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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
12432
Venue
VLDB
Year
2020
Pagerank
8.190416e-05
Overall Rank
2,734 | 81.25%
DOI
10.14778/3368289.3368303

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 29 of 29 citing papers.

Rank Citing Paper Year Venue Pagerank
1,430 VHP: Approximate Nearest Neighbor Search via Virtual Hypersphere Partitioning 2020 VLDB 0.0001080902
1,802 HVS: Hierarchical Graph Structure Based on Voronoi Diagrams for Solving Approximate Nearest Neighbor Search 2022 VLDB 9.7284341e-05
2,010 iDEC: Indexable Distance Estimating Codes for Approximate Nearest Neighbor Search 2020 VLDB 9.3085202e-05
2,346 Series2Graph: Graph-based Subsequence Anomaly Detection for Time Series 2020 VLDB 8.7168932e-05
2,534 ELPIS: Graph-Based Similarity Search for Scalable Data Science 2023 VLDB 8.4561875e-05
2,572 DeltaPQ: Lossless Product Quantization Code Compression for High Dimensional Similarity Search 2020 VLDB 8.4027322e-05
3,240 Graph-Based Vector Search: An Experimental Evaluation of the State-of-the-Art 2025 SIGMOD 7.6071649e-05
4,212 Data Series Progressive Similarity Search with Probabilistic Quality Guarantees 2020 SIGMOD 6.8283344e-05
5,231 Hercules Against Data Series Similarity Search 2022 VLDB 6.3068064e-05
5,800 DET-LSH: A Locality-Sensitive Hashing Scheme with Dynamic Encoding Tree for Approximate Nearest Neighbor Search 2024 VLDB 6.0850924e-05
6,093 High-Dimensional Vector Similarity Search: From Time Series to Deep Network Embeddings 2020 SIGMOD 5.978635e-05
6,148 Steiner-Hardness: A Query Hardness Measure for Graph-Based ANN Indexes 2024 VLDB 5.9593368e-05
6,691 Dumpy: A Compact and Adaptive Index for Large Data Series Collections 2023 SIGMOD 5.8011086e-05
7,145 Subspace Collision: An Efficient and Accurate Framework for High-dimensional Approximate Nearest Neighbor Search 2025 SIGMOD 5.6908957e-05
8,622 Accelerating Product Quantization Query Execution Runtime 2021 SIGMOD 5.3985954e-05
9,278 Odyssey: A Journey in the Land of Distributed Data Series Similarity Search 2023 VLDB 5.2936898e-05
9,360 DARTH: Declarative Recall Through Early Termination for Approximate Nearest Neighbor Search 2026 SIGMOD 5.2819088e-05
9,377 LeaFi: Data Series Indexes on Steroids with Learned Filters 2025 SIGMOD 5.2755515e-05
9,407 RWalks: Random Walks as Attribute Diffusers for Filtered Vector Search 2025 SIGMOD 5.2751121e-05
9,479 dCAM: Dimension-wise Class Activation Map for Explaining Multivariate Data Series Classification 2022 SIGMOD 5.2634238e-05
9,964 DIDS: Double Indices and Double Summarizations for Fast Similarity Search 2024 VLDB 5.18753e-05
10,036 VStream: A Distributed Streaming Vector Search System 2025 VLDB 5.173224e-05
10,193 An In-Depth Study of Filter-Agnostic Vector Search on a PostgreSQL Database System: [Experiments & Analysis] 2026 SIGMOD 5.093636e-05
10,297 TaCo: Data-adaptive and Query-aware Subspace Collision for High-dimensional Approximate Nearest Neighbor Search 2026 SIGMOD 5.093636e-05
10,629 MS-Index: Fast Top-k Subsequence Search for Multivariate Time Series under Euclidean Distance 2026 VLDB 5.093636e-05
10,747 A Structured Study of Multivariate Time-Series Distance Measures 2025 SIGMOD 5.093636e-05
11,107 Representative Time Series Discovery for Data Exploration 2025 VLDB 5.093636e-05
11,316 DeepSketch: A Query Sketching Interface for Deep Time Series Similarity Search 2024 VLDB 5.093636e-05
11,435 Accelerating Similarity Search for Elastic Measures: A Study and New Generalization of Lower Bounding Distances 2023 VLDB 5.093636e-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 0.001157935
41 Fast Subsequence Matching in Time-Series Databases 1994 SIGMOD 0.00046675394
56 M-tree: An Efficient Access Method for Similarity Search in Metric Spaces 1997 VLDB 0.00040719947
85 The X-tree: An Index Structure for High-Dimensional Data 1996 VLDB 0.00035405879
93 Fast Approximate Nearest Neighbor Search With The Navigating Spreading-out Graph 2019 VLDB 0.00034701237
190 Locally Adaptive Dimensionality Reduction for Indexing Large Time Series Databases 2001 SIGMOD 0.00026105472
705 HD-Index: Pushing the Scalability-Accuracy Boundary for Approximate kNN Search in High-Dimensional Spaces 2018 VLDB 0.00014829964
864 The Pyramid-Technique: Towards Breaking the Curse of Dimensionality 1998 SIGMOD 0.00013522522
898 Querying and Mining of Time Series Data: Experimental Comparison of Representations and Distance Measures 2008 VLDB 0.00013339042
1,137 A Cost Model For Nearest Neighbor Search in High-Dimensional Data Space 1997 PODS 0.00012027131
2,101 A Cost Model for Similarity Queries in Metric Spaces 1998 PODS 9.1657486e-05
3,037 The Lernaean Hydra of Data Series Similarity Search: An Experimental Evaluation of the State of the Art 2019 VLDB 7.8275859e-05
5,244 Top-k Nearest Neighbor Search In Uncertain Data Series 2015 VLDB 6.3018164e-05
7,608 Uncertain Time-Series Similarity: Return to the Basics 2012 VLDB 5.5845913e-05
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Semantically Similar Papers

# Overall Rank Paper Year Venue
1 810 Similarity-Based Queries for Time Series Data 1997 SIGMOD
2 6,093 High-Dimensional Vector Similarity Search: From Time Series to Deep Network Embeddings 2020 SIGMOD
3 6,756 On Efficiently Searching Trajectories and Archival Data for Historical Similarities 2008 VLDB
4 9,964 DIDS: Double Indices and Double Summarizations for Fast Similarity Search 2024 VLDB
5 46 A Quantitative Analysis and Performance Study for Similarity-Search Methods in High-Dimensional Spaces 1998 VLDB
6 21 Similarity Search in High Dimensions via Hashing 1999 VLDB
7 4,212 Data Series Progressive Similarity Search with Probabilistic Quality Guarantees 2020 SIGMOD
8 3,486 Scalable, Variable-Length Similarity Search in Data Series: The ULISSE Approach 2018 VLDB
9 5,231 Hercules Against Data Series Similarity Search 2022 VLDB
10 3,037 The Lernaean Hydra of Data Series Similarity Search: An Experimental Evaluation of the State of the Art 2019 VLDB