Zobrazeno 1 - 10
of 794
pro vyhledávání: '"query plan"'
Publikováno v:
Mathematics, Vol 12, Iss 19, p 3102 (2024)
Over the last decades, various cost-based optimizers have been proposed to generate optimal plans for SQL queries. These optimizers are key to achieving good performance in database systems and can speed up query execution. Still, they may need enorm
Externí odkaz:
https://doaj.org/article/e86ef23f4fa645afadd0c3cf462da057
Autor:
WANG Run-an, ZOU Zhao-nian
Publikováno v:
Jisuanji kexue, Vol 49, Iss 8, Pp 49-55 (2022)
Query performance prediction (QPP) is an important issue in database systems.When there are concurrent transactions in a database system,the existing methods fail to establish an accurate model without changing query performance.In this paper,a new m
Externí odkaz:
https://doaj.org/article/3f4ee54b07c8402197f258423866ec33
Akademický článek
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Publikováno v:
Information, Vol 14, Iss 3, p 173 (2023)
A temporal model describes processes as a sequence of observable events characterised by distinguishable actions in time. Conformance checking allows these models to determine whether any sequence of temporally ordered and fully-observable events com
Externí odkaz:
https://doaj.org/article/506eb6ed1b944f82bad68078567629a3
Akademický článek
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Publikováno v:
Symmetry, Vol 14, Iss 1, p 55 (2022)
With database management systems becoming complex, predicting the execution time of graph queries before they are executed is one of the challenges for query scheduling, workload management, resource allocation, and progress monitoring. Through the c
Externí odkaz:
https://doaj.org/article/0881570387fb46f9a6322becdcdfc24d
In a traditional relational database management system, queries can only be defined over attributes defined in the schema, but are guaranteed to give single, definitive answer structured exactly as specified in the query. In contrast, an information
Externí odkaz:
https://tud.qucosa.de/id/qucosa%3A86494
https://tud.qucosa.de/api/qucosa%3A86494/attachment/ATT-0/
https://tud.qucosa.de/api/qucosa%3A86494/attachment/ATT-0/
Publikováno v:
IEEE Transactions on Knowledge and Data Engineering. 34:1133-1148
We study efficient regular expression (regex) matching problem. Existing algorithms are scanning-based algorithms which typically use an equivalent automaton compiled from the regex query to verify a document. Although some works propose various stra
Autor:
Arash Sharifi, Mehmet Unal, Elham Azhir, Mehdi Hosseinzadeh, Nima Jafari Navimipour, Aso Mohammad Darwesh
Publikováno v:
Cluster Computing. 25:2021-2036
In the distributed database systems, the relations needed by a query can be kept in several locations. This process significantly increases potential corresponding Query Execution Plans (QEP’s) for a user query. Henceforth, in addition to the expen
Publikováno v:
Journal of Data, Information and Management. 3:271-279
Cloud computing services are provided over the internet such as computing, servers, storage, databases, networking, software, and many more. Then, customers get services from cloud providers and pay according to their usage. Nowadays, Database as a s