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Return of the Lernaean Hydra: Experimental Evaluation of Data Series Approximate Similarity Search

Summary: Taxonomy reconciling data-series and multidimensional-vector similarity, with indexing changes for approximate queries with guarantees. Study on synthetic/real data, in-memory and on-disk, showing data-series methods beat disk-based vector baselines and stay competitive in memory. (summarized by gpt-5-nano on Feb 09 2026)

Paper ID
ha803b3e619038378
Venue
VLDB
Year
2020
Pagerank
8.0842027e-05
Overall Rank
2,730 | 81.66%
DOI
10.14778/3368289.3368303
PDF
Download (CC BY-NC-ND 4.0)

Incoming Non-self Citations Over Time

Authors

BibTeX Citation

@article{echihabi_vldb20,
        title = {{Return of the Lernaean Hydra: Experimental Evaluation of Data Series Approximate Similarity Search}},
        author = {Echihabi, Karima and Zoumpatianos, Kostas and Palpanas, Themis and Benbrahim, Houda},
        journal = {PVLDB},
        series = {{VLDB} '20},
        volume = {13},
        number = {3},
        pages = {402--419},
        doi = {10.14778/3368289.3368303},
        url = {https://doi.org/10.14778/3368289.3368303},
        year = {2020}
}

Incoming Citations (Sorted by Pagerank)

Showing 30 of 30 citing papers.

Rank Citing Paper Year Venue Pagerank
1,325 VHP: Approximate Nearest Neighbor Search via Virtual Hypersphere Partitioning 2020 VLDB 0.00011016872
1,681 HVS: Hierarchical Graph Structure Based on Voronoi Diagrams for Solving Approximate Nearest Neighbor Search 2022 VLDB 9.8836287e-05
1,894 iDEC: Indexable Distance Estimating Codes for Approximate Nearest Neighbor Search 2020 VLDB 9.4129766e-05
2,264 ELPIS: Graph-Based Similarity Search for Scalable Data Science 2023 VLDB 8.7286407e-05
2,376 Series2Graph: Graph-based Subsequence Anomaly Detection for Time Series 2020 VLDB 8.5517908e-05
2,444 DeltaPQ: Lossless Product Quantization Code Compression for High Dimensional Similarity Search 2020 VLDB 8.4556406e-05
2,872 Graph-Based Vector Search: An Experimental Evaluation of the State-of-the-Art 2025 SIGMOD 7.9191725e-05
4,305 Data Series Progressive Similarity Search with Probabilistic Quality Guarantees 2020 SIGMOD 6.6740088e-05
4,600 Steiner-Hardness: A Query Hardness Measure for Graph-Based ANN Indexes 2024 VLDB 6.5055567e-05
5,318 Hercules Against Data Series Similarity Search 2022 VLDB 6.1818367e-05
5,530 DET-LSH: A Locality-Sensitive Hashing Scheme with Dynamic Encoding Tree for Approximate Nearest Neighbor Search 2024 VLDB 6.0907372e-05
6,184 High-Dimensional Vector Similarity Search: From Time Series to Deep Network Embeddings 2020 SIGMOD 5.8567387e-05
6,612 Dumpy: A Compact and Adaptive Index for Large Data Series Collections 2023 SIGMOD 5.732933e-05
7,267 Subspace Collision: An Efficient and Accurate Framework for High-dimensional Approximate Nearest Neighbor Search 2025 SIGMOD 5.5677188e-05
7,308 RWalks: Random Walks as Attribute Diffusers for Filtered Vector Search 2025 SIGMOD 5.5559693e-05
7,647 A Structured Study of Multivariate Time-Series Distance Measures 2025 SIGMOD 5.4746904e-05
8,786 Accelerating Product Quantization Query Execution Runtime 2021 SIGMOD 5.2757715e-05
8,859 VStream: A Distributed Streaming Vector Search System 2025 VLDB 5.2621314e-05
9,146 DARTH: Declarative Recall Through Early Termination for Approximate Nearest Neighbor Search 2026 SIGMOD 5.2199557e-05
9,449 Odyssey: A Journey in the Land of Distributed Data Series Similarity Search 2023 VLDB 5.1747125e-05
9,571 LeaFi: Data Series Indexes on Steroids with Learned Filters 2025 SIGMOD 5.154741e-05
9,667 dCAM: Dimension-wise Class Activation Map for Explaining Multivariate Data Series Classification 2022 SIGMOD 5.142891e-05
10,125 DIDS: Double Indices and Double Summarizations for Fast Similarity Search 2024 VLDB 5.0747281e-05
10,421 An In-Depth Study of Filter-Agnostic Vector Search on a PostgreSQL Database System: [Experiments & Analysis] 2026 SIGMOD 4.9769913e-05
10,520 TaCo: Data-adaptive and Query-aware Subspace Collision for High-dimensional Approximate Nearest Neighbor Search 2026 SIGMOD 4.9769913e-05
10,909 ANNiE: A Learned Query Cost Estimator for Graph-Based Approximate Nearest Neighbor Search 2026 VLDB 4.9769913e-05
11,084 MS-Index: Fast Top-k Subsequence Search for Multivariate Time Series under Euclidean Distance 2026 VLDB 4.9769913e-05
11,463 Representative Time Series Discovery for Data Exploration 2025 VLDB 4.9769913e-05
11,640 DeepSketch: A Query Sketching Interface for Deep Time Series Similarity Search 2024 VLDB 4.9769913e-05
11,755 Accelerating Similarity Search for Elastic Measures: A Study and New Generalization of Lower Bounding Distances 2023 VLDB 4.9769913e-05
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Outgoing Citations (Sorted by Pagerank)

Showing 14 of 14 cited papers.

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

Rank Cited Paper Year Venue Pagerank
4 The R*-tree: An Efficient and Robust Access Method for Points and Rectangles 1990 SIGMOD 0.0011402175
42 Fast Subsequence Matching in Time-Series Databases 1994 SIGMOD 0.00045755116
56 M-tree: An Efficient Access Method for Similarity Search in Metric Spaces 1997 VLDB 0.00040363819
74 Fast Approximate Nearest Neighbor Search With The Navigating Spreading-out Graph 2019 VLDB 0.00037145866
90 The X-tree: An Index Structure for High-Dimensional Data 1996 VLDB 0.00034847854
194 Locally Adaptive Dimensionality Reduction for Indexing Large Time Series Databases 2001 SIGMOD 0.00025637823
648 HD-Index: Pushing the Scalability-Accuracy Boundary for Approximate kNN Search in High-Dimensional Spaces 2018 VLDB 0.00015156941
886 The Pyramid-Technique: Towards Breaking the Curse of Dimensionality 1998 SIGMOD 0.00013253709
916 Querying and Mining of Time Series Data: Experimental Comparison of Representations and Distance Measures 2008 VLDB 0.00013093656
1,157 A Cost Model For Nearest Neighbor Search in High-Dimensional Data Space 1997 PODS 0.0001176973
2,077 A Cost Model for Similarity Queries in Metric Spaces 1998 PODS 9.0758123e-05
2,870 The Lernaean Hydra of Data Series Similarity Search: An Experimental Evaluation of the State of the Art 2019 VLDB 7.919641e-05
5,260 Top-k Nearest Neighbor Search In Uncertain Data Series 2015 VLDB 6.2041665e-05
7,760 Uncertain Time-Series Similarity: Return to the Basics 2012 VLDB 5.4567049e-05
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Semantically Similar Papers

# Overall Rank Paper Year Venue
1 829 Similarity-Based Queries for Time Series Data 1997 SIGMOD
2 6,184 High-Dimensional Vector Similarity Search: From Time Series to Deep Network Embeddings 2020 SIGMOD
3 6,894 On Efficiently Searching Trajectories and Archival Data for Historical Similarities 2008 VLDB
4 10,125 DIDS: Double Indices and Double Summarizations for Fast Similarity Search 2024 VLDB
5 45 A Quantitative Analysis and Performance Study for Similarity-Search Methods in High-Dimensional Spaces 1998 VLDB
6 20 Similarity Search in High Dimensions via Hashing 1999 VLDB
7 4,305 Data Series Progressive Similarity Search with Probabilistic Quality Guarantees 2020 SIGMOD
8 3,513 Scalable, Variable-Length Similarity Search in Data Series: The ULISSE Approach 2018 VLDB
9 5,318 Hercules Against Data Series Similarity Search 2022 VLDB
10 2,870 The Lernaean Hydra of Data Series Similarity Search: An Experimental Evaluation of the State of the Art 2019 VLDB