Performance Enhancement with Federation and Parallel Query
A Study on the Role of Equivalence Rules in the Enhancement of Query Performance
... queries. Query Processing is concerned with execution of query or refers to the activities involved in extracting data from a data warehouse [1, ...a query expressed in a high-level language such as ...
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Performance comparison of query evaluation techniques in parallel text retrieval systems
... the query id and the subset of the query terms residing on that index ...improve performance of ABC-Server system, communication volume is decreased by performing accumulator size re- striction on ...
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Parallel query evaluation on multicore architectures
... using performance counters as a ...hardware performance counters and of the accuracy of these counters when profiling small segments of ...various performance counters for you, which does save the ...
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Dynamic Query Scheduling in Parallel Data Warehouses
... the parallel processing of star schema fact tables with associated bitmap ...a query is disk-bound or CPU-bound, which can be difficult to determine especially under skew ...worse performance but ...
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An Effective Parallel XML Fuzzy Query Processing
... a query processing model could coupled with fuzzy logic in XML database ...fuzzy query language is based on ...in query part. For improving the performance of X-PATH, we are using ...
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Dynamic Query Scheduling in Parallel Data Warehouses
... Scheduling. Presuming full parallelism for the large queries we examine, we are left with the task of allocating subqueries to processors and timing their execution. We con- sider this scheduling step particularly ...
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Parallel SPARQL Query Execution using Apache Spark
... 5.4 Performance Evaluation and Evaluation Metrics We are interested in measuring the query response time on the queries related to ...During query performance we also kept in mind regarding ...
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Parallel Query Evaluation and Indexing in Scientific Data Storage
... of parallel bitmap index generation, which resulted in FastQuery, writes the produced bitmaps from different cores into a single HDF5 ...I/O performance [7], parallel bitmap index generation strategy ...
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Understanding Query Performance in Accumulo
... 4. Query 1 ...each parallel client will receive entries from all 8 tablet ...that Query 1 is bound primarily by the ability of the clients to receive entries from the network and de-serialize the ...
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AT-GIS: highly parallel spatial query processing with associative transducers
... More recently, simultaneous finite automata (SFA) [56] perform a static construction to improve performance at the expense of a potentially expensive compilation. The result is near-linear scaling, albeit on a ...
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Subgraph Querying with Parallel Use of Query Rewritings and Alternative Algorithms
... overall performance, (ii) the dramat- ically varying performance of isomorphic queries, (iii) the impressive impact that query rewriting can have when used before executing the query with ...
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On Disk Allocation of Intermediate Query Results in Parallel Database Systems
... 3.1 Performance Indicators Since disks are normally shared by several nodes, the available degree of I/O parallel- ism cannot be measured simply by the number of disks a processor can access at a ...
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Scalable XML query processing using parallel pushdown transducers
... the performance of XPath query processors using a realistic query ...A query set and the first two queries from the B query ...through query rewriting, as described by Olteanu ...
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Blockchain Scalability Enhancement using Parallel Miners Selection
... III. A PROPOSED POTENTIAL SOLUTION FOR BLOCKCHAIN SCALABILITY Till here we are able to analyze that PoW based consensus protocol has two major shortcomings [13]. Consensus finality is the first out of these two ...
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Query Optimization for Database Federation Systems
... database federation with efficiently considering run-time ...database federation as clustered system, and provide each cluster of data sources with its cluster ...the query optimization can be ...
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Skew in Parallel Query Processing
... residual query q x is obtained from q by simply removing the variables ...main query on the subset of the database that consists of light hitters, then handling each heavy hitter separately, by computing a ...
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Communication Steps for Parallel Query Processing
... We consider the problem of computing a relational query q on a large input database of size n, using a large number p of servers. The computation is performed in rounds, and each server can receive only O(n/p 1−ε ...
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A journey to Semantic Web query federation in the life sciences
... a query endpoint was created from which to issue a query by identifying and locally aggregating the data sources necessary to answer the scientific question associated with our use case into a data ...makes ...
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Efficient Query Optimization for Distributed Join in Database Federation
... database federation as clustered system, and provide each cluster of data sources with its cluster ...the query optimization can be divided into two procedures: the global optimizer decides inter- cluster ...
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Parallel System Used By Query Optimization for Crowdsourcing
... the query is the biggest problem now days for crowdsourcing ...SQL query and the system takes the responsible for compiling the query, generating the execution plan and evaluating in the ...
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