. DeWitt, Jeffrey F. Naughton: The oo7 Benchmark. SIGMOD Conference 1993: 12-21
[CWZ94]: Jonathan E. Cook, Alexander L. Wolf, Benjamin G. Zorn: Partition Selection Policies in Object Database Garbage Collection. SIGMOD Conference 1994: 371-382
[JL91]: ...
[Lin90]: ...
[MWL90]: Alejandro D. Martínez, Rosita Wachenchauzer, Rafael Dueire Lins: Cycle Reference Counting with Local Mark-Scan. Inf. Process. Lett. 34(1): 31-35(1990)
[PvEP88]: ...
[RSS+98]: ...
[YNY94]: Voon-Fee Yong, Jeffrey F. Naughton, Jie-Bing Yu: Storage Reclamation and Reorganization in Client-Server Persistent Object Stores. ICDE 1994: 120-131

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