Technical Perspective: Data distribution for fast joins
نویسندگان
چکیده
منابع مشابه
Fast Optimal Twig Joins
In XML search systems twig queries specify predicates on node values and on the structural relationships between nodes, and a key operation is to join individual query node matches into full twig matches. Linear time twig join algorithms exist, but many non-optimal algorithms with better average-case performance have been introduced recently. These use somewhat simpler data structures that are ...
متن کاملmodeling loss data by phase-type distribution
بیمه گران همیشه بابت خسارات بیمه نامه های تحت پوشش خود نگران بوده و روش هایی را جستجو می کنند که بتوانند داده های خسارات گذشته را با هدف اتخاذ یک تصمیم بهینه مدل بندی نمایند. در این پژوهش توزیع های فیزتایپ در مدل بندی داده های خسارات معرفی شده که شامل استنباط آماری مربوطه و استفاده از الگوریتم em در برآورد پارامترهای توزیع است. در پایان امکان استفاده از این توزیع در مدل بندی داده های گروه بندی ...
Approximate Joins for Relational Data
Krommydas, Ioannis, Evagelos, Georgia. MSc, Computer Science Department, University of Ioannina, Greece. June, 2008. Approximate Joins for Relational Data. Thesis Supervisor: Vassiliadis Panos. Relational databases often contain duplicate data entries. This may occur due to a variety of reasons, such as typographical errors, multiple conventions for recording database fields or other noise sour...
متن کاملTechnical Report: MapReduce-based Similarity Joins
Cloud enabled systems have become a crucial component to efficiently process and analyze massive amounts of data. One of the key data processing and analysis operations is the Similarity Join, which retrieves all data pairs whose distances are smaller than a predefined threshold ε. Even though multiple algorithms and implementation techniques have been proposed for Similarity Joins, very little...
متن کاملParallel Data Access for Multiway Rank Joins
Rank join operators perform a relational join among two or more relations, assign numeric scores to the join results based on the given scoring function and return K join results with the highest scores. The top-K join results are obtained by accessing a subset of data from the input relations. This paper addresses the problem of getting topK join results from two or more search services which ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Communications of the ACM
سال: 2017
ISSN: 0001-0782,1557-7317
DOI: 10.1145/3041061