Access methods for multiversion data
SIGMOD '89 Proceedings of the 1989 ACM SIGMOD international conference on Management of data
Evaluation of signature files as set access facilities in OODBs
SIGMOD '93 Proceedings of the 1993 ACM SIGMOD international conference on Management of data
A Simple Analysis of the LRU Buffer Policy and Its Relationship to Buffer Warm-Up Transient
Proceedings of the Ninth International Conference on Data Engineering
Object and File Management in the EXODUS Extensible Database System
VLDB '86 Proceedings of the 12th International Conference on Very Large Data Bases
Fast Text Access Methods for Optical and Large Magnetic Disks: Designs and Performance Comparison
VLDB '88 Proceedings of the 14th International Conference on Very Large Data Bases
A Performance Evaluation of OID Mapping Techniques
VLDB '95 Proceedings of the 21th International Conference on Very Large Data Bases
Log-Only Temporal Object Storage
DEXA '97 Proceedings of the 8th International Workshop on Database and Expert Systems Applications
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Signatures are bit strings, generated by applying some hash function on some or all of the attributes of an object. The signatures of the objects can be stored separately from the objects themselves, and can later be used to filter out candidate objects during a perfect match query. In an object-oriented database system (OODB) using logical object identifiers (OIDs), an object identifier index (OIDX) is needed to map from logical OID to the physical location of the object. In this paper we show how signatures can be stored in the OIDX, and used to reduce the average object access cost in a system. We also extend this approach to transaction time temporal OODBs (TOODB), where this approach is even more beneficial, because maintaining signatures comes virtually for free. We develop a cost model that we use to analyze the performance of the proposed approaches, and this analysis shows that substantial gain can be achieved.