TOPAZ: a Cost-Based, Rule-Driven, Multi-Phase Parallelizer

Summary: TOPAZ is a cost-based, rule-driven, multi-phase parallelizer for queries. Global-plan pruning and top-down search over operator/architecture abstractions enable speedups at low resource cost, leveraging iterators and data rivers to integrate with object-relational systems. (summarized by gpt-5-nano on Feb 09 2026)

Paper ID: 8493
Venue: VLDB
Year: 1998
Pagerank: 4.1945683e-05
Overall Rank: 12,745 | 11.34%
DOI: -

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Authors

1. Clara Nippl
2. Bernhard Mitschang

Incoming Citations (Sorted by Pagerank)

Showing 0 of 0 citing papers.

Rank	Citing Paper	Year	Venue	Pagerank

Outgoing Citations (Sorted by Pagerank)

Showing 19 of 19 cited papers.

Citations counted here include only citations to other VLDB/SIGMOD/CIDR/PODS papers in this database.

Rank	Cited Paper	Year	Venue	Pagerank
151	Optimizing Queries across Diverse Data Sources	1997	VLDB	0.00041016476
219	Grammar-like Functional Rules for Representing Query Optimization Alternatives	1988	SIGMOD	0.00033244259
423	Measuring the Complexity of Join Enumeration in Query Optimization	1990	VLDB	0.00023669348
438	Query Optimization for Parallel Execution	1992	SIGMOD	0.00023199245
1,063	Tradeoffs in Processing Complex Join Queries via Hashing in Multiprocessor Database Machines	1990	VLDB	0.00014362773
1,354	Managing Intra-operator Parallelism in Parallel Database Systems	1995	VLDB	0.00012408166
2,044	Optimization of Multi-Way Join Queries for Parallel Execution	1991	VLDB	9.6953608e-05
2,216	On Parallel Processing of Aggregate and Scalar Functions in Object-Relational DBMS	1998	SIGMOD	9.2699038e-05
2,303	Parallel evaluation of multi-join queries	1995	SIGMOD	9.066178e-05
2,417	Dynamic Load Balancing in Hierarchical Parallel Database Systems	1996	VLDB	8.8604775e-05
2,765	On the Effectiveness of Optimization Search Strategies for Parallel Execution Spaces	1993	VLDB	8.1572726e-05
2,869	The Complexity of Transformation-Based Join Enumeration	1997	VLDB	7.9808408e-05
3,124	Parallel Query Scheduling and Optimization with Time- and Space-Shared Resources	1997	VLDB	7.5201555e-05
3,260	On Optimal Processor Allocation To Support Pipelined Hash Joins	1993	SIGMOD	7.3122611e-05
3,404	EROC: A Toolkit for Building NEATO Query Optimizers	1996	VLDB	7.1321923e-05
3,422	Multi-Join Optimization for Symmetric Multiprocessors	1993	VLDB	7.1134801e-05
5,676	Efficient and Accurate Cost Models for Parallel Query Optimization	1996	PODS	5.376109e-05
5,862	The Query Optimizer in Tandem's new ServerWare SQL Product	1996	VLDB	5.298624e-05
9,659	A Plan-Operator Concept for Client-Based Knowledge Processing	1993	VLDB	4.3109001e-05

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