Search results for: Zhengwei She

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She</title> <meta name="description" content="Search results for: Zhengwei She"> <meta name="keywords" content="Zhengwei She"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" href="https://waset.org"> <img src="https://cdn.waset.org/static/images/wasetc.png" alt="Open Science Research Excellence" title="Open Science Research Excellence" /> </a> <button class="d-block d-lg-none navbar-toggler ml-auto" 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id="custom-search-input"> <div class="input-group"> <i class="fas fa-search"></i> <input type="text" class="search-query" name="q" placeholder="Author, Title, Abstract, Keywords" value="Zhengwei She"> <input type="submit" class="btn_search" value="Search"> </div> </div> </form> </div> </div> <div class="row mt-3"> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Commenced</strong> in January 2007</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 1</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: Zhengwei She</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1</span> Improve B-Tree Index鈥檚 Performance Using Lock-Free Hash Table</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Zhanfeng%20Ma">Zhanfeng Ma</a>, <a href="https://publications.waset.org/abstracts/search?q=Zhiping%20Xiong"> Zhiping Xiong</a>, <a href="https://publications.waset.org/abstracts/search?q=Hu%20Yin"> Hu Yin</a>, <a href="https://publications.waset.org/abstracts/search?q=Zhengwei%20She"> Zhengwei She</a>, <a href="https://publications.waset.org/abstracts/search?q=Aditya%20P.%20Gurajada"> Aditya P. Gurajada</a>, <a href="https://publications.waset.org/abstracts/search?q=Tianlun%20Chen"> Tianlun Chen</a>, <a href="https://publications.waset.org/abstracts/search?q=Ying%20Li"> Ying Li</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Many RDBMS vendors use B-tree index to achieve high performance for point queries and range queries, and some of them also employ hash index to further enhance the performance as hash table is more efficient for point queries. However, there are extra overheads to maintain a separate hash index, for example, hash mapping for all data records must always be maintained, which results in more memory space consumption; locking, logging and other mechanisms are needed to guarantee ACID, which affects the concurrency and scalability of the system. To relieve the overheads, Hash Cached B-tree (HCB) index is proposed in this paper, which consists of a standard disk-based B-tree index and an additional in-memory lock-free hash table. Initially, only the B-tree index is constructed for all data records, the hash table is built on the fly based on runtime workload, only data records accessed by point queries are indexed using hash table, this helps reduce the memory footprint. Changes to hash table are done using compare-and-swap (CAS) without performing locking and logging, this helps improve the concurrency and avoid contention. The hash table is also optimized to be cache conscious. HCB index is implemented in SAP ASE database, compared with the standard B-tree index, early experiments and customer adoptions show significant performance improvement. This paper provides an overview of the design of HCB index and reports the experimental results. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=B-tree" title="B-tree">B-tree</a>, <a href="https://publications.waset.org/abstracts/search?q=compare-and-swap" title=" compare-and-swap"> compare-and-swap</a>, <a href="https://publications.waset.org/abstracts/search?q=lock-free%20hash%20table" title=" lock-free hash table"> lock-free hash table</a>, <a href="https://publications.waset.org/abstracts/search?q=point%20queries" title=" point queries"> point queries</a>, <a href="https://publications.waset.org/abstracts/search?q=range%20queries" title=" range queries"> range queries</a>, <a href="https://publications.waset.org/abstracts/search?q=SAP%20ASE%20database" title=" SAP ASE database"> SAP ASE database</a> </p> <a href="https://publications.waset.org/abstracts/72665/improve-b-tree-indexs-performance-using-lock-free-hash-table" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/72665.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">286</span> </span> </div> </div> </div> </main> <footer> <div id="infolinks" class="pt-3 pb-2"> <div class="container"> <div style="background-color:#f5f5f5;" class="p-3"> <div class="row"> <div class="col-md-2"> <ul class="list-unstyled"> About <li><a href="https://waset.org/page/support">About Us</a></li> <li><a href="https://waset.org/page/support#legal-information">Legal</a></li> <li><a target="_blank" rel="nofollow" href="https://publications.waset.org/static/files/WASET-16th-foundational-anniversary.pdf">WASET celebrates its 16th foundational anniversary</a></li> </ul> </div> <div class="col-md-2"> <ul class="list-unstyled"> Account <li><a href="https://waset.org/profile">My Account</a></li> </ul> </div> <div 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Search results for: Zhengwei She