human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "efficient data ingestion and query processing for lsm based storage systems"
  Abstract: In recent years, the Log Structured Merge (LSM) tree has been widely adopted by NoSQL and NewSQL systems for its superior write performance. Despite its popularity, however, most existing work has focused on LSM-based key-value stores with only a primary LSM-tree index; auxiliary structures, which are critical for supporting ad-hoc queries, have received much less attention. In this paper, we focus on efficient data ingestion and query processing for general-purpose LSM-based storage systems. We first propose and evaluate a series of optimizations for efficient batched point lookups, significantly improving the range of applicability of LSM-based secondary indexes. We then present several new and efficient maintenance strategies for LSM-based storage systems. Finally, we have implemented and experimentally evaluated the proposed techniques in the context of the Apache AsterixDB system, and we present the results here.

Connected through hyperedge HE-1 (induced by source paper "lsm based storage techniques a survey"):
  with members:
    - "asterixdb a scalable open source bdms"
    - "bigtable merge compaction"
    - "don t thrash how to cache your hash on flash"
    - "optimal aggregation algorithms for middleware"

Connected through hyperedge HE-2 (induced by source paper "bad to the bone big active data at its core"):
  with members:
    - "an idea an ingestion framework for data enrichment in asterixdb"
    - "planetsense a real time streaming and spatio temporal analytics platform for gathering geo spatial intelligence from open source data"
    - "asterixdb a scalable open source bdms"
    - "linview incremental view maintenance for complex analytical queries"

Connected through hyperedge HE-3 (induced by source paper "on performance stability in lsm based storage systems extended version"):
  with members:
    - "lsm based storage techniques a survey"
    - "an idea an ingestion framework for data enrichment in asterixdb"
    - "enabling efficient updates in kv storage via hashing design and performance evaluation"
    - "asterixdb a scalable open source bdms"

Connected through hyperedge HE-4 (induced by source paper "an lsm based tuple compaction framework for apache asterixdb"):
  with members:
    - "lsm based storage techniques a survey"
    - "asterixdb a scalable open source bdms"
    - "the sql query language configurable unifying and semi structured"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.DB(Databases)