Engineering Aggregation Operators for Relational In-Memory Database Systems
نویسنده
چکیده
منابع مشابه
Memory Efficient Processing of DNA Sequences in Relational Main-Memory Database Systems
Pipeline breaking operators such as aggregations or joins require database systems to materialize intermediate results. In case that the database system exceeds main memory capacities due to large intermediate results, main-memory database systems experience a massive performance degradation due to paging or even abort queries. In our current research on efficiently analyzing DNA sequencing dat...
متن کاملA COGNITIVE STYLE AND AGGREGATION OPERATOR MODEL: A LINGUISTIC APPROACH FOR CLASSIFICATION AND SELECTION OF THE AGGREGATION OPERATORS
Aggregation operators (AOs) have been studied by many schol- ars. As many AOs are proposed, there is still lacking approach to classify the categories of AO, and to select the appropriate AO within the AO candidates. In this research, each AO can be regarded as a cognitive style or individual dierence. A Cognitive Style and Aggregation Operator (CSAO) model is pro- posed to analyze the mapping ...
متن کاملHesitant Fuzzy Linguistic Arithmetic Aggregation Operators in Multiple Attribute Decision Making
In this paper, we investigate the multiple attribute decision making (MADM) problem based on the arithmetic and geometric aggregation operators with hesitant fuzzy linguistic information. Then, motivated by the idea of traditional arithmetic operation, we have developed some aggregation operators for aggregating hesitant fuzzy linguistic information: hesitant fuzzy linguistic weighted average (...
متن کاملQuery Processing and Optimization in Modern Database Systems
Relational database management systems, which were designed decades ago, are still the dominant data processing platform. Large DRAM capacities and servers with many cores have fundamentally changed the hardware landscape. Traditional database systems were designed with very different hardware in mind and cannot exploit modern hardware effectively. This thesis focuses on the challenges posed by...
متن کاملAn evaluation of the performance of parallel database operators using Phoenix MapReduce
The database join operator is the most expensive operator of the relational algebra operators. Many highly efficient sequential and parallel operators exist, based on several core techniques: sort-merge, hash and nested-loops. We present the design and implementation of two parallel operators: an equi-join and a grouping aggregation. They utilise the emerging MapReduce paradigm, specifically a ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2016